diff --git a/.travis.yml b/.travis.yml
index 665b33716..751243fbe 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,6 +14,7 @@ script:
 - npm run packager
 - npm run tester
 - npm run extractor
+- npm run vscoder
 - npm run glossary:keymaker
 - npm run webber
 - npm run builder
diff --git a/package.json b/package.json
index 10736c25b..ddd6ee780 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "webber": "node ./scripts/web.js",
     "tester": "node ./scripts/tdd.js",
     "extractor": "node ./scripts/extract.js",
+    "vscoder": "node ./scripts/vscodegen.js",
     "packager": "node ./scripts/module.js",
     "localizer": "node ./scripts/localize.js",
     "test": "jest --verbose"
diff --git a/scripts/extract.js b/scripts/extract.js
index aab30cda0..0f6514fc0 100644
--- a/scripts/extract.js
+++ b/scripts/extract.js
@@ -90,5 +90,5 @@ let listingData = {
 fs.writeFileSync(path.join(OUTPUT_PATH, 'snippets.json'), JSON.stringify(completeData, null, 2));
 fs.writeFileSync(path.join(OUTPUT_PATH, 'snippetList.json'), JSON.stringify(listingData, null, 2));
 // Display messages and time
-console.log(`${chalk.green('SUCCESS!')} snippets.json and snippetsArchive.json files generated!`);
+console.log(`${chalk.green('SUCCESS!')} snippets.json and snippetList.json files generated!`);
 console.timeEnd('Extractor');
diff --git a/scripts/util.js b/scripts/util.js
index cf25b1ad9..f3808a8dc 100644
--- a/scripts/util.js
+++ b/scripts/util.js
@@ -131,7 +131,7 @@ const getCodeBlocks = str => {
   results = results.map(v => v.replace(/```js([\s\S]*?)```/g, '$1').trim());
   return {
     es6: results[0],
-    es5: babel.transformSync(results[0], { presets: ['@babel/preset-env'] }).code,
+    es5: babel.transformSync(results[0], { presets: ['@babel/preset-env'] }).code.replace('"use strict";\n\n',''),
     example: results[1]
   }
 };
diff --git a/scripts/vscodegen.js b/scripts/vscodegen.js
new file mode 100644
index 000000000..3a89490cc
--- /dev/null
+++ b/scripts/vscodegen.js
@@ -0,0 +1,33 @@
+/*
+  This is the VSCode generator script that generates the vscode_snippets/snippets.json file.
+  Run using `npm run vscoder`.
+*/
+// Load modules
+const fs = require('fs-extra');
+const path = require('path');
+const chalk = require('chalk');
+let snippetsData = require('../snippet_data/snippets.json');
+// Paths
+const OUTPUT_PATH = './vscode_snippets';
+console.time('VSCoder');
+// Read and format data
+let vscodeData = snippetsData.data.filter(v => !v.meta.archived ).reduce((acc,v) => {
+  acc[v.id] = {
+    prefix: `30s_${v.id}`,
+    body: v.attributes.codeBlocks.es6.replace(/\r/g,'').split('\n'),
+    description: v.attributes.text.slice(0, v.attributes.text.indexOf('\r\n\r\n'))
+  };
+  return acc;
+}, {});
+// Write data
+fs.writeFileSync(
+  path.join(OUTPUT_PATH, 'snippets.json'),
+  JSON.stringify(vscodeData, null, 2)
+);
+// Display messages and time
+console.log(
+  `${chalk.green(
+    'SUCCESS!'
+  )} vscode_snippets/snippets.json file generated!`
+);
+console.timeEnd('VSCoder');
\ No newline at end of file
diff --git a/snippet_data/snippetList.json b/snippet_data/snippetList.json
index eb4bbef82..1941e4704 100644
--- a/snippet_data/snippetList.json
+++ b/snippet_data/snippetList.json
@@ -897,7 +897,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "91e05fa632509c91fad4770339e0f8a4ffc5d0c3a90694f2fd59af2321cac9fb"
+        "hash": "9bbacd07c7a1d66b521b98d192f21964ab2cc33a6a62e18314d9dae5ec51a270"
       }
     },
     {
@@ -1118,7 +1118,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "683bb22450b09dc717ef83b36ffcc6729a48891fcc47bab587b389f232597563"
+        "hash": "50b2980119026b898646420c2dc3cf2f394f5162f1a336cf64bc8d0244e54f26"
       }
     },
     {
@@ -3289,7 +3289,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "12276cbe7dde6659e4ab67ed3fbe81ac57d1e7766b41dc879f946f226b7b76ab"
+        "hash": "6a7d303a9761c57b32f977b8068de4fd9bd9ea72167df268220d13250d1483e5"
       }
     },
     {
@@ -3661,7 +3661,7 @@
         "archived": false
       },
       "meta": {
-        "hash": "5aac190c69a2a7d42dd4f17caabe760270ac8c82b8b54b760d3d6b1de86362d7"
+        "hash": "7a8643d6d71023c773ccb63efe25e4c9fe0bdd976a8a8f76f6f6a0abb928eaf1"
       }
     },
     {
diff --git a/snippet_data/snippets.json b/snippet_data/snippets.json
index 787b4a287..dd8fc2ab5 100644
--- a/snippet_data/snippets.json
+++ b/snippet_data/snippets.json
@@ -8,7 +8,7 @@
         "text": "Returns `true` if the provided predicate function returns `true` for all elements in a collection, `false` otherwise.\r\n\r\nUse `Array.prototype.every()` to test if all elements in the collection return `true` based on `fn`.\r\nOmit the second argument, `fn`, to use `Boolean` as a default.",
         "codeBlocks": {
           "es6": "const all = (arr, fn = Boolean) => arr.every(fn);",
-          "es5": "\"use strict\";\n\nvar all = function all(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return arr.every(fn);\n};",
+          "es5": "var all = function all(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return arr.every(fn);\n};",
           "example": "all([4, 2, 3], x => x > 1); // true\r\nall([1, 2, 3]); // true"
         },
         "tags": [
@@ -30,7 +30,7 @@
         "text": "Check if all elements in an array are equal.\r\n\r\nUse `Array.prototype.every()` to check if all the elements of the array are the same as the first one.",
         "codeBlocks": {
           "es6": "const allEqual = arr => arr.every(val => val === arr[0]);",
-          "es5": "\"use strict\";\n\nvar allEqual = function allEqual(arr) {\n  return arr.every(function (val) {\n    return val === arr[0];\n  });\n};",
+          "es5": "var allEqual = function allEqual(arr) {\n  return arr.every(function (val) {\n    return val === arr[0];\n  });\n};",
           "example": "allEqual([1, 2, 3, 4, 5, 6]); // false\r\nallEqual([1, 1, 1, 1]); // true"
         },
         "tags": [
@@ -52,7 +52,7 @@
         "text": "Returns `true` if the provided predicate function returns `true` for at least one element in a collection, `false` otherwise.\r\n\r\nUse `Array.prototype.some()` to test if any elements in the collection return `true` based on `fn`.\r\nOmit the second argument, `fn`, to use `Boolean` as a default.",
         "codeBlocks": {
           "es6": "const any = (arr, fn = Boolean) => arr.some(fn);",
-          "es5": "\"use strict\";\n\nvar any = function any(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return arr.some(fn);\n};",
+          "es5": "var any = function any(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return arr.some(fn);\n};",
           "example": "any([0, 1, 2, 0], x => x >= 2); // true\r\nany([0, 0, 1, 0]); // true"
         },
         "tags": [
@@ -74,7 +74,7 @@
         "text": "Checks if two numbers are approximately equal to each other.\r\n\r\nUse `Math.abs()` to compare the absolute difference of the two values to `epsilon`.\r\nOmit the third parameter, `epsilon`, to use a default value of `0.001`.",
         "codeBlocks": {
           "es6": "const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;",
-          "es5": "\"use strict\";\n\nvar approximatelyEqual = function approximatelyEqual(v1, v2) {\n  var epsilon = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0.001;\n  return Math.abs(v1 - v2) < epsilon;\n};",
+          "es5": "var approximatelyEqual = function approximatelyEqual(v1, v2) {\n  var epsilon = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0.001;\n  return Math.abs(v1 - v2) < epsilon;\n};",
           "example": "approximatelyEqual(Math.PI / 2.0, 1.5708); // true"
         },
         "tags": [
@@ -95,7 +95,7 @@
         "text": "Converts a 2D array to a comma-separated values (CSV) string.\r\n\r\nUse `Array.prototype.map()` and `Array.prototype.join(delimiter)` to combine individual 1D arrays (rows) into strings.\r\nUse `Array.prototype.join('\\n')` to combine all rows into a CSV string, separating each row with a newline.\r\nOmit the second argument, `delimiter`, to use a default delimiter of `,`.",
         "codeBlocks": {
           "es6": "const arrayToCSV = (arr, delimiter = ',') =>\r\n  arr.map(v => v.map(x => `\"${x}\"`).join(delimiter)).join('\\n');",
-          "es5": "\"use strict\";\n\nvar arrayToCSV = function arrayToCSV(arr) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  return arr.map(function (v) {\n    return v.map(function (x) {\n      return \"\\\"\".concat(x, \"\\\"\");\n    }).join(delimiter);\n  }).join('\\n');\n};",
+          "es5": "var arrayToCSV = function arrayToCSV(arr) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  return arr.map(function (v) {\n    return v.map(function (x) {\n      return \"\\\"\".concat(x, \"\\\"\");\n    }).join(delimiter);\n  }).join('\\n');\n};",
           "example": "arrayToCSV([['a', 'b'], ['c', 'd']]); // '\"a\",\"b\"\\n\"c\",\"d\"'\r\narrayToCSV([['a', 'b'], ['c', 'd']], ';'); // '\"a\";\"b\"\\n\"c\";\"d\"'"
         },
         "tags": [
@@ -118,7 +118,7 @@
         "text": "Converts the given array elements into `<li>` tags and appends them to the list of the given id.\r\n\r\nUse `Array.prototype.map()`, `document.querySelector()`, and an anonymous inner closure to create a list of html tags.",
         "codeBlocks": {
           "es6": "const arrayToHtmlList = (arr, listID) =>\r\n  (el => (\r\n    (el = document.querySelector('#' + listID)),\r\n    (el.innerHTML += arr.map(item => `<li>${item}</li>`).join(''))\r\n  ))();",
-          "es5": "\"use strict\";\n\nvar arrayToHtmlList = function arrayToHtmlList(arr, listID) {\n  return function (el) {\n    return el = document.querySelector('#' + listID), el.innerHTML += arr.map(function (item) {\n      return \"<li>\".concat(item, \"</li>\");\n    }).join('');\n  }();\n};",
+          "es5": "var arrayToHtmlList = function arrayToHtmlList(arr, listID) {\n  return function (el) {\n    return el = document.querySelector('#' + listID), el.innerHTML += arr.map(function (item) {\n      return \"<li>\".concat(item, \"</li>\");\n    }).join('');\n  }();\n};",
           "example": "arrayToHtmlList(['item 1', 'item 2'], 'myListID');"
         },
         "tags": [
@@ -140,7 +140,7 @@
         "text": "Creates a function that accepts up to `n` arguments, ignoring any additional arguments.\r\n\r\nCall the provided function, `fn`, with up to `n` arguments, using `Array.prototype.slice(0,n)` and the spread operator (`...`).",
         "codeBlocks": {
           "es6": "const ary = (fn, n) => (...args) => fn(...args.slice(0, n));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar ary = function ary(fn, n) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(args.slice(0, n)));\n  };\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar ary = function ary(fn, n) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(args.slice(0, n)));\n  };\n};",
           "example": "const firstTwoMax = ary(Math.max, 2);\r\n[[2, 6, 'a'], [8, 4, 6], [10]].map(x => firstTwoMax(...x)); // [6, 8, 10]"
         },
         "tags": [
@@ -162,7 +162,7 @@
         "text": "Decodes a string of data which has been encoded using base-64 encoding.\r\n\r\nCreate a `Buffer` for the given string with base-64 encoding and use `Buffer.toString('binary')` to return the decoded string.",
         "codeBlocks": {
           "es6": "const atob = str => Buffer.from(str, 'base64').toString('binary');",
-          "es5": "\"use strict\";\n\nvar atob = function atob(str) {\n  return Buffer.from(str, 'base64').toString('binary');\n};",
+          "es5": "var atob = function atob(str) {\n  return Buffer.from(str, 'base64').toString('binary');\n};",
           "example": "atob('Zm9vYmFy'); // 'foobar'"
         },
         "tags": [
@@ -185,7 +185,7 @@
         "text": "Attempts to invoke a function with the provided arguments, returning either the result or the caught error object.\r\n\r\nUse a `try... catch` block to return either the result of the function or an appropriate error.",
         "codeBlocks": {
           "es6": "const attempt = (fn, ...args) => {\r\n  try {\r\n    return fn(...args);\r\n  } catch (e) {\r\n    return e instanceof Error ? e : new Error(e);\r\n  }\r\n};",
-          "es5": "\"use strict\";\n\nvar attempt = function attempt(fn) {\n  try {\n    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n      args[_key - 1] = arguments[_key];\n    }\n\n    return fn.apply(void 0, args);\n  } catch (e) {\n    return e instanceof Error ? e : new Error(e);\n  }\n};",
+          "es5": "var attempt = function attempt(fn) {\n  try {\n    for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n      args[_key - 1] = arguments[_key];\n    }\n\n    return fn.apply(void 0, args);\n  } catch (e) {\n    return e instanceof Error ? e : new Error(e);\n  }\n};",
           "example": "var elements = attempt(function(selector) {\r\n  return document.querySelectorAll(selector);\r\n}, '>_>');\r\nif (elements instanceof Error) elements = []; // elements = []"
         },
         "tags": [
@@ -206,7 +206,7 @@
         "text": "Returns the average of two or more numbers.\r\n\r\nUse `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`, divide by the `length` of the array.",
         "codeBlocks": {
           "es6": "const average = (...nums) => nums.reduce((acc, val) => acc + val, 0) / nums.length;",
-          "es5": "\"use strict\";\n\nvar average = function average() {\n  for (var _len = arguments.length, nums = new Array(_len), _key = 0; _key < _len; _key++) {\n    nums[_key] = arguments[_key];\n  }\n\n  return nums.reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / nums.length;\n};",
+          "es5": "var average = function average() {\n  for (var _len = arguments.length, nums = new Array(_len), _key = 0; _key < _len; _key++) {\n    nums[_key] = arguments[_key];\n  }\n\n  return nums.reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / nums.length;\n};",
           "example": "average(...[1, 2, 3]); // 2\r\naverage(1, 2, 3); // 2"
         },
         "tags": [
@@ -228,7 +228,7 @@
         "text": "Returns the average of an array, after mapping each element to a value using the provided function.\r\n\r\nUse `Array.prototype.map()` to map each element to the value returned by `fn`, `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`, divide by the `length` of the array.",
         "codeBlocks": {
           "es6": "const averageBy = (arr, fn) =>\r\n  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0) /\r\n  arr.length;",
-          "es5": "\"use strict\";\n\nvar averageBy = function averageBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / arr.length;\n};",
+          "es5": "var averageBy = function averageBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / arr.length;\n};",
           "example": "averageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 5\r\naverageBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 5"
         },
         "tags": [
@@ -251,7 +251,7 @@
         "text": "Splits values into two groups. If an element in `filter` is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.\r\n\r\nUse `Array.prototype.reduce()` and `Array.prototype.push()` to add elements to groups, based on `filter`.",
         "codeBlocks": {
           "es6": "const bifurcate = (arr, filter) =>\r\n  arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [[], []]);",
-          "es5": "\"use strict\";\n\nvar bifurcate = function bifurcate(arr, filter) {\n  return arr.reduce(function (acc, val, i) {\n    return acc[filter[i] ? 0 : 1].push(val), acc;\n  }, [[], []]);\n};",
+          "es5": "var bifurcate = function bifurcate(arr, filter) {\n  return arr.reduce(function (acc, val, i) {\n    return acc[filter[i] ? 0 : 1].push(val), acc;\n  }, [[], []]);\n};",
           "example": "bifurcate(['beep', 'boop', 'foo', 'bar'], [true, true, false, true]); // [ ['beep', 'boop', 'bar'], ['foo'] ]"
         },
         "tags": [
@@ -272,7 +272,7 @@
         "text": "Splits values into two groups according to a predicate function, which specifies which group an element in the input collection belongs to. If the predicate function returns a truthy value, the collection element belongs to the first group; otherwise, it belongs to the second group.\r\n\r\nUse `Array.prototype.reduce()` and `Array.prototype.push()` to add elements to groups, based on the value returned by `fn` for each element.",
         "codeBlocks": {
           "es6": "const bifurcateBy = (arr, fn) =>\r\n  arr.reduce((acc, val, i) => (acc[fn(val, i) ? 0 : 1].push(val), acc), [[], []]);",
-          "es5": "\"use strict\";\n\nvar bifurcateBy = function bifurcateBy(arr, fn) {\n  return arr.reduce(function (acc, val, i) {\n    return acc[fn(val, i) ? 0 : 1].push(val), acc;\n  }, [[], []]);\n};",
+          "es5": "var bifurcateBy = function bifurcateBy(arr, fn) {\n  return arr.reduce(function (acc, val, i) {\n    return acc[fn(val, i) ? 0 : 1].push(val), acc;\n  }, [[], []]);\n};",
           "example": "bifurcateBy(['beep', 'boop', 'foo', 'bar'], x => x[0] === 'b'); // [ ['beep', 'boop', 'bar'], ['foo'] ]"
         },
         "tags": [
@@ -294,7 +294,7 @@
         "text": "Creates a function that invokes `fn` with a given context, optionally adding any additional supplied parameters to the beginning of the arguments.\r\n\r\nReturn a `function` that uses `Function.prototype.apply()` to apply the given `context` to `fn`.\r\nUse `Array.prototype.concat()` to prepend any additional supplied parameters to the arguments.",
         "codeBlocks": {
           "es6": "const bind = (fn, context, ...boundArgs) => (...args) => fn.apply(context, [...boundArgs, ...args]);",
-          "es5": "\"use strict\";\n\nvar bind = function bind(fn, context) {\n  for (var _len = arguments.length, boundArgs = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    boundArgs[_key - 2] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(context, boundArgs.concat(args));\n  };\n};",
+          "es5": "var bind = function bind(fn, context) {\n  for (var _len = arguments.length, boundArgs = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    boundArgs[_key - 2] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(context, boundArgs.concat(args));\n  };\n};",
           "example": "function greet(greeting, punctuation) {\r\n  return greeting + ' ' + this.user + punctuation;\r\n}\r\nconst freddy = { user: 'fred' };\r\nconst freddyBound = bind(greet, freddy);\r\nconsole.log(freddyBound('hi', '!')); // 'hi fred!'"
         },
         "tags": [
@@ -316,7 +316,7 @@
         "text": "Binds methods of an object to the object itself, overwriting the existing method.\r\n\r\nUse `Array.prototype.forEach()` to return a `function` that uses `Function.prototype.apply()` to apply the given context (`obj`) to `fn` for each function specified.",
         "codeBlocks": {
           "es6": "const bindAll = (obj, ...fns) =>\r\n  fns.forEach(\r\n    fn => (\r\n      (f = obj[fn]),\r\n      (obj[fn] = function() {\r\n        return f.apply(obj);\r\n      })\r\n    )\r\n  );",
-          "es5": "\"use strict\";\n\nvar bindAll = function bindAll(obj) {\n  for (var _len = arguments.length, fns = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    fns[_key - 1] = arguments[_key];\n  }\n\n  return fns.forEach(function (fn) {\n    return f = obj[fn], obj[fn] = function () {\n      return f.apply(obj);\n    };\n  });\n};",
+          "es5": "var bindAll = function bindAll(obj) {\n  for (var _len = arguments.length, fns = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    fns[_key - 1] = arguments[_key];\n  }\n\n  return fns.forEach(function (fn) {\n    return f = obj[fn], obj[fn] = function () {\n      return f.apply(obj);\n    };\n  });\n};",
           "example": "var view = {\r\n  label: 'docs',\r\n  click: function() {\r\n    console.log('clicked ' + this.label);\r\n  }\r\n};\r\nbindAll(view, 'click');\r\njQuery(element).on('click', view.click); // Logs 'clicked docs' when clicked."
         },
         "tags": [
@@ -338,7 +338,7 @@
         "text": "Creates a function that invokes the method at a given key of an object, optionally adding any additional supplied parameters to the beginning of the arguments.\r\n\r\nReturn a `function` that uses `Function.prototype.apply()` to bind `context[fn]` to `context`.\r\nUse the spread operator (`...`) to prepend any additional supplied parameters to the arguments.",
         "codeBlocks": {
           "es6": "const bindKey = (context, fn, ...boundArgs) => (...args) =>\r\n  context[fn].apply(context, [...boundArgs, ...args]);",
-          "es5": "\"use strict\";\n\nvar bindKey = function bindKey(context, fn) {\n  for (var _len = arguments.length, boundArgs = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    boundArgs[_key - 2] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return context[fn].apply(context, boundArgs.concat(args));\n  };\n};",
+          "es5": "var bindKey = function bindKey(context, fn) {\n  for (var _len = arguments.length, boundArgs = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    boundArgs[_key - 2] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return context[fn].apply(context, boundArgs.concat(args));\n  };\n};",
           "example": "const freddy = {\r\n  user: 'fred',\r\n  greet: function(greeting, punctuation) {\r\n    return greeting + ' ' + this.user + punctuation;\r\n  }\r\n};\r\nconst freddyBound = bindKey(freddy, 'greet');\r\nconsole.log(freddyBound('hi', '!')); // 'hi fred!'"
         },
         "tags": [
@@ -360,7 +360,7 @@
         "text": "Evaluates the binomial coefficient of two integers `n` and `k`.\r\n\r\nUse `Number.isNaN()` to check if any of the two values is `NaN`.\r\nCheck if `k` is less than `0`, greater than or equal to `n`, equal to `1` or `n - 1` and return the appropriate result.\r\nCheck if `n - k` is less than `k` and switch their values accordingly.\r\nLoop from `2` through `k` and calculate the binomial coefficient.\r\nUse `Math.round()` to account for rounding errors in the calculation.",
         "codeBlocks": {
           "es6": "const binomialCoefficient = (n, k) => {\r\n  if (Number.isNaN(n) || Number.isNaN(k)) return NaN;\r\n  if (k < 0 || k > n) return 0;\r\n  if (k === 0 || k === n) return 1;\r\n  if (k === 1 || k === n - 1) return n;\r\n  if (n - k < k) k = n - k;\r\n  let res = n;\r\n  for (let j = 2; j <= k; j++) res *= (n - j + 1) / j;\r\n  return Math.round(res);\r\n};",
-          "es5": "\"use strict\";\n\nvar binomialCoefficient = function binomialCoefficient(n, k) {\n  if (Number.isNaN(n) || Number.isNaN(k)) return NaN;\n  if (k < 0 || k > n) return 0;\n  if (k === 0 || k === n) return 1;\n  if (k === 1 || k === n - 1) return n;\n  if (n - k < k) k = n - k;\n  var res = n;\n\n  for (var j = 2; j <= k; j++) {\n    res *= (n - j + 1) / j;\n  }\n\n  return Math.round(res);\n};",
+          "es5": "var binomialCoefficient = function binomialCoefficient(n, k) {\n  if (Number.isNaN(n) || Number.isNaN(k)) return NaN;\n  if (k < 0 || k > n) return 0;\n  if (k === 0 || k === n) return 1;\n  if (k === 1 || k === n - 1) return n;\n  if (n - k < k) k = n - k;\n  var res = n;\n\n  for (var j = 2; j <= k; j++) {\n    res *= (n - j + 1) / j;\n  }\n\n  return Math.round(res);\n};",
           "example": "binomialCoefficient(8, 2); // 28"
         },
         "tags": [
@@ -381,7 +381,7 @@
         "text": "Returns `true` if the bottom of the page is visible, `false` otherwise.\r\n\r\nUse `scrollY`, `scrollHeight` and `clientHeight` to determine if the bottom of the page is visible.",
         "codeBlocks": {
           "es6": "const bottomVisible = () =>\r\n  document.documentElement.clientHeight + window.scrollY >=\r\n  (document.documentElement.scrollHeight || document.documentElement.clientHeight);",
-          "es5": "\"use strict\";\n\nvar bottomVisible = function bottomVisible() {\n  return document.documentElement.clientHeight + window.scrollY >= (document.documentElement.scrollHeight || document.documentElement.clientHeight);\n};",
+          "es5": "var bottomVisible = function bottomVisible() {\n  return document.documentElement.clientHeight + window.scrollY >= (document.documentElement.scrollHeight || document.documentElement.clientHeight);\n};",
           "example": "bottomVisible(); // true"
         },
         "tags": [
@@ -402,7 +402,7 @@
         "text": "Creates a base-64 encoded ASCII string from a String object in which each character in the string is treated as a byte of binary data.\r\n\r\nCreate a `Buffer` for the given string with binary encoding and use `Buffer.toString('base64')` to return the encoded string.",
         "codeBlocks": {
           "es6": "const btoa = str => Buffer.from(str, 'binary').toString('base64');",
-          "es5": "\"use strict\";\n\nvar btoa = function btoa(str) {\n  return Buffer.from(str, 'binary').toString('base64');\n};",
+          "es5": "var btoa = function btoa(str) {\n  return Buffer.from(str, 'binary').toString('base64');\n};",
           "example": "btoa('foobar'); // 'Zm9vYmFy'"
         },
         "tags": [
@@ -425,7 +425,7 @@
         "text": "Returns the length of a string in bytes.\r\n\r\nConvert a given string to a [`Blob` Object](https://developer.mozilla.org/en-US/docs/Web/API/Blob) and find its `size`.",
         "codeBlocks": {
           "es6": "const byteSize = str => new Blob([str]).size;",
-          "es5": "\"use strict\";\n\nvar byteSize = function byteSize(str) {\n  return new Blob([str]).size;\n};",
+          "es5": "var byteSize = function byteSize(str) {\n  return new Blob([str]).size;\n};",
           "example": "byteSize('😀'); // 4\r\nbyteSize('Hello World'); // 11"
         },
         "tags": [
@@ -446,7 +446,7 @@
         "text": "Given a key and a set of arguments, call them when given a context. Primarily useful in composition.\r\n\r\nUse a closure to call a stored key with stored arguments.",
         "codeBlocks": {
           "es6": "const call = (key, ...args) => context => context[key](...args);",
-          "es5": "\"use strict\";\n\nvar call = function call(key) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return function (context) {\n    return context[key].apply(context, args);\n  };\n};",
+          "es5": "var call = function call(key) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return function (context) {\n    return context[key].apply(context, args);\n  };\n};",
           "example": "Promise.resolve([1, 2, 3])\n  .then(call('map', x => 2 * x))\n  .then(console.log); // [ 2, 4, 6 ]\nconst map = call.bind(null, 'map');\nPromise.resolve([1, 2, 3])\n  .then(map(x => 2 * x))\n  .then(console.log); // [ 2, 4, 6 ]"
         },
         "tags": [
@@ -468,7 +468,7 @@
         "text": "Capitalizes the first letter of a string.\r\n\r\nUse array destructuring and `String.prototype.toUpperCase()` to capitalize first letter, `...rest` to get array of characters after first letter and then `Array.prototype.join('')` to make it a string again.\r\nOmit the `lowerRest` parameter to keep the rest of the string intact, or set it to `true` to convert to lowercase.",
         "codeBlocks": {
           "es6": "const capitalize = ([first, ...rest], lowerRest = false) =>\r\n  first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join(''));",
-          "es5": "\"use strict\";\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar capitalize = function capitalize(_ref) {\n  var _ref2 = _toArray(_ref),\n      first = _ref2[0],\n      rest = _ref2.slice(1);\n\n  var lowerRest = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join(''));\n};",
+          "es5": "function _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar capitalize = function capitalize(_ref) {\n  var _ref2 = _toArray(_ref),\n      first = _ref2[0],\n      rest = _ref2.slice(1);\n\n  var lowerRest = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join(''));\n};",
           "example": "capitalize('fooBar'); // 'FooBar'\r\ncapitalize('fooBar', true); // 'Foobar'"
         },
         "tags": [
@@ -490,7 +490,7 @@
         "text": "Capitalizes the first letter of every word in a string.\r\n\r\nUse `String.prototype.replace()` to match the first character of each word and `String.prototype.toUpperCase()` to capitalize it.",
         "codeBlocks": {
           "es6": "const capitalizeEveryWord = str => str.replace(/\\b[a-z]/g, char => char.toUpperCase());",
-          "es5": "\"use strict\";\n\nvar capitalizeEveryWord = function capitalizeEveryWord(str) {\n  return str.replace(/\\b[a-z]/g, function (char) {\n    return char.toUpperCase();\n  });\n};",
+          "es5": "var capitalizeEveryWord = function capitalizeEveryWord(str) {\n  return str.replace(/\\b[a-z]/g, function (char) {\n    return char.toUpperCase();\n  });\n};",
           "example": "capitalizeEveryWord('hello world!'); // 'Hello World!'"
         },
         "tags": [
@@ -512,7 +512,7 @@
         "text": "Casts the provided value as an array if it's not one.\r\n\r\nUse `Array.prototype.isArray()` to determine if `val` is an array and return it as-is or encapsulated in an array accordingly.",
         "codeBlocks": {
           "es6": "const castArray = val => (Array.isArray(val) ? val : [val]);",
-          "es5": "\"use strict\";\n\nvar castArray = function castArray(val) {\n  return Array.isArray(val) ? val : [val];\n};",
+          "es5": "var castArray = function castArray(val) {\n  return Array.isArray(val) ? val : [val];\n};",
           "example": "castArray('foo'); // ['foo']\r\ncastArray([1]); // [1]"
         },
         "tags": [
@@ -535,7 +535,7 @@
         "text": "Chains asynchronous functions.\r\n\r\nLoop through an array of functions containing asynchronous events, calling `next` when each asynchronous event has completed.",
         "codeBlocks": {
           "es6": "const chainAsync = fns => {\r\n  let curr = 0;\r\n  const next = () => fns[curr++](next);\r\n  next();\r\n};",
-          "es5": "\"use strict\";\n\nvar chainAsync = function chainAsync(fns) {\n  var curr = 0;\n\n  var next = function next() {\n    return fns[curr++](next);\n  };\n\n  next();\n};",
+          "es5": "var chainAsync = function chainAsync(fns) {\n  var curr = 0;\n\n  var next = function next() {\n    return fns[curr++](next);\n  };\n\n  next();\n};",
           "example": "chainAsync([\r\n  next => {\r\n    console.log('0 seconds');\r\n    setTimeout(next, 1000);\r\n  },\r\n  next => {\r\n    console.log('1 second');\r\n  }\r\n]);"
         },
         "tags": [
@@ -556,7 +556,7 @@
         "text": "Chunks an array into smaller arrays of a specified size.\r\n\r\nUse `Array.from()` to create a new array, that fits the number of chunks that will be produced.\r\nUse `Array.prototype.slice()` to map each element of the new array to a chunk the length of `size`.\r\nIf the original array can't be split evenly, the final chunk will contain the remaining elements.",
         "codeBlocks": {
           "es6": "const chunk = (arr, size) =>\r\n  Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>\r\n    arr.slice(i * size, i * size + size)\r\n  );",
-          "es5": "\"use strict\";\n\nvar chunk = function chunk(arr, size) {\n  return Array.from({\n    length: Math.ceil(arr.length / size)\n  }, function (v, i) {\n    return arr.slice(i * size, i * size + size);\n  });\n};",
+          "es5": "var chunk = function chunk(arr, size) {\n  return Array.from({\n    length: Math.ceil(arr.length / size)\n  }, function (v, i) {\n    return arr.slice(i * size, i * size + size);\n  });\n};",
           "example": "chunk([1, 2, 3, 4, 5], 2); // [[1,2],[3,4],[5]]"
         },
         "tags": [
@@ -577,7 +577,7 @@
         "text": "Clamps `num` within the inclusive range specified by the boundary values `a` and `b`.\r\n\r\nIf `num` falls within the range, return `num`.\r\nOtherwise, return the nearest number in the range.",
         "codeBlocks": {
           "es6": "const clampNumber = (num, a, b) => Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));",
-          "es5": "\"use strict\";\n\nvar clampNumber = function clampNumber(num, a, b) {\n  return Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));\n};",
+          "es5": "var clampNumber = function clampNumber(num, a, b) {\n  return Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));\n};",
           "example": "clampNumber(2, 3, 5); // 3\r\nclampNumber(1, -1, -5); // -1"
         },
         "tags": [
@@ -598,7 +598,7 @@
         "text": "Clones a regular expression.\r\n\r\nUse `new RegExp()`, `RegExp.source` and `RegExp.flags` to clone the given regular expression.",
         "codeBlocks": {
           "es6": "const cloneRegExp = regExp => new RegExp(regExp.source, regExp.flags);",
-          "es5": "\"use strict\";\n\nvar cloneRegExp = function cloneRegExp(regExp) {\n  return new RegExp(regExp.source, regExp.flags);\n};",
+          "es5": "var cloneRegExp = function cloneRegExp(regExp) {\n  return new RegExp(regExp.source, regExp.flags);\n};",
           "example": "const regExp = /lorem ipsum/gi;\r\nconst regExp2 = cloneRegExp(regExp); // /lorem ipsum/gi"
         },
         "tags": [
@@ -620,7 +620,7 @@
         "text": "Returns the first non-null/undefined argument.\r\n\r\nUse `Array.prototype.find()` to return the first non `null`/`undefined` argument.",
         "codeBlocks": {
           "es6": "const coalesce = (...args) => args.find(_ => ![undefined, null].includes(_));",
-          "es5": "\"use strict\";\n\nvar coalesce = function coalesce() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.find(function (_) {\n    return ![undefined, null].includes(_);\n  });\n};",
+          "es5": "var coalesce = function coalesce() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.find(function (_) {\n    return ![undefined, null].includes(_);\n  });\n};",
           "example": "coalesce(null, undefined, '', NaN, 'Waldo'); // \"\""
         },
         "tags": [
@@ -641,7 +641,7 @@
         "text": "Returns a customized coalesce function that returns the first argument that returns `true` from the provided argument validation function.\r\n\r\nUse `Array.prototype.find()` to return the first argument that returns `true` from the provided argument validation function.",
         "codeBlocks": {
           "es6": "const coalesceFactory = valid => (...args) => args.find(valid);",
-          "es5": "\"use strict\";\n\nvar coalesceFactory = function coalesceFactory(valid) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return args.find(valid);\n  };\n};",
+          "es5": "var coalesceFactory = function coalesceFactory(valid) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return args.find(valid);\n  };\n};",
           "example": "const customCoalesce = coalesceFactory(_ => ![null, undefined, '', NaN].includes(_));\r\ncustomCoalesce(undefined, null, NaN, '', 'Waldo'); // \"Waldo\""
         },
         "tags": [
@@ -662,7 +662,7 @@
         "text": "Changes a function that accepts an array into a variadic function.\r\n\r\nGiven a function, return a closure that collects all inputs into an array-accepting function.",
         "codeBlocks": {
           "es6": "const collectInto = fn => (...args) => fn(args);",
-          "es5": "\"use strict\";\n\nvar collectInto = function collectInto(fn) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn(args);\n  };\n};",
+          "es5": "var collectInto = function collectInto(fn) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn(args);\n  };\n};",
           "example": "const Pall = collectInto(Promise.all.bind(Promise));\nlet p1 = Promise.resolve(1);\nlet p2 = Promise.resolve(2);\nlet p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));\nPall(p1, p2, p3).then(console.log); // [1, 2, 3] (after about 2 seconds)"
         },
         "tags": [
@@ -685,7 +685,7 @@
         "text": "Add special characters to text to print in color in the console (combined with `console.log()`).\r\n\r\nUse template literals and special characters to add the appropriate color code to the string output.\r\nFor background colors, add a special character that resets the background color at the end of the string.",
         "codeBlocks": {
           "es6": "const colorize = (...args) => ({\r\n  black: `\\x1b[30m${args.join(' ')}`,\r\n  red: `\\x1b[31m${args.join(' ')}`,\r\n  green: `\\x1b[32m${args.join(' ')}`,\r\n  yellow: `\\x1b[33m${args.join(' ')}`,\r\n  blue: `\\x1b[34m${args.join(' ')}`,\r\n  magenta: `\\x1b[35m${args.join(' ')}`,\r\n  cyan: `\\x1b[36m${args.join(' ')}`,\r\n  white: `\\x1b[37m${args.join(' ')}`,\r\n  bgBlack: `\\x1b[40m${args.join(' ')}\\x1b[0m`,\r\n  bgRed: `\\x1b[41m${args.join(' ')}\\x1b[0m`,\r\n  bgGreen: `\\x1b[42m${args.join(' ')}\\x1b[0m`,\r\n  bgYellow: `\\x1b[43m${args.join(' ')}\\x1b[0m`,\r\n  bgBlue: `\\x1b[44m${args.join(' ')}\\x1b[0m`,\r\n  bgMagenta: `\\x1b[45m${args.join(' ')}\\x1b[0m`,\r\n  bgCyan: `\\x1b[46m${args.join(' ')}\\x1b[0m`,\r\n  bgWhite: `\\x1b[47m${args.join(' ')}\\x1b[0m`\r\n});",
-          "es5": "\"use strict\";\n\nvar colorize = function colorize() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return {\n    black: \"\\x1B[30m\".concat(args.join(' ')),\n    red: \"\\x1B[31m\".concat(args.join(' ')),\n    green: \"\\x1B[32m\".concat(args.join(' ')),\n    yellow: \"\\x1B[33m\".concat(args.join(' ')),\n    blue: \"\\x1B[34m\".concat(args.join(' ')),\n    magenta: \"\\x1B[35m\".concat(args.join(' ')),\n    cyan: \"\\x1B[36m\".concat(args.join(' ')),\n    white: \"\\x1B[37m\".concat(args.join(' ')),\n    bgBlack: \"\\x1B[40m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgRed: \"\\x1B[41m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgGreen: \"\\x1B[42m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgYellow: \"\\x1B[43m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgBlue: \"\\x1B[44m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgMagenta: \"\\x1B[45m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgCyan: \"\\x1B[46m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgWhite: \"\\x1B[47m\".concat(args.join(' '), \"\\x1B[0m\")\n  };\n};",
+          "es5": "var colorize = function colorize() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return {\n    black: \"\\x1B[30m\".concat(args.join(' ')),\n    red: \"\\x1B[31m\".concat(args.join(' ')),\n    green: \"\\x1B[32m\".concat(args.join(' ')),\n    yellow: \"\\x1B[33m\".concat(args.join(' ')),\n    blue: \"\\x1B[34m\".concat(args.join(' ')),\n    magenta: \"\\x1B[35m\".concat(args.join(' ')),\n    cyan: \"\\x1B[36m\".concat(args.join(' ')),\n    white: \"\\x1B[37m\".concat(args.join(' ')),\n    bgBlack: \"\\x1B[40m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgRed: \"\\x1B[41m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgGreen: \"\\x1B[42m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgYellow: \"\\x1B[43m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgBlue: \"\\x1B[44m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgMagenta: \"\\x1B[45m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgCyan: \"\\x1B[46m\".concat(args.join(' '), \"\\x1B[0m\"),\n    bgWhite: \"\\x1B[47m\".concat(args.join(' '), \"\\x1B[0m\")\n  };\n};",
           "example": "console.log(colorize('foo').red); // 'foo' (red letters)\r\nconsole.log(colorize('foo', 'bar').bgBlue); // 'foo bar' (blue background)\r\nconsole.log(colorize(colorize('foo').yellow, colorize('foo').green).bgWhite); // 'foo bar' (first word in yellow letters, second word in green letters, white background for both)"
         },
         "tags": [
@@ -708,7 +708,7 @@
         "text": "Removes falsey values from an array.\r\n\r\nUse `Array.prototype.filter()` to filter out falsey values (`false`, `null`, `0`, `\"\"`, `undefined`, and `NaN`).",
         "codeBlocks": {
           "es6": "const compact = arr => arr.filter(Boolean);",
-          "es5": "\"use strict\";\n\nvar compact = function compact(arr) {\n  return arr.filter(Boolean);\n};",
+          "es5": "var compact = function compact(arr) {\n  return arr.filter(Boolean);\n};",
           "example": "compact([0, 1, false, 2, '', 3, 'a', 'e' * 23, NaN, 's', 34]); // [ 1, 2, 3, 'a', 's', 34 ]"
         },
         "tags": [
@@ -729,7 +729,7 @@
         "text": "Performs right-to-left function composition.\r\n\r\nUse `Array.prototype.reduce()` to perform right-to-left function composition.\r\nThe last (rightmost) function can accept one or more arguments; the remaining functions must be unary.",
         "codeBlocks": {
           "es6": "const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));",
-          "es5": "\"use strict\";\n\nvar compose = function compose() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return f(g.apply(void 0, arguments));\n    };\n  });\n};",
+          "es5": "var compose = function compose() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return f(g.apply(void 0, arguments));\n    };\n  });\n};",
           "example": "const add5 = x => x + 5;\r\nconst multiply = (x, y) => x * y;\r\nconst multiplyAndAdd5 = compose(\r\n  add5,\r\n  multiply\r\n);\r\nmultiplyAndAdd5(5, 2); // 15"
         },
         "tags": [
@@ -750,7 +750,7 @@
         "text": "Performs left-to-right function composition.\r\n\r\nUse `Array.prototype.reduce()` to perform left-to-right function composition.\r\nThe first (leftmost) function can accept one or more arguments; the remaining functions must be unary.",
         "codeBlocks": {
           "es6": "const composeRight = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));",
-          "es5": "\"use strict\";\n\nvar composeRight = function composeRight() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return g(f.apply(void 0, arguments));\n    };\n  });\n};",
+          "es5": "var composeRight = function composeRight() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return g(f.apply(void 0, arguments));\n    };\n  });\n};",
           "example": "const add = (x, y) => x + y;\r\nconst square = x => x * x;\r\nconst addAndSquare = composeRight(add, square);\r\naddAndSquare(1, 2); // 9"
         },
         "tags": [
@@ -771,7 +771,7 @@
         "text": "Accepts a converging function and a list of branching functions and returns a function that applies each branching function to the arguments and the results of the branching functions are passed as arguments to the converging function.\r\n\r\nUse `Array.prototype.map()` and `Function.prototype.apply()` to apply each function to the given arguments.\r\nUse the spread operator (`...`) to call `coverger` with the results of all other functions.",
         "codeBlocks": {
           "es6": "const converge = (converger, fns) => (...args) => converger(...fns.map(fn => fn.apply(null, args)));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar converge = function converge(converger, fns) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return converger.apply(void 0, _toConsumableArray(fns.map(function (fn) {\n      return fn.apply(null, args);\n    })));\n  };\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar converge = function converge(converger, fns) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return converger.apply(void 0, _toConsumableArray(fns.map(function (fn) {\n      return fn.apply(null, args);\n    })));\n  };\n};",
           "example": "const average = converge((a, b) => a / b, [\r\n  arr => arr.reduce((a, v) => a + v, 0),\r\n  arr => arr.length\r\n]);\r\naverage([1, 2, 3, 4, 5, 6, 7]); // 4"
         },
         "tags": [
@@ -792,7 +792,7 @@
         "text": "⚠️ **NOTICE:** The same functionality can be easily implemented by using the new asynchronous Clipboard API, which is still experimental but should be used in the future instead of this snippet. Find out more about it [here](https://github.com/w3c/clipboard-apis/blob/master/explainer.adoc#writing-to-the-clipboard).\r\n\r\nCopy a string to the clipboard. \r\nOnly works as a result of user action (i.e. inside a `click` event listener).\r\n\r\nCreate a new `<textarea>` element, fill it with the supplied data and add it to the HTML document.\r\nUse `Selection.getRangeAt()`to store the selected range (if any).\r\nUse `document.execCommand('copy')` to copy to the clipboard.\r\nRemove the `<textarea>` element from the HTML document.\r\nFinally, use `Selection().addRange()` to recover the original selected range (if any).",
         "codeBlocks": {
           "es6": "const copyToClipboard = str => {\r\n  const el = document.createElement('textarea');\r\n  el.value = str;\r\n  el.setAttribute('readonly', '');\r\n  el.style.position = 'absolute';\r\n  el.style.left = '-9999px';\r\n  document.body.appendChild(el);\r\n  const selected =\r\n    document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;\r\n  el.select();\r\n  document.execCommand('copy');\r\n  document.body.removeChild(el);\r\n  if (selected) {\r\n    document.getSelection().removeAllRanges();\r\n    document.getSelection().addRange(selected);\r\n  }\r\n};",
-          "es5": "\"use strict\";\n\nvar copyToClipboard = function copyToClipboard(str) {\n  var el = document.createElement('textarea');\n  el.value = str;\n  el.setAttribute('readonly', '');\n  el.style.position = 'absolute';\n  el.style.left = '-9999px';\n  document.body.appendChild(el);\n  var selected = document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;\n  el.select();\n  document.execCommand('copy');\n  document.body.removeChild(el);\n\n  if (selected) {\n    document.getSelection().removeAllRanges();\n    document.getSelection().addRange(selected);\n  }\n};",
+          "es5": "var copyToClipboard = function copyToClipboard(str) {\n  var el = document.createElement('textarea');\n  el.value = str;\n  el.setAttribute('readonly', '');\n  el.style.position = 'absolute';\n  el.style.left = '-9999px';\n  document.body.appendChild(el);\n  var selected = document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;\n  el.select();\n  document.execCommand('copy');\n  document.body.removeChild(el);\n\n  if (selected) {\n    document.getSelection().removeAllRanges();\n    document.getSelection().addRange(selected);\n  }\n};",
           "example": "copyToClipboard('Lorem ipsum'); // 'Lorem ipsum' copied to clipboard."
         },
         "tags": [
@@ -814,7 +814,7 @@
         "text": "Groups the elements of an array based on the given function and returns the count of elements in each group.\r\n\r\nUse `Array.prototype.map()` to map the values of an array to a function or property name.\r\nUse `Array.prototype.reduce()` to create an object, where the keys are produced from the mapped results.",
         "codeBlocks": {
           "es6": "const countBy = (arr, fn) =>\r\n  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => {\r\n    acc[val] = (acc[val] || 0) + 1;\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar countBy = function countBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    acc[val] = (acc[val] || 0) + 1;\n    return acc;\n  }, {});\n};",
+          "es5": "var countBy = function countBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    acc[val] = (acc[val] || 0) + 1;\n    return acc;\n  }, {});\n};",
           "example": "countBy([6.1, 4.2, 6.3], Math.floor); // {4: 1, 6: 2}\r\ncountBy(['one', 'two', 'three'], 'length'); // {3: 2, 5: 1}"
         },
         "tags": [
@@ -836,7 +836,7 @@
         "text": "Creates a counter with the specified range, step and duration for the specified selector.\r\n\r\nCheck if `step` has the proper sign and change it accordingly.\r\nUse `setInterval()` in combination with `Math.abs()` and `Math.floor()` to calculate the time between each new text draw.\r\nUse `document.querySelector().innerHTML` to update the value of the selected element.\r\nOmit the fourth parameter, `step`, to use a default step of `1`.\r\nOmit the fifth parameter, `duration`, to use a default duration of `2000`ms.",
         "codeBlocks": {
           "es6": "const counter = (selector, start, end, step = 1, duration = 2000) => {\r\n  let current = start,\r\n    _step = (end - start) * step < 0 ? -step : step,\r\n    timer = setInterval(() => {\r\n      current += _step;\r\n      document.querySelector(selector).innerHTML = current;\r\n      if (current >= end) document.querySelector(selector).innerHTML = end;\r\n      if (current >= end) clearInterval(timer);\r\n    }, Math.abs(Math.floor(duration / (end - start))));\r\n  return timer;\r\n};",
-          "es5": "\"use strict\";\n\nvar counter = function counter(selector, start, end) {\n  var step = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 1;\n  var duration = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 2000;\n\n  var current = start,\n      _step = (end - start) * step < 0 ? -step : step,\n      timer = setInterval(function () {\n    current += _step;\n    document.querySelector(selector).innerHTML = current;\n    if (current >= end) document.querySelector(selector).innerHTML = end;\n    if (current >= end) clearInterval(timer);\n  }, Math.abs(Math.floor(duration / (end - start))));\n\n  return timer;\n};",
+          "es5": "var counter = function counter(selector, start, end) {\n  var step = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 1;\n  var duration = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : 2000;\n\n  var current = start,\n      _step = (end - start) * step < 0 ? -step : step,\n      timer = setInterval(function () {\n    current += _step;\n    document.querySelector(selector).innerHTML = current;\n    if (current >= end) document.querySelector(selector).innerHTML = end;\n    if (current >= end) clearInterval(timer);\n  }, Math.abs(Math.floor(duration / (end - start))));\n\n  return timer;\n};",
           "example": "counter('#my-id', 1, 1000, 5, 2000); // Creates a 2-second timer for the element with id=\"my-id\""
         },
         "tags": [
@@ -857,7 +857,7 @@
         "text": "Counts the occurrences of a value in an array.\r\n\r\nUse `Array.prototype.reduce()` to increment a counter each time you encounter the specific value inside the array.",
         "codeBlocks": {
           "es6": "const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);",
-          "es5": "\"use strict\";\n\nvar countOccurrences = function countOccurrences(arr, val) {\n  return arr.reduce(function (a, v) {\n    return v === val ? a + 1 : a;\n  }, 0);\n};",
+          "es5": "var countOccurrences = function countOccurrences(arr, val) {\n  return arr.reduce(function (a, v) {\n    return v === val ? a + 1 : a;\n  }, 0);\n};",
           "example": "countOccurrences([1, 1, 2, 1, 2, 3], 1); // 3"
         },
         "tags": [
@@ -878,7 +878,7 @@
         "text": "Creates an element from a string (without appending it to the document). \r\nIf the given string contains multiple elements, only the first one will be returned.\r\n\r\nUse `document.createElement()` to create a new element.\r\nSet its `innerHTML` to the string supplied as the argument. \r\nUse `ParentNode.firstElementChild` to return the element version of the string.",
         "codeBlocks": {
           "es6": "const createElement = str => {\r\n  const el = document.createElement('div');\r\n  el.innerHTML = str;\r\n  return el.firstElementChild;\r\n};",
-          "es5": "\"use strict\";\n\nvar createElement = function createElement(str) {\n  var el = document.createElement('div');\n  el.innerHTML = str;\n  return el.firstElementChild;\n};",
+          "es5": "var createElement = function createElement(str) {\n  var el = document.createElement('div');\n  el.innerHTML = str;\n  return el.firstElementChild;\n};",
           "example": "const el = createElement(\r\n  `<div class=\"container\">\r\n    <p>Hello!</p>\r\n  </div>`\r\n);\r\nconsole.log(el.className); // 'container'"
         },
         "tags": [
@@ -900,7 +900,7 @@
         "text": "Creates a pub/sub ([publish–subscribe](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern)) event hub with `emit`, `on`, and `off` methods.\r\n\r\nUse `Object.create(null)` to create an empty `hub` object that does not inherit properties from `Object.prototype`.\r\nFor `emit`, resolve the array of handlers based on the `event` argument and then run each one with `Array.prototype.forEach()` by passing in the data as an argument.\r\nFor `on`, create an array for the event if it does not yet exist, then use `Array.prototype.push()` to add the handler\r\nto the array.\r\nFor `off`, use `Array.prototype.findIndex()` to find the index of the handler in the event array and remove it using `Array.prototype.splice()`.",
         "codeBlocks": {
           "es6": "const createEventHub = () => ({\r\n  hub: Object.create(null),\r\n  emit(event, data) {\r\n    (this.hub[event] || []).forEach(handler => handler(data));\r\n  },\r\n  on(event, handler) {\r\n    if (!this.hub[event]) this.hub[event] = [];\r\n    this.hub[event].push(handler);\r\n  },\r\n  off(event, handler) {\r\n    const i = (this.hub[event] || []).findIndex(h => h === handler);\r\n    if (i > -1) this.hub[event].splice(i, 1);\r\n  }\r\n});",
-          "es5": "\"use strict\";\n\nvar createEventHub = function createEventHub() {\n  return {\n    hub: Object.create(null),\n    emit: function emit(event, data) {\n      (this.hub[event] || []).forEach(function (handler) {\n        return handler(data);\n      });\n    },\n    on: function on(event, handler) {\n      if (!this.hub[event]) this.hub[event] = [];\n      this.hub[event].push(handler);\n    },\n    off: function off(event, handler) {\n      var i = (this.hub[event] || []).findIndex(function (h) {\n        return h === handler;\n      });\n      if (i > -1) this.hub[event].splice(i, 1);\n    }\n  };\n};",
+          "es5": "var createEventHub = function createEventHub() {\n  return {\n    hub: Object.create(null),\n    emit: function emit(event, data) {\n      (this.hub[event] || []).forEach(function (handler) {\n        return handler(data);\n      });\n    },\n    on: function on(event, handler) {\n      if (!this.hub[event]) this.hub[event] = [];\n      this.hub[event].push(handler);\n    },\n    off: function off(event, handler) {\n      var i = (this.hub[event] || []).findIndex(function (h) {\n        return h === handler;\n      });\n      if (i > -1) this.hub[event].splice(i, 1);\n    }\n  };\n};",
           "example": "const handler = data => console.log(data);\r\nconst hub = createEventHub();\r\nlet increment = 0;\r\n\r\n// Subscribe: listen for different types of events\r\nhub.on('message', handler);\r\nhub.on('message', () => console.log('Message event fired'));\r\nhub.on('increment', () => increment++);\r\n\r\n// Publish: emit events to invoke all handlers subscribed to them, passing the data to them as an argument\r\nhub.emit('message', 'hello world'); // logs 'hello world' and 'Message event fired'\r\nhub.emit('message', { hello: 'world' }); // logs the object and 'Message event fired'\r\nhub.emit('increment'); // `increment` variable is now 1\r\n\r\n// Unsubscribe: stop a specific handler from listening to the 'message' event\r\nhub.off('message', handler);"
         },
         "tags": [
@@ -922,7 +922,7 @@
         "text": "Converts a comma-separated values (CSV) string to a 2D array.\r\n\r\nUse `Array.prototype.slice()` and `Array.prototype.indexOf('\\n')` to remove the first row (title row) if `omitFirstRow` is `true`.\r\nUse `String.prototype.split('\\n')` to create a string for each row, then `String.prototype.split(delimiter)` to separate the values in each row.\r\nOmit the second argument, `delimiter`, to use a default delimiter of `,`.\r\nOmit the third argument, `omitFirstRow`, to include the first row (title row) of the CSV string.",
         "codeBlocks": {
           "es6": "const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>\r\n  data\r\n    .slice(omitFirstRow ? data.indexOf('\\n') + 1 : 0)\r\n    .split('\\n')\r\n    .map(v => v.split(delimiter));",
-          "es5": "\"use strict\";\n\nvar CSVToArray = function CSVToArray(data) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var omitFirstRow = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;\n  return data.slice(omitFirstRow ? data.indexOf('\\n') + 1 : 0).split('\\n').map(function (v) {\n    return v.split(delimiter);\n  });\n};",
+          "es5": "var CSVToArray = function CSVToArray(data) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var omitFirstRow = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;\n  return data.slice(omitFirstRow ? data.indexOf('\\n') + 1 : 0).split('\\n').map(function (v) {\n    return v.split(delimiter);\n  });\n};",
           "example": "CSVToArray('a,b\\nc,d'); // [['a','b'],['c','d']];\r\nCSVToArray('a;b\\nc;d', ';'); // [['a','b'],['c','d']];\r\nCSVToArray('col1,col2\\na,b\\nc,d', ',', true); // [['a','b'],['c','d']];"
         },
         "tags": [
@@ -945,7 +945,7 @@
         "text": "Converts a comma-separated values (CSV) string to a 2D array of objects.\r\nThe first row of the string is used as the title row.\r\n\r\nUse `Array.prototype.slice()` and `Array.prototype.indexOf('\\n')` and `String.prototype.split(delimiter)` to separate the first row (title row) into values.\r\nUse `String.prototype.split('\\n')` to create a string for each row, then `Array.prototype.map()` and `String.prototype.split(delimiter)` to separate the values in each row.\r\nUse `Array.prototype.reduce()` to create an object for each row's values, with the keys parsed from the title row.\r\nOmit the second argument, `delimiter`, to use a default delimiter of `,`.",
         "codeBlocks": {
           "es6": "const CSVToJSON = (data, delimiter = ',') => {\r\n  const titles = data.slice(0, data.indexOf('\\n')).split(delimiter);\r\n  return data\r\n    .slice(data.indexOf('\\n') + 1)\r\n    .split('\\n')\r\n    .map(v => {\r\n      const values = v.split(delimiter);\r\n      return titles.reduce((obj, title, index) => ((obj[title] = values[index]), obj), {});\r\n    });\r\n};",
-          "es5": "\"use strict\";\n\nvar CSVToJSON = function CSVToJSON(data) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var titles = data.slice(0, data.indexOf('\\n')).split(delimiter);\n  return data.slice(data.indexOf('\\n') + 1).split('\\n').map(function (v) {\n    var values = v.split(delimiter);\n    return titles.reduce(function (obj, title, index) {\n      return obj[title] = values[index], obj;\n    }, {});\n  });\n};",
+          "es5": "var CSVToJSON = function CSVToJSON(data) {\n  var delimiter = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var titles = data.slice(0, data.indexOf('\\n')).split(delimiter);\n  return data.slice(data.indexOf('\\n') + 1).split('\\n').map(function (v) {\n    var values = v.split(delimiter);\n    return titles.reduce(function (obj, title, index) {\n      return obj[title] = values[index], obj;\n    }, {});\n  });\n};",
           "example": "CSVToJSON('col1,col2\\na,b\\nc,d'); // [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];\r\nCSVToJSON('col1;col2\\na;b\\nc;d', ';'); // [{'col1': 'a', 'col2': 'b'}, {'col1': 'c', 'col2': 'd'}];"
         },
         "tags": [
@@ -968,7 +968,7 @@
         "text": "Returns the current URL.\r\n\r\nUse `window.location.href` to get current URL.",
         "codeBlocks": {
           "es6": "const currentURL = () => window.location.href;",
-          "es5": "\"use strict\";\n\nvar currentURL = function currentURL() {\n  return window.location.href;\n};",
+          "es5": "var currentURL = function currentURL() {\n  return window.location.href;\n};",
           "example": "currentURL(); // 'https://google.com'"
         },
         "tags": [
@@ -990,7 +990,7 @@
         "text": "Curries a function.\r\n\r\nUse recursion.\r\nIf the number of provided arguments (`args`) is sufficient, call the passed function `fn`.\r\nOtherwise, return a curried function `fn` that expects the rest of the arguments.\r\nIf you want to curry a function that accepts a variable number of arguments (a variadic function, e.g. `Math.min()`), you can optionally pass the number of arguments to the second parameter `arity`.",
         "codeBlocks": {
           "es6": "const curry = (fn, arity = fn.length, ...args) =>\r\n  arity <= args.length ? fn(...args) : curry.bind(null, fn, arity, ...args);",
-          "es5": "\"use strict\";\n\nvar curry = function curry(fn) {\n  var arity = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : fn.length;\n\n  for (var _len = arguments.length, args = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    args[_key - 2] = arguments[_key];\n  }\n\n  return arity <= args.length ? fn.apply(void 0, args) : curry.bind.apply(curry, [null, fn, arity].concat(args));\n};",
+          "es5": "var curry = function curry(fn) {\n  var arity = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : fn.length;\n\n  for (var _len = arguments.length, args = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    args[_key - 2] = arguments[_key];\n  }\n\n  return arity <= args.length ? fn.apply(void 0, args) : curry.bind.apply(curry, [null, fn, arity].concat(args));\n};",
           "example": "curry(Math.pow)(2)(10); // 1024\r\ncurry(Math.min, 3)(10)(50)(2); // 2"
         },
         "tags": [
@@ -1012,7 +1012,7 @@
         "text": "Gets the day of the year from a `Date` object.\r\n\r\nUse `new Date()` and `Date.prototype.getFullYear()` to get the first day of the year as a `Date` object, subtract it from the provided `date` and divide with the milliseconds in each day to get the result.\r\nUse `Math.floor()` to appropriately round the resulting day count to an integer.",
         "codeBlocks": {
           "es6": "const dayOfYear = date =>\r\n  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);",
-          "es5": "\"use strict\";\n\nvar dayOfYear = function dayOfYear(date) {\n  return Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);\n};",
+          "es5": "var dayOfYear = function dayOfYear(date) {\n  return Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);\n};",
           "example": "dayOfYear(new Date()); // 272"
         },
         "tags": [
@@ -1033,7 +1033,7 @@
         "text": "Creates a debounced function that delays invoking the provided function until at least `ms` milliseconds have elapsed since the last time it was invoked.\r\n\r\nEach time the debounced function is invoked, clear the current pending timeout with `clearTimeout()` and use `setTimeout()` to create a new timeout that delays invoking the function until at least `ms` milliseconds has elapsed. Use `Function.prototype.apply()` to apply the `this` context to the function and provide the necessary arguments.\r\nOmit the second argument, `ms`, to set the timeout at a default of 0 ms.",
         "codeBlocks": {
           "es6": "const debounce = (fn, ms = 0) => {\r\n  let timeoutId;\r\n  return function(...args) {\r\n    clearTimeout(timeoutId);\r\n    timeoutId = setTimeout(() => fn.apply(this, args), ms);\r\n  };\r\n};",
-          "es5": "\"use strict\";\n\nvar debounce = function debounce(fn) {\n  var ms = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var timeoutId;\n  return function () {\n    var _this = this;\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    clearTimeout(timeoutId);\n    timeoutId = setTimeout(function () {\n      return fn.apply(_this, args);\n    }, ms);\n  };\n};",
+          "es5": "var debounce = function debounce(fn) {\n  var ms = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var timeoutId;\n  return function () {\n    var _this = this;\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    clearTimeout(timeoutId);\n    timeoutId = setTimeout(function () {\n      return fn.apply(_this, args);\n    }, ms);\n  };\n};",
           "example": "window.addEventListener(\r\n  'resize',\r\n  debounce(() => {\r\n    console.log(window.innerWidth);\r\n    console.log(window.innerHeight);\r\n  }, 250)\r\n); // Will log the window dimensions at most every 250ms"
         },
         "tags": [
@@ -1054,7 +1054,7 @@
         "text": "Decapitalizes the first letter of a string.\r\n\r\nUse array destructuring and `String.toLowerCase()` to decapitalize first letter, `...rest` to get array of characters after first letter and then `Array.prototype.join('')` to make it a string again.\r\nOmit the `upperRest` parameter to keep the rest of the string intact, or set it to `true` to convert to uppercase.",
         "codeBlocks": {
           "es6": "const decapitalize = ([first, ...rest], upperRest = false) =>\r\n  first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));",
-          "es5": "\"use strict\";\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar decapitalize = function decapitalize(_ref) {\n  var _ref2 = _toArray(_ref),\n      first = _ref2[0],\n      rest = _ref2.slice(1);\n\n  var upperRest = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));\n};",
+          "es5": "function _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar decapitalize = function decapitalize(_ref) {\n  var _ref2 = _toArray(_ref),\n      first = _ref2[0],\n      rest = _ref2.slice(1);\n\n  var upperRest = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));\n};",
           "example": "decapitalize('FooBar'); // 'fooBar'\r\ndecapitalize('FooBar', true); // 'fOOBAR'"
         },
         "tags": [
@@ -1076,7 +1076,7 @@
         "text": "Creates a deep clone of an object.\r\n\r\nUse recursion.\r\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.\r\nUse `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.",
         "codeBlocks": {
           "es6": "const deepClone = obj => {\r\n  let clone = Object.assign({}, obj);\r\n  Object.keys(clone).forEach(\r\n    key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])\r\n  );\r\n  return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : clone;\r\n};",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepClone = function deepClone(obj) {\n  var clone = Object.assign({}, obj);\n  Object.keys(clone).forEach(function (key) {\n    return clone[key] = _typeof(obj[key]) === 'object' ? deepClone(obj[key]) : obj[key];\n  });\n  return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : clone;\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar deepClone = function deepClone(obj) {\n  var clone = Object.assign({}, obj);\n  Object.keys(clone).forEach(function (key) {\n    return clone[key] = _typeof(obj[key]) === 'object' ? deepClone(obj[key]) : obj[key];\n  });\n  return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : clone;\n};",
           "example": "const a = { foo: 'bar', obj: { a: 1, b: 2 } };\r\nconst b = deepClone(a); // a !== b, a.obj !== b.obj"
         },
         "tags": [
@@ -1098,7 +1098,7 @@
         "text": "Deep flattens an array.\r\n\r\nUse recursion.\r\nUse `Array.prototype.concat()` with an empty array (`[]`) and the spread operator (`...`) to flatten an array.\r\nRecursively flatten each element that is an array.",
         "codeBlocks": {
           "es6": "const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar deepFlatten = function deepFlatten(arr) {\n  var _ref;\n\n  return (_ref = []).concat.apply(_ref, _toConsumableArray(arr.map(function (v) {\n    return Array.isArray(v) ? deepFlatten(v) : v;\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar deepFlatten = function deepFlatten(arr) {\n  var _ref;\n\n  return (_ref = []).concat.apply(_ref, _toConsumableArray(arr.map(function (v) {\n    return Array.isArray(v) ? deepFlatten(v) : v;\n  })));\n};",
           "example": "deepFlatten([1, [2], [[3], 4], 5]); // [1,2,3,4,5]"
         },
         "tags": [
@@ -1120,7 +1120,7 @@
         "text": "Deep freezes an object.\r\n\r\nCalls `Object.freeze(obj)` recursively on all unfrozen properties of passed object that are `instanceof` object.",
         "codeBlocks": {
           "es6": "const deepFreeze = obj =>\r\n  Object.keys(obj).forEach(\r\n    prop =>\r\n      !(obj[prop] instanceof Object) || Object.isFrozen(obj[prop]) ? null : deepFreeze(obj[prop])\r\n  ) || Object.freeze(obj);",
-          "es5": "\"use strict\";\n\nvar deepFreeze = function deepFreeze(obj) {\n  return Object.keys(obj).forEach(function (prop) {\n    return !(obj[prop] instanceof Object) || Object.isFrozen(obj[prop]) ? null : deepFreeze(obj[prop]);\n  }) || Object.freeze(obj);\n};",
+          "es5": "var deepFreeze = function deepFreeze(obj) {\n  return Object.keys(obj).forEach(function (prop) {\n    return !(obj[prop] instanceof Object) || Object.isFrozen(obj[prop]) ? null : deepFreeze(obj[prop]);\n  }) || Object.freeze(obj);\n};",
           "example": "'use strict';\r\n\r\nconst o = deepFreeze([1, [2, 3]]);\r\n\r\no[0] = 3; // not allowed\r\no[1][0] = 4; // not allowed as well"
         },
         "tags": [
@@ -1142,7 +1142,7 @@
         "text": "Assigns default values for all properties in an object that are `undefined`.\r\n\r\nUse `Object.assign()` to create a new empty object and copy the original one to maintain key order, use `Array.prototype.reverse()` and the spread operator `...` to combine the default values from left to right, finally use `obj` again to overwrite properties that originally had a value.",
         "codeBlocks": {
           "es6": "const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar defaults = function defaults(obj) {\n  for (var _len = arguments.length, defs = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    defs[_key - 1] = arguments[_key];\n  }\n\n  return Object.assign.apply(Object, [{}, obj].concat(_toConsumableArray(defs.reverse()), [obj]));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar defaults = function defaults(obj) {\n  for (var _len = arguments.length, defs = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    defs[_key - 1] = arguments[_key];\n  }\n\n  return Object.assign.apply(Object, [{}, obj].concat(_toConsumableArray(defs.reverse()), [obj]));\n};",
           "example": "defaults({ a: 1 }, { b: 2 }, { b: 6 }, { a: 3 }); // { a: 1, b: 2 }"
         },
         "tags": [
@@ -1163,7 +1163,7 @@
         "text": "Defers invoking a function until the current call stack has cleared.\r\n\r\nUse `setTimeout()` with a timeout of 1ms to add a new event to the browser event queue and allow the rendering engine to complete its work. Use the spread (`...`) operator to supply the function with an arbitrary number of arguments.",
         "codeBlocks": {
           "es6": "const defer = (fn, ...args) => setTimeout(fn, 1, ...args);",
-          "es5": "\"use strict\";\n\nvar defer = function defer(fn) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return setTimeout.apply(void 0, [fn, 1].concat(args));\n};",
+          "es5": "var defer = function defer(fn) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return setTimeout.apply(void 0, [fn, 1].concat(args));\n};",
           "example": "// Example A:\r\ndefer(console.log, 'a'), console.log('b'); // logs 'b' then 'a'\r\n\r\n// Example B:\r\ndocument.querySelector('#someElement').innerHTML = 'Hello';\r\nlongRunningFunction(); // Browser will not update the HTML until this has finished\r\ndefer(longRunningFunction); // Browser will update the HTML then run the function"
         },
         "tags": [
@@ -1184,7 +1184,7 @@
         "text": "Converts an angle from degrees to radians.\r\n\r\nUse `Math.PI` and the degree to radian formula to convert the angle from degrees to radians.",
         "codeBlocks": {
           "es6": "const degreesToRads = deg => (deg * Math.PI) / 180.0;",
-          "es5": "\"use strict\";\n\nvar degreesToRads = function degreesToRads(deg) {\n  return deg * Math.PI / 180.0;\n};",
+          "es5": "var degreesToRads = function degreesToRads(deg) {\n  return deg * Math.PI / 180.0;\n};",
           "example": "degreesToRads(90.0); // ~1.5708"
         },
         "tags": [
@@ -1205,7 +1205,7 @@
         "text": "Invokes the provided function after `wait` milliseconds.\r\n\r\nUse `setTimeout()` to delay execution of `fn`.\r\nUse the spread (`...`) operator to supply the function with an arbitrary number of arguments.",
         "codeBlocks": {
           "es6": "const delay = (fn, wait, ...args) => setTimeout(fn, wait, ...args);",
-          "es5": "\"use strict\";\n\nvar delay = function delay(fn, wait) {\n  for (var _len = arguments.length, args = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    args[_key - 2] = arguments[_key];\n  }\n\n  return setTimeout.apply(void 0, [fn, wait].concat(args));\n};",
+          "es5": "var delay = function delay(fn, wait) {\n  for (var _len = arguments.length, args = new Array(_len > 2 ? _len - 2 : 0), _key = 2; _key < _len; _key++) {\n    args[_key - 2] = arguments[_key];\n  }\n\n  return setTimeout.apply(void 0, [fn, wait].concat(args));\n};",
           "example": "delay(\r\n  function(text) {\r\n    console.log(text);\r\n  },\r\n  1000,\r\n  'later'\r\n); // Logs 'later' after one second."
         },
         "tags": [
@@ -1226,7 +1226,7 @@
         "text": "Detects wether the website is being opened in a mobile device or a desktop/laptop.\r\n\r\nUse a regular expression to test the `navigator.userAgent` property to figure out if the device is a mobile device or a desktop/laptop.",
         "codeBlocks": {
           "es6": "const detectDeviceType = () =>\r\n  /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)\r\n    ? 'Mobile'\r\n    : 'Desktop';",
-          "es5": "\"use strict\";\n\nvar detectDeviceType = function detectDeviceType() {\n  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ? 'Mobile' : 'Desktop';\n};",
+          "es5": "var detectDeviceType = function detectDeviceType() {\n  return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ? 'Mobile' : 'Desktop';\n};",
           "example": "detectDeviceType(); // \"Mobile\" or \"Desktop\""
         },
         "tags": [
@@ -1247,7 +1247,7 @@
         "text": "Returns the difference between two arrays.\r\n\r\nCreate a `Set` from `b`, then use `Array.prototype.filter()` on `a` to only keep values not contained in `b`.",
         "codeBlocks": {
           "es6": "const difference = (a, b) => {\r\n  const s = new Set(b);\r\n  return a.filter(x => !s.has(x));\r\n};",
-          "es5": "\"use strict\";\n\nvar difference = function difference(a, b) {\n  var s = new Set(b);\n  return a.filter(function (x) {\n    return !s.has(x);\n  });\n};",
+          "es5": "var difference = function difference(a, b) {\n  var s = new Set(b);\n  return a.filter(function (x) {\n    return !s.has(x);\n  });\n};",
           "example": "difference([1, 2, 3], [1, 2, 4]); // [3]"
         },
         "tags": [
@@ -1269,7 +1269,7 @@
         "text": "Returns the difference between two arrays, after applying the provided function to each array element of both.\r\n\r\nCreate a `Set` by applying `fn` to each element in `b`, then use `Array.prototype.filter()` in combination with `fn` on `a` to only keep values not contained in the previously created set.",
         "codeBlocks": {
           "es6": "const differenceBy = (a, b, fn) => {\r\n  const s = new Set(b.map(fn));\r\n  return a.filter(x => !s.has(fn(x)));\r\n};",
-          "es5": "\"use strict\";\n\nvar differenceBy = function differenceBy(a, b, fn) {\n  var s = new Set(b.map(fn));\n  return a.filter(function (x) {\n    return !s.has(fn(x));\n  });\n};",
+          "es5": "var differenceBy = function differenceBy(a, b, fn) {\n  var s = new Set(b.map(fn));\n  return a.filter(function (x) {\n    return !s.has(fn(x));\n  });\n};",
           "example": "differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor); // [1.2]\r\ndifferenceBy([{ x: 2 }, { x: 1 }], [{ x: 1 }], v => v.x); // [ { x: 2 } ]"
         },
         "tags": [
@@ -1291,7 +1291,7 @@
         "text": "Filters out all values from an array for which the comparator function does not return `true`.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.findIndex()` to find the appropriate values.",
         "codeBlocks": {
           "es6": "const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);",
-          "es5": "\"use strict\";\n\nvar differenceWith = function differenceWith(arr, val, comp) {\n  return arr.filter(function (a) {\n    return val.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  });\n};",
+          "es5": "var differenceWith = function differenceWith(arr, val, comp) {\n  return arr.filter(function (a) {\n    return val.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  });\n};",
           "example": "differenceWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0], (a, b) => Math.round(a) === Math.round(b)); // [1, 1.2]"
         },
         "tags": [
@@ -1312,8 +1312,8 @@
         "fileName": "dig.md",
         "text": "Returns the target value in a nested JSON object, based on the given key.\r\n\r\nUse the `in` operator to check if `target` exists in `obj`.\r\nIf found, return the value of `obj[target]`, otherwise use `Object.values(obj)` and `Array.prototype.reduce()` to recursively call `dig` on each nested object until the first matching key/value pair is found.",
         "codeBlocks": {
-          "es6": "const dig = (obj, target) =>\r\n  target in obj\r\n    ? obj[target]\r\n    : Object.values(obj).reduce((acc, val) => {\r\n        if (acc !== undefined) return acc;\r\n        if (typeof val === 'object') return dig(val, target);\r\n      }, undefined);",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar dig = function dig(obj, target) {\n  return target in obj ? obj[target] : Object.values(obj).reduce(function (acc, val) {\n    if (acc !== undefined) return acc;\n    if (_typeof(val) === 'object') return dig(val, target);\n  }, undefined);\n};",
+          "es6": "const dig = (obj, target) =>\r\n  target in obj\r\n    ? obj[target]\r\n    : Object.values(obj).reduce((acc, val) => {\r\n      if (acc !== undefined) return acc;\r\n      if (typeof val === 'object') return dig(val, target);\r\n    }, undefined);",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar dig = function dig(obj, target) {\n  return target in obj ? obj[target] : Object.values(obj).reduce(function (acc, val) {\n    if (acc !== undefined) return acc;\n    if (_typeof(val) === 'object') return dig(val, target);\n  }, undefined);\n};",
           "example": "const data = {\r\n  level1: {\r\n    level2: {\r\n      level3: 'some data'\r\n    }\r\n  }\r\n};\r\ndig(data, 'level3'); // 'some data'\r\ndig(data, 'level4'); // undefined"
         },
         "tags": [
@@ -1324,7 +1324,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "91e05fa632509c91fad4770339e0f8a4ffc5d0c3a90694f2fd59af2321cac9fb"
+        "hash": "9bbacd07c7a1d66b521b98d192f21964ab2cc33a6a62e18314d9dae5ec51a270"
       }
     },
     {
@@ -1335,7 +1335,7 @@
         "text": "Converts a number to an array of digits.\r\n\r\nConvert the number to a string, using the spread operator (`...`) to build an array.\r\nUse `Array.prototype.map()` and `parseInt()` to transform each value to an integer.",
         "codeBlocks": {
           "es6": "const digitize = n => [...`${n}`].map(i => parseInt(i));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar digitize = function digitize(n) {\n  return _toConsumableArray(\"\".concat(n)).map(function (i) {\n    return parseInt(i);\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar digitize = function digitize(n) {\n  return _toConsumableArray(\"\".concat(n)).map(function (i) {\n    return parseInt(i);\n  });\n};",
           "example": "digitize(123); // [1, 2, 3]"
         },
         "tags": [
@@ -1357,7 +1357,7 @@
         "text": "Returns the distance between two points.\r\n\r\nUse `Math.hypot()` to calculate the Euclidean distance between two points.",
         "codeBlocks": {
           "es6": "const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);",
-          "es5": "\"use strict\";\n\nvar distance = function distance(x0, y0, x1, y1) {\n  return Math.hypot(x1 - x0, y1 - y0);\n};",
+          "es5": "var distance = function distance(x0, y0, x1, y1) {\n  return Math.hypot(x1 - x0, y1 - y0);\n};",
           "example": "distance(1, 1, 2, 3); // 2.23606797749979"
         },
         "tags": [
@@ -1378,7 +1378,7 @@
         "text": "Returns a new array with `n` elements removed from the left.\r\n\r\nUse `Array.prototype.slice()` to slice the remove the specified number of elements from the left.",
         "codeBlocks": {
           "es6": "const drop = (arr, n = 1) => arr.slice(n);",
-          "es5": "\"use strict\";\n\nvar drop = function drop(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(n);\n};",
+          "es5": "var drop = function drop(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(n);\n};",
           "example": "drop([1, 2, 3]); // [2,3]\r\ndrop([1, 2, 3], 2); // [3]\r\ndrop([1, 2, 3], 42); // []"
         },
         "tags": [
@@ -1399,7 +1399,7 @@
         "text": "Returns a new array with `n` elements removed from the right.\r\n\r\nUse `Array.prototype.slice()` to slice the remove the specified number of elements from the right.",
         "codeBlocks": {
           "es6": "const dropRight = (arr, n = 1) => arr.slice(0, -n);",
-          "es5": "\"use strict\";\n\nvar dropRight = function dropRight(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(0, -n);\n};",
+          "es5": "var dropRight = function dropRight(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(0, -n);\n};",
           "example": "dropRight([1, 2, 3]); // [1,2]\r\ndropRight([1, 2, 3], 2); // [1]\r\ndropRight([1, 2, 3], 42); // []"
         },
         "tags": [
@@ -1420,7 +1420,7 @@
         "text": "Removes elements from the end of an array until the passed function returns `true`. Returns the remaining elements in the array.\r\n\r\nLoop through the array, using `Array.prototype.slice()` to drop the last element of the array until the returned value from the function is `true`.\r\nReturns the remaining elements.",
         "codeBlocks": {
           "es6": "const dropRightWhile = (arr, func) => {\r\n  while (arr.length > 0 && !func(arr[arr.length - 1])) arr = arr.slice(0, -1);\r\n  return arr;\r\n};",
-          "es5": "\"use strict\";\n\nvar dropRightWhile = function dropRightWhile(arr, func) {\n  while (arr.length > 0 && !func(arr[arr.length - 1])) {\n    arr = arr.slice(0, -1);\n  }\n\n  return arr;\n};",
+          "es5": "var dropRightWhile = function dropRightWhile(arr, func) {\n  while (arr.length > 0 && !func(arr[arr.length - 1])) {\n    arr = arr.slice(0, -1);\n  }\n\n  return arr;\n};",
           "example": "dropRightWhile([1, 2, 3, 4], n => n < 3); // [1, 2]"
         },
         "tags": [
@@ -1442,7 +1442,7 @@
         "text": "Removes elements in an array until the passed function returns `true`. Returns the remaining elements in the array.\r\n\r\nLoop through the array, using `Array.prototype.slice()` to drop the first element of the array until the returned value from the function is `true`.\r\nReturns the remaining elements.",
         "codeBlocks": {
           "es6": "const dropWhile = (arr, func) => {\r\n  while (arr.length > 0 && !func(arr[0])) arr = arr.slice(1);\r\n  return arr;\r\n};",
-          "es5": "\"use strict\";\n\nvar dropWhile = function dropWhile(arr, func) {\n  while (arr.length > 0 && !func(arr[0])) {\n    arr = arr.slice(1);\n  }\n\n  return arr;\n};",
+          "es5": "var dropWhile = function dropWhile(arr, func) {\n  while (arr.length > 0 && !func(arr[0])) {\n    arr = arr.slice(1);\n  }\n\n  return arr;\n};",
           "example": "dropWhile([1, 2, 3, 4], n => n >= 3); // [3,4]"
         },
         "tags": [
@@ -1464,7 +1464,7 @@
         "text": "Returns `true` if the `parent` element contains the `child` element, `false` otherwise.\r\n\r\nCheck that `parent` is not the same element as `child`, use `parent.contains(child)` to check if the `parent` element contains the `child` element.",
         "codeBlocks": {
           "es6": "const elementContains = (parent, child) => parent !== child && parent.contains(child);",
-          "es5": "\"use strict\";\n\nvar elementContains = function elementContains(parent, child) {\n  return parent !== child && parent.contains(child);\n};",
+          "es5": "var elementContains = function elementContains(parent, child) {\n  return parent !== child && parent.contains(child);\n};",
           "example": "elementContains(document.querySelector('head'), document.querySelector('title')); // true\r\nelementContains(document.querySelector('body'), document.querySelector('body')); // false"
         },
         "tags": [
@@ -1485,7 +1485,7 @@
         "text": "Returns `true` if the element specified is visible in the viewport, `false` otherwise.\r\n\r\nUse `Element.getBoundingClientRect()` and the `window.inner(Width|Height)` values\r\nto determine if a given element is visible in the viewport.\r\nOmit the second argument to determine if the element is entirely visible, or specify `true` to determine if\r\nit is partially visible.",
         "codeBlocks": {
           "es6": "const elementIsVisibleInViewport = (el, partiallyVisible = false) => {\r\n  const { top, left, bottom, right } = el.getBoundingClientRect();\r\n  const { innerHeight, innerWidth } = window;\r\n  return partiallyVisible\r\n    ? ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight)) &&\r\n        ((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth))\r\n    : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;\r\n};",
-          "es5": "\"use strict\";\n\nvar elementIsVisibleInViewport = function elementIsVisibleInViewport(el) {\n  var partiallyVisible = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var _el$getBoundingClient = el.getBoundingClientRect(),\n      top = _el$getBoundingClient.top,\n      left = _el$getBoundingClient.left,\n      bottom = _el$getBoundingClient.bottom,\n      right = _el$getBoundingClient.right;\n\n  var _window = window,\n      innerHeight = _window.innerHeight,\n      innerWidth = _window.innerWidth;\n  return partiallyVisible ? (top > 0 && top < innerHeight || bottom > 0 && bottom < innerHeight) && (left > 0 && left < innerWidth || right > 0 && right < innerWidth) : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;\n};",
+          "es5": "var elementIsVisibleInViewport = function elementIsVisibleInViewport(el) {\n  var partiallyVisible = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var _el$getBoundingClient = el.getBoundingClientRect(),\n      top = _el$getBoundingClient.top,\n      left = _el$getBoundingClient.left,\n      bottom = _el$getBoundingClient.bottom,\n      right = _el$getBoundingClient.right;\n\n  var _window = window,\n      innerHeight = _window.innerHeight,\n      innerWidth = _window.innerWidth;\n  return partiallyVisible ? (top > 0 && top < innerHeight || bottom > 0 && bottom < innerHeight) && (left > 0 && left < innerWidth || right > 0 && right < innerWidth) : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;\n};",
           "example": "// e.g. 100x100 viewport and a 10x10px element at position {top: -1, left: 0, bottom: 9, right: 10}\r\nelementIsVisibleInViewport(el); // false - (not fully visible)\r\nelementIsVisibleInViewport(el, true); // true - (partially visible)"
         },
         "tags": [
@@ -1506,7 +1506,7 @@
         "text": "Computes the new ratings between two or more opponents using the [Elo rating system](https://en.wikipedia.org/wiki/Elo_rating_system). It takes an array\r\nof pre-ratings and returns an array containing post-ratings.\r\nThe array should be ordered from best performer to worst performer (winner -> loser).\r\n\r\nUse the exponent `**` operator and math operators to compute the expected score (chance of winning).\r\nof each opponent and compute the new rating for each.\r\nLoop through the ratings, using each permutation to compute the post-Elo rating for each player in a pairwise fashion. \r\nOmit the second argument to use the default `kFactor` of 32.",
         "codeBlocks": {
           "es6": "const elo = ([...ratings], kFactor = 32, selfRating) => {\r\n  const [a, b] = ratings;\r\n  const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400));\r\n  const newRating = (rating, i) =>\r\n    (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));\r\n  if (ratings.length === 2) return [newRating(a, 1), newRating(b, 0)];\r\n\r\n  for (let i = 0, len = ratings.length; i < len; i++) {\r\n    let j = i;\r\n    while (j < len - 1) {\r\n      j++;\r\n      [ratings[i], ratings[j]] = elo([ratings[i], ratings[j]], kFactor);\r\n    }\r\n  }\r\n  return ratings;\r\n};",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar elo = function elo(_ref) {\n  var _ref2 = _toArray(_ref),\n      ratings = _ref2.slice(0);\n\n  var kFactor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 32;\n  var selfRating = arguments.length > 2 ? arguments[2] : undefined;\n\n  var _ratings = _slicedToArray(ratings, 2),\n      a = _ratings[0],\n      b = _ratings[1];\n\n  var expectedScore = function expectedScore(self, opponent) {\n    return 1 / (1 + Math.pow(10, (opponent - self) / 400));\n  };\n\n  var newRating = function newRating(rating, i) {\n    return (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));\n  };\n\n  if (ratings.length === 2) return [newRating(a, 1), newRating(b, 0)];\n\n  for (var i = 0, len = ratings.length; i < len; i++) {\n    var j = i;\n\n    while (j < len - 1) {\n      j++;\n\n      var _elo = elo([ratings[i], ratings[j]], kFactor);\n\n      var _elo2 = _slicedToArray(_elo, 2);\n\n      ratings[i] = _elo2[0];\n      ratings[j] = _elo2[1];\n    }\n  }\n\n  return ratings;\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar elo = function elo(_ref) {\n  var _ref2 = _toArray(_ref),\n      ratings = _ref2.slice(0);\n\n  var kFactor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 32;\n  var selfRating = arguments.length > 2 ? arguments[2] : undefined;\n\n  var _ratings = _slicedToArray(ratings, 2),\n      a = _ratings[0],\n      b = _ratings[1];\n\n  var expectedScore = function expectedScore(self, opponent) {\n    return 1 / (1 + Math.pow(10, (opponent - self) / 400));\n  };\n\n  var newRating = function newRating(rating, i) {\n    return (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));\n  };\n\n  if (ratings.length === 2) return [newRating(a, 1), newRating(b, 0)];\n\n  for (var i = 0, len = ratings.length; i < len; i++) {\n    var j = i;\n\n    while (j < len - 1) {\n      j++;\n\n      var _elo = elo([ratings[i], ratings[j]], kFactor);\n\n      var _elo2 = _slicedToArray(_elo, 2);\n\n      ratings[i] = _elo2[0];\n      ratings[j] = _elo2[1];\n    }\n  }\n\n  return ratings;\n};",
           "example": "// Standard 1v1s\r\nelo([1200, 1200]); // [1216, 1184]\r\nelo([1200, 1200], 64); // [1232, 1168]\r\n// 4 player FFA, all same rank\r\nelo([1200, 1200, 1200, 1200]).map(Math.round); // [1246, 1215, 1185, 1154]\r\n/*\r\nFor teams, each rating can adjusted based on own team's average rating vs.\r\naverage rating of opposing team, with the score being added to their\r\nown individual rating by supplying it as the third argument.\r\n*/"
         },
         "tags": [
@@ -1528,7 +1528,7 @@
         "text": "Performs a deep comparison between two values to determine if they are equivalent.\r\n\r\nCheck if the two values are identical, if they are both `Date` objects with the same time, using `Date.getTime()` or if they are both non-object values with an equivalent value (strict comparison).\r\nCheck if only one value is `null` or `undefined` or if their prototypes differ.\r\nIf none of the above conditions are met, use `Object.keys()` to check if both values have the same number of keys, then use `Array.prototype.every()` to check if every key in the first value exists in the second one and if they are equivalent by calling this method recursively.",
         "codeBlocks": {
           "es6": "const equals = (a, b) => {\r\n  if (a === b) return true;\r\n  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();\r\n  if (!a || !b || (typeof a !== 'object' && typeof b !== 'object')) return a === b;\r\n  if (a === null || a === undefined || b === null || b === undefined) return false;\r\n  if (a.prototype !== b.prototype) return false;\r\n  let keys = Object.keys(a);\r\n  if (keys.length !== Object.keys(b).length) return false;\r\n  return keys.every(k => equals(a[k], b[k]));\r\n};",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar equals = function equals(a, b) {\n  if (a === b) return true;\n  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();\n  if (!a || !b || _typeof(a) !== 'object' && _typeof(b) !== 'object') return a === b;\n  if (a === null || a === undefined || b === null || b === undefined) return false;\n  if (a.prototype !== b.prototype) return false;\n  var keys = Object.keys(a);\n  if (keys.length !== Object.keys(b).length) return false;\n  return keys.every(function (k) {\n    return equals(a[k], b[k]);\n  });\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar equals = function equals(a, b) {\n  if (a === b) return true;\n  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();\n  if (!a || !b || _typeof(a) !== 'object' && _typeof(b) !== 'object') return a === b;\n  if (a === null || a === undefined || b === null || b === undefined) return false;\n  if (a.prototype !== b.prototype) return false;\n  var keys = Object.keys(a);\n  if (keys.length !== Object.keys(b).length) return false;\n  return keys.every(function (k) {\n    return equals(a[k], b[k]);\n  });\n};",
           "example": "equals({ a: [2, { e: 3 }], b: [4], c: 'foo' }, { a: [2, { e: 3 }], b: [4], c: 'foo' }); // true"
         },
         "tags": [
@@ -1551,7 +1551,7 @@
         "text": "Escapes a string for use in HTML.\r\n\r\nUse `String.prototype.replace()` with a regexp that matches the characters that need to be escaped, using a callback function to replace each character instance with its associated escaped character using a dictionary (object).",
         "codeBlocks": {
           "es6": "const escapeHTML = str =>\r\n  str.replace(\r\n    /[&<>'\"]/g,\r\n    tag =>\r\n      ({\r\n        '&': '&amp;',\r\n        '<': '&lt;',\r\n        '>': '&gt;',\r\n        \"'\": '&#39;',\r\n        '\"': '&quot;'\r\n      }[tag] || tag)\r\n  );",
-          "es5": "\"use strict\";\n\nvar escapeHTML = function escapeHTML(str) {\n  return str.replace(/[&<>'\"]/g, function (tag) {\n    return {\n      '&': '&amp;',\n      '<': '&lt;',\n      '>': '&gt;',\n      \"'\": '&#39;',\n      '\"': '&quot;'\n    }[tag] || tag;\n  });\n};",
+          "es5": "var escapeHTML = function escapeHTML(str) {\n  return str.replace(/[&<>'\"]/g, function (tag) {\n    return {\n      '&': '&amp;',\n      '<': '&lt;',\n      '>': '&gt;',\n      \"'\": '&#39;',\n      '\"': '&quot;'\n    }[tag] || tag;\n  });\n};",
           "example": "escapeHTML('<a href=\"#\">Me & you</a>'); // '&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'"
         },
         "tags": [
@@ -1574,7 +1574,7 @@
         "text": "Escapes a string to use in a regular expression.\r\n\r\nUse `String.prototype.replace()` to escape special characters.",
         "codeBlocks": {
           "es6": "const escapeRegExp = str => str.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&');",
-          "es5": "\"use strict\";\n\nvar escapeRegExp = function escapeRegExp(str) {\n  return str.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&');\n};",
+          "es5": "var escapeRegExp = function escapeRegExp(str) {\n  return str.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&');\n};",
           "example": "escapeRegExp('(test)'); // \\\\(test\\\\)"
         },
         "tags": [
@@ -1596,7 +1596,7 @@
         "text": "Returns every nth element in an array.\r\n\r\nUse `Array.prototype.filter()` to create a new array that contains every nth element of a given array.",
         "codeBlocks": {
           "es6": "const everyNth = (arr, nth) => arr.filter((e, i) => i % nth === nth - 1);",
-          "es5": "\"use strict\";\n\nvar everyNth = function everyNth(arr, nth) {\n  return arr.filter(function (e, i) {\n    return i % nth === nth - 1;\n  });\n};",
+          "es5": "var everyNth = function everyNth(arr, nth) {\n  return arr.filter(function (e, i) {\n    return i % nth === nth - 1;\n  });\n};",
           "example": "everyNth([1, 2, 3, 4, 5, 6], 2); // [ 2, 4, 6 ]"
         },
         "tags": [
@@ -1617,7 +1617,7 @@
         "text": "Extends a 3-digit color code to a 6-digit color code.\r\n\r\nUse `Array.prototype.map()`, `String.prototype.split()` and `Array.prototype.join()` to join the mapped array for converting a 3-digit RGB notated hexadecimal color-code to the 6-digit form.\r\n`Array.prototype.slice()` is used to remove `#` from string start since it's added once.",
         "codeBlocks": {
           "es6": "const extendHex = shortHex =>\r\n  '#' +\r\n  shortHex\r\n    .slice(shortHex.startsWith('#') ? 1 : 0)\r\n    .split('')\r\n    .map(x => x + x)\r\n    .join('');",
-          "es5": "\"use strict\";\n\nvar extendHex = function extendHex(shortHex) {\n  return '#' + shortHex.slice(shortHex.startsWith('#') ? 1 : 0).split('').map(function (x) {\n    return x + x;\n  }).join('');\n};",
+          "es5": "var extendHex = function extendHex(shortHex) {\n  return '#' + shortHex.slice(shortHex.startsWith('#') ? 1 : 0).split('').map(function (x) {\n    return x + x;\n  }).join('');\n};",
           "example": "extendHex('#03f'); // '#0033ff'\r\nextendHex('05a'); // '#0055aa'"
         },
         "tags": [
@@ -1638,8 +1638,8 @@
         "fileName": "factorial.md",
         "text": "Calculates the factorial of a number.\r\n\r\nUse recursion.\r\nIf `n` is less than or equal to `1`, return `1`.\r\nOtherwise, return the product of `n` and the factorial of `n - 1`.\r\nThrows an exception if `n` is a negative number.",
         "codeBlocks": {
-          "es6": "const factorial = n =>\r\n  n < 0\r\n    ? (() => {\r\n        throw new TypeError('Negative numbers are not allowed!');\r\n      })()\r\n    : n <= 1\r\n      ? 1\r\n      : n * factorial(n - 1);",
-          "es5": "\"use strict\";\n\nvar factorial = function factorial(n) {\n  return n < 0 ? function () {\n    throw new TypeError('Negative numbers are not allowed!');\n  }() : n <= 1 ? 1 : n * factorial(n - 1);\n};",
+          "es6": "const factorial = n =>\r\n  n < 0\r\n    ? (() => {\r\n      throw new TypeError('Negative numbers are not allowed!');\r\n    })()\r\n    : n <= 1\r\n      ? 1\r\n      : n * factorial(n - 1);",
+          "es5": "var factorial = function factorial(n) {\n  return n < 0 ? function () {\n    throw new TypeError('Negative numbers are not allowed!');\n  }() : n <= 1 ? 1 : n * factorial(n - 1);\n};",
           "example": "factorial(6); // 720"
         },
         "tags": [
@@ -1650,7 +1650,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "683bb22450b09dc717ef83b36ffcc6729a48891fcc47bab587b389f232597563"
+        "hash": "50b2980119026b898646420c2dc3cf2f394f5162f1a336cf64bc8d0244e54f26"
       }
     },
     {
@@ -1661,7 +1661,7 @@
         "text": "Generates an array, containing the Fibonacci sequence, up until the nth term.\r\n\r\nCreate an empty array of the specific length, initializing the first two values (`0` and `1`).\r\nUse `Array.prototype.reduce()` to add values into the array, using the sum of the last two values, except for the first two.",
         "codeBlocks": {
           "es6": "const fibonacci = n =>\r\n  Array.from({ length: n }).reduce(\r\n    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),\r\n    []\r\n  );",
-          "es5": "\"use strict\";\n\nvar fibonacci = function fibonacci(n) {\n  return Array.from({\n    length: n\n  }).reduce(function (acc, val, i) {\n    return acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i);\n  }, []);\n};",
+          "es5": "var fibonacci = function fibonacci(n) {\n  return Array.from({\n    length: n\n  }).reduce(function (acc, val, i) {\n    return acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i);\n  }, []);\n};",
           "example": "fibonacci(6); // [0, 1, 1, 2, 3, 5]"
         },
         "tags": [
@@ -1683,7 +1683,7 @@
         "text": "Filters out the non-unique values in an array.\r\n\r\nUse `Array.prototype.filter()` for an array containing only the unique values.",
         "codeBlocks": {
           "es6": "const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));",
-          "es5": "\"use strict\";\n\nvar filterNonUnique = function filterNonUnique(arr) {\n  return arr.filter(function (i) {\n    return arr.indexOf(i) === arr.lastIndexOf(i);\n  });\n};",
+          "es5": "var filterNonUnique = function filterNonUnique(arr) {\n  return arr.filter(function (i) {\n    return arr.indexOf(i) === arr.lastIndexOf(i);\n  });\n};",
           "example": "filterNonUnique([1, 2, 2, 3, 4, 4, 5]); // [1, 3, 5]"
         },
         "tags": [
@@ -1704,7 +1704,7 @@
         "text": "Filters out the non-unique values in an array, based on a provided comparator function.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.every()` for an array containing only the unique values, based on the comparator function, `fn`.\r\nThe comparator function takes four arguments: the values of the two elements being compared and their indexes.",
         "codeBlocks": {
           "es6": "const filterNonUniqueBy = (arr, fn) =>\r\n  arr.filter((v, i) => arr.every((x, j) => (i === j) === fn(v, x, i, j)));",
-          "es5": "\"use strict\";\n\nvar filterNonUniqueBy = function filterNonUniqueBy(arr, fn) {\n  return arr.filter(function (v, i) {\n    return arr.every(function (x, j) {\n      return i === j === fn(v, x, i, j);\n    });\n  });\n};",
+          "es5": "var filterNonUniqueBy = function filterNonUniqueBy(arr, fn) {\n  return arr.filter(function (v, i) {\n    return arr.every(function (x, j) {\n      return i === j === fn(v, x, i, j);\n    });\n  });\n};",
           "example": "filterNonUniqueBy(\r\n  [\r\n    { id: 0, value: 'a' },\r\n    { id: 1, value: 'b' },\r\n    { id: 2, value: 'c' },\r\n    { id: 1, value: 'd' },\r\n    { id: 0, value: 'e' }\r\n  ],\r\n  (a, b) => a.id == b.id\r\n); // [ { id: 2, value: 'c' } ]"
         },
         "tags": [
@@ -1726,7 +1726,7 @@
         "text": "Returns the first key that satisfies the provided testing function. Otherwise `undefined` is returned.\r\n\r\nUse `Object.keys(obj)` to get all the properties of the object, `Array.prototype.find()` to test the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.",
         "codeBlocks": {
           "es6": "const findKey = (obj, fn) => Object.keys(obj).find(key => fn(obj[key], key, obj));",
-          "es5": "\"use strict\";\n\nvar findKey = function findKey(obj, fn) {\n  return Object.keys(obj).find(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
+          "es5": "var findKey = function findKey(obj, fn) {\n  return Object.keys(obj).find(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
           "example": "findKey(\r\n  {\r\n    barney: { age: 36, active: true },\r\n    fred: { age: 40, active: false },\r\n    pebbles: { age: 1, active: true }\r\n  },\r\n  o => o['active']\r\n); // 'barney'"
         },
         "tags": [
@@ -1748,7 +1748,7 @@
         "text": "Returns the last element for which the provided function returns a truthy value.\r\n\r\nUse `Array.prototype.filter()` to remove elements for which `fn` returns falsey values, `Array.prototype.pop()` to get the last one.",
         "codeBlocks": {
           "es6": "const findLast = (arr, fn) => arr.filter(fn).pop();",
-          "es5": "\"use strict\";\n\nvar findLast = function findLast(arr, fn) {\n  return arr.filter(fn).pop();\n};",
+          "es5": "var findLast = function findLast(arr, fn) {\n  return arr.filter(fn).pop();\n};",
           "example": "findLast([1, 2, 3, 4], n => n % 2 === 1); // 3"
         },
         "tags": [
@@ -1769,7 +1769,7 @@
         "text": "Returns the index of the last element for which the provided function returns a truthy value.\r\n\r\nUse `Array.prototype.map()` to map each element to an array with its index and value.\r\nUse `Array.prototype.filter()` to remove elements for which `fn` returns falsey values, `Array.prototype.pop()` to get the last one.",
         "codeBlocks": {
           "es6": "const findLastIndex = (arr, fn) =>\r\n  arr\r\n    .map((val, i) => [i, val])\r\n    .filter(([i, val]) => fn(val, i, arr))\r\n    .pop()[0];",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar findLastIndex = function findLastIndex(arr, fn) {\n  return arr.map(function (val, i) {\n    return [i, val];\n  }).filter(function (_ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        i = _ref2[0],\n        val = _ref2[1];\n\n    return fn(val, i, arr);\n  }).pop()[0];\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar findLastIndex = function findLastIndex(arr, fn) {\n  return arr.map(function (val, i) {\n    return [i, val];\n  }).filter(function (_ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        i = _ref2[0],\n        val = _ref2[1];\n\n    return fn(val, i, arr);\n  }).pop()[0];\n};",
           "example": "findLastIndex([1, 2, 3, 4], n => n % 2 === 1); // 2 (index of the value 3)"
         },
         "tags": [
@@ -1791,7 +1791,7 @@
         "text": "Returns the last key that satisfies the provided testing function.\r\nOtherwise `undefined` is returned.\r\n\r\nUse `Object.keys(obj)` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order and `Array.prototype.find()` to test the provided function for each key-value pair.\r\nThe callback receives three arguments - the value, the key and the object.",
         "codeBlocks": {
           "es6": "const findLastKey = (obj, fn) =>\r\n  Object.keys(obj)\r\n    .reverse()\r\n    .find(key => fn(obj[key], key, obj));",
-          "es5": "\"use strict\";\n\nvar findLastKey = function findLastKey(obj, fn) {\n  return Object.keys(obj).reverse().find(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
+          "es5": "var findLastKey = function findLastKey(obj, fn) {\n  return Object.keys(obj).reverse().find(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
           "example": "findLastKey(\r\n  {\r\n    barney: { age: 36, active: true },\r\n    fred: { age: 40, active: false },\r\n    pebbles: { age: 1, active: true }\r\n  },\r\n  o => o['active']\r\n); // 'pebbles'"
         },
         "tags": [
@@ -1813,7 +1813,7 @@
         "text": "Flattens an array up to the specified depth.\r\n\r\nUse recursion, decrementing `depth` by 1 for each level of depth.\r\nUse `Array.prototype.reduce()` and `Array.prototype.concat()` to merge elements or arrays.\r\nBase case, for `depth` equal to `1` stops recursion.\r\nOmit the second argument, `depth` to flatten only to a depth of `1` (single flatten).",
         "codeBlocks": {
           "es6": "const flatten = (arr, depth = 1) =>\r\n  arr.reduce((a, v) => a.concat(depth > 1 && Array.isArray(v) ? flatten(v, depth - 1) : v), []);",
-          "es5": "\"use strict\";\n\nvar flatten = function flatten(arr) {\n  var depth = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.reduce(function (a, v) {\n    return a.concat(depth > 1 && Array.isArray(v) ? flatten(v, depth - 1) : v);\n  }, []);\n};",
+          "es5": "var flatten = function flatten(arr) {\n  var depth = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.reduce(function (a, v) {\n    return a.concat(depth > 1 && Array.isArray(v) ? flatten(v, depth - 1) : v);\n  }, []);\n};",
           "example": "flatten([1, [2], 3, 4]); // [1, 2, 3, 4]\r\nflatten([1, [2, [3, [4, 5], 6], 7], 8], 2); // [1, 2, 3, [4, 5], 6, 7, 8]"
         },
         "tags": [
@@ -1834,7 +1834,7 @@
         "text": "Flatten an object with the paths for keys.\r\n\r\nUse recursion.\r\nUse `Object.keys(obj)` combined with `Array.prototype.reduce()` to convert every leaf node to a flattened path node.\r\nIf the value of a key is an object, the function calls itself with the appropriate `prefix` to create the path using `Object.assign()`.\r\nOtherwise, it adds the appropriate prefixed key-value pair to the accumulator object.\r\nYou should always omit the second argument, `prefix`, unless you want every key to have a prefix.",
         "codeBlocks": {
           "es6": "const flattenObject = (obj, prefix = '') =>\r\n  Object.keys(obj).reduce((acc, k) => {\r\n    const pre = prefix.length ? prefix + '.' : '';\r\n    if (typeof obj[k] === 'object') Object.assign(acc, flattenObject(obj[k], pre + k));\r\n    else acc[pre + k] = obj[k];\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar flattenObject = function flattenObject(obj) {\n  var prefix = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';\n  return Object.keys(obj).reduce(function (acc, k) {\n    var pre = prefix.length ? prefix + '.' : '';\n    if (_typeof(obj[k]) === 'object') Object.assign(acc, flattenObject(obj[k], pre + k));else acc[pre + k] = obj[k];\n    return acc;\n  }, {});\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar flattenObject = function flattenObject(obj) {\n  var prefix = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';\n  return Object.keys(obj).reduce(function (acc, k) {\n    var pre = prefix.length ? prefix + '.' : '';\n    if (_typeof(obj[k]) === 'object') Object.assign(acc, flattenObject(obj[k], pre + k));else acc[pre + k] = obj[k];\n    return acc;\n  }, {});\n};",
           "example": "flattenObject({ a: { b: { c: 1 } }, d: 1 }); // { 'a.b.c': 1, d: 1 }"
         },
         "tags": [
@@ -1856,7 +1856,7 @@
         "text": "Flip takes a function as an argument, then makes the first argument the last.\r\n\r\nReturn a closure that takes variadic inputs, and splices the last argument to make it the first argument before applying the rest.",
         "codeBlocks": {
           "es6": "const flip = fn => (first, ...rest) => fn(...rest, first);",
-          "es5": "\"use strict\";\n\nvar flip = function flip(fn) {\n  return function (first) {\n    for (var _len = arguments.length, rest = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n      rest[_key - 1] = arguments[_key];\n    }\n\n    return fn.apply(void 0, rest.concat([first]));\n  };\n};",
+          "es5": "var flip = function flip(fn) {\n  return function (first) {\n    for (var _len = arguments.length, rest = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n      rest[_key - 1] = arguments[_key];\n    }\n\n    return fn.apply(void 0, rest.concat([first]));\n  };\n};",
           "example": "let a = { name: 'John Smith' };\nlet b = {};\nconst mergeFrom = flip(Object.assign);\nlet mergePerson = mergeFrom.bind(null, a);\nmergePerson(b); // == b\nb = {};\nObject.assign(b, a); // == b"
         },
         "tags": [
@@ -1878,7 +1878,7 @@
         "text": "Executes a provided function once for each array element, starting from the array's last element.\r\n\r\nUse `Array.prototype.slice(0)` to clone the given array, `Array.prototype.reverse()` to reverse it and `Array.prototype.forEach()` to iterate over the reversed array.",
         "codeBlocks": {
           "es6": "const forEachRight = (arr, callback) =>\r\n  arr\r\n    .slice(0)\r\n    .reverse()\r\n    .forEach(callback);",
-          "es5": "\"use strict\";\n\nvar forEachRight = function forEachRight(arr, callback) {\n  return arr.slice(0).reverse().forEach(callback);\n};",
+          "es5": "var forEachRight = function forEachRight(arr, callback) {\n  return arr.slice(0).reverse().forEach(callback);\n};",
           "example": "forEachRight([1, 2, 3, 4], val => console.log(val)); // '4', '3', '2', '1'"
         },
         "tags": [
@@ -1900,7 +1900,7 @@
         "text": "Returns the human readable format of the given number of milliseconds.\r\n\r\nDivide `ms` with the appropriate values to obtain the appropriate values for `day`, `hour`, `minute`, `second` and `millisecond`.\r\nUse `Object.entries()` with `Array.prototype.filter()` to keep only non-zero values.\r\nUse `Array.prototype.map()` to create the string for each value, pluralizing appropriately.\r\nUse `String.prototype.join(', ')` to combine the values into a string.",
         "codeBlocks": {
           "es6": "const formatDuration = ms => {\r\n  if (ms < 0) ms = -ms;\r\n  const time = {\r\n    day: Math.floor(ms / 86400000),\r\n    hour: Math.floor(ms / 3600000) % 24,\r\n    minute: Math.floor(ms / 60000) % 60,\r\n    second: Math.floor(ms / 1000) % 60,\r\n    millisecond: Math.floor(ms) % 1000\r\n  };\r\n  return Object.entries(time)\r\n    .filter(val => val[1] !== 0)\r\n    .map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`)\r\n    .join(', ');\r\n};",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar formatDuration = function formatDuration(ms) {\n  if (ms < 0) ms = -ms;\n  var time = {\n    day: Math.floor(ms / 86400000),\n    hour: Math.floor(ms / 3600000) % 24,\n    minute: Math.floor(ms / 60000) % 60,\n    second: Math.floor(ms / 1000) % 60,\n    millisecond: Math.floor(ms) % 1000\n  };\n  return Object.entries(time).filter(function (val) {\n    return val[1] !== 0;\n  }).map(function (_ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        key = _ref2[0],\n        val = _ref2[1];\n\n    return \"\".concat(val, \" \").concat(key).concat(val !== 1 ? 's' : '');\n  }).join(', ');\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar formatDuration = function formatDuration(ms) {\n  if (ms < 0) ms = -ms;\n  var time = {\n    day: Math.floor(ms / 86400000),\n    hour: Math.floor(ms / 3600000) % 24,\n    minute: Math.floor(ms / 60000) % 60,\n    second: Math.floor(ms / 1000) % 60,\n    millisecond: Math.floor(ms) % 1000\n  };\n  return Object.entries(time).filter(function (val) {\n    return val[1] !== 0;\n  }).map(function (_ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        key = _ref2[0],\n        val = _ref2[1];\n\n    return \"\".concat(val, \" \").concat(key).concat(val !== 1 ? 's' : '');\n  }).join(', ');\n};",
           "example": "formatDuration(1001); // '1 second, 1 millisecond'\r\nformatDuration(34325055574); // '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'"
         },
         "tags": [
@@ -1924,7 +1924,7 @@
         "text": "Iterates over all own properties of an object, running a callback for each one.\r\n\r\nUse `Object.keys(obj)` to get all the properties of the object, `Array.prototype.forEach()` to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.",
         "codeBlocks": {
           "es6": "const forOwn = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key], key, obj));",
-          "es5": "\"use strict\";\n\nvar forOwn = function forOwn(obj, fn) {\n  return Object.keys(obj).forEach(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
+          "es5": "var forOwn = function forOwn(obj, fn) {\n  return Object.keys(obj).forEach(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
           "example": "forOwn({ foo: 'bar', a: 1 }, v => console.log(v)); // 'bar', 1"
         },
         "tags": [
@@ -1945,7 +1945,7 @@
         "text": "Iterates over all own properties of an object in reverse, running a callback for each one.\r\n\r\nUse `Object.keys(obj)` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order and `Array.prototype.forEach()` to run the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.",
         "codeBlocks": {
           "es6": "const forOwnRight = (obj, fn) =>\r\n  Object.keys(obj)\r\n    .reverse()\r\n    .forEach(key => fn(obj[key], key, obj));",
-          "es5": "\"use strict\";\n\nvar forOwnRight = function forOwnRight(obj, fn) {\n  return Object.keys(obj).reverse().forEach(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
+          "es5": "var forOwnRight = function forOwnRight(obj, fn) {\n  return Object.keys(obj).reverse().forEach(function (key) {\n    return fn(obj[key], key, obj);\n  });\n};",
           "example": "forOwnRight({ foo: 'bar', a: 1 }, v => console.log(v)); // 1, 'bar'"
         },
         "tags": [
@@ -1966,7 +1966,7 @@
         "text": "Converts a string from camelcase.\r\n\r\nUse `String.prototype.replace()` to remove underscores, hyphens, and spaces and convert words to camelcase.\r\nOmit the second argument to use a default `separator` of `_`.",
         "codeBlocks": {
           "es6": "const fromCamelCase = (str, separator = '_') =>\r\n  str\r\n    .replace(/([a-z\\d])([A-Z])/g, '$1' + separator + '$2')\r\n    .replace(/([A-Z]+)([A-Z][a-z\\d]+)/g, '$1' + separator + '$2')\r\n    .toLowerCase();",
-          "es5": "\"use strict\";\n\nvar fromCamelCase = function fromCamelCase(str) {\n  var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '_';\n  return str.replace(/([a-z\\d])([A-Z])/g, '$1' + separator + '$2').replace(/([A-Z]+)([A-Z][a-z\\d]+)/g, '$1' + separator + '$2').toLowerCase();\n};",
+          "es5": "var fromCamelCase = function fromCamelCase(str) {\n  var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '_';\n  return str.replace(/([a-z\\d])([A-Z])/g, '$1' + separator + '$2').replace(/([A-Z]+)([A-Z][a-z\\d]+)/g, '$1' + separator + '$2').toLowerCase();\n};",
           "example": "fromCamelCase('someDatabaseFieldName', ' '); // 'some database field name'\r\nfromCamelCase('someLabelThatNeedsToBeCamelized', '-'); // 'some-label-that-needs-to-be-camelized'\r\nfromCamelCase('someJavascriptProperty', '_'); // 'some_javascript_property'"
         },
         "tags": [
@@ -1987,7 +1987,7 @@
         "text": "Logs the name of a function.\r\n\r\nUse `console.debug()` and the `name` property of the passed method to log the method's name to the `debug` channel of the console.",
         "codeBlocks": {
           "es6": "const functionName = fn => (console.debug(fn.name), fn);",
-          "es5": "\"use strict\";\n\nvar functionName = function functionName(fn) {\n  return console.debug(fn.name), fn;\n};",
+          "es5": "var functionName = function functionName(fn) {\n  return console.debug(fn.name), fn;\n};",
           "example": "functionName(Math.max); // max (logged in debug channel of console)"
         },
         "tags": [
@@ -2009,7 +2009,7 @@
         "text": "Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.\r\n\r\nUse `Object.keys(obj)` to iterate over the object's own properties.\r\nIf `inherited` is `true`, use `Object.get.PrototypeOf(obj)` to also get the object's inherited properties.\r\nUse `Array.prototype.filter()` to keep only those properties that are functions.\r\nOmit the second argument, `inherited`, to not include inherited properties by default.",
         "codeBlocks": {
           "es6": "const functions = (obj, inherited = false) =>\r\n  (inherited\r\n    ? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))]\r\n    : Object.keys(obj)\r\n  ).filter(key => typeof obj[key] === 'function');",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar functions = function functions(obj) {\n  var inherited = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return (inherited ? _toConsumableArray(Object.keys(obj)).concat(_toConsumableArray(Object.keys(Object.getPrototypeOf(obj)))) : Object.keys(obj)).filter(function (key) {\n    return typeof obj[key] === 'function';\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar functions = function functions(obj) {\n  var inherited = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return (inherited ? _toConsumableArray(Object.keys(obj)).concat(_toConsumableArray(Object.keys(Object.getPrototypeOf(obj)))) : Object.keys(obj)).filter(function (key) {\n    return typeof obj[key] === 'function';\n  });\n};",
           "example": "function Foo() {\r\n  this.a = () => 1;\r\n  this.b = () => 2;\r\n}\r\nFoo.prototype.c = () => 3;\r\nfunctions(new Foo()); // ['a', 'b']\r\nfunctions(new Foo(), true); // ['a', 'b', 'c']"
         },
         "tags": [
@@ -2031,7 +2031,7 @@
         "text": "Calculates the greatest common divisor between two or more numbers/arrays.\r\n\r\nThe inner `_gcd` function uses recursion.\r\nBase case is when `y` equals `0`. In this case, return `x`.\r\nOtherwise, return the GCD of `y` and the remainder of the division `x/y`.",
         "codeBlocks": {
           "es6": "const gcd = (...arr) => {\r\n  const _gcd = (x, y) => (!y ? x : gcd(y, x % y));\r\n  return [...arr].reduce((a, b) => _gcd(a, b));\r\n};",
-          "es5": "\"use strict\";\n\nvar gcd = function gcd() {\n  var _gcd = function _gcd(x, y) {\n    return !y ? x : gcd(y, x % y);\n  };\n\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (a, b) {\n    return _gcd(a, b);\n  });\n};",
+          "es5": "var gcd = function gcd() {\n  var _gcd = function _gcd(x, y) {\n    return !y ? x : gcd(y, x % y);\n  };\n\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (a, b) {\n    return _gcd(a, b);\n  });\n};",
           "example": "gcd(8, 36); // 4\r\ngcd(...[12, 8, 32]); // 4"
         },
         "tags": [
@@ -2053,7 +2053,7 @@
         "text": "Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive and the ratio between two terms is `step`.\r\nReturns an error if `step` equals `1`.\r\n\r\nUse `Array.from()`, `Math.log()` and `Math.floor()` to create an array of the desired length, `Array.prototype.map()` to fill with the desired values in a range.\r\nOmit the second argument, `start`, to use a default value of `1`.\r\nOmit the third argument, `step`, to use a default value of `2`.",
         "codeBlocks": {
           "es6": "const geometricProgression = (end, start = 1, step = 2) =>\r\n  Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(\r\n    (v, i) => start * step ** i\r\n  );",
-          "es5": "\"use strict\";\n\nvar geometricProgression = function geometricProgression(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 2;\n  return Array.from({\n    length: Math.floor(Math.log(end / start) / Math.log(step)) + 1\n  }).map(function (v, i) {\n    return start * Math.pow(step, i);\n  });\n};",
+          "es5": "var geometricProgression = function geometricProgression(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 2;\n  return Array.from({\n    length: Math.floor(Math.log(end / start) / Math.log(step)) + 1\n  }).map(function (v, i) {\n    return start * Math.pow(step, i);\n  });\n};",
           "example": "geometricProgression(256); // [1, 2, 4, 8, 16, 32, 64, 128, 256]\r\ngeometricProgression(256, 3); // [3, 6, 12, 24, 48, 96, 192]\r\ngeometricProgression(256, 1, 4); // [1, 4, 16, 64, 256]"
         },
         "tags": [
@@ -2074,7 +2074,7 @@
         "text": "Retrieve a set of properties indicated by the given selectors from an object.\r\n\r\nUse `Array.prototype.map()` for each selector, `String.prototype.replace()` to replace square brackets with dots, `String.prototype.split('.')` to split each selector, `Array.prototype.filter()` to remove empty values and `Array.prototype.reduce()` to get the value indicated by it.",
         "codeBlocks": {
           "es6": "const get = (from, ...selectors) =>\r\n  [...selectors].map(s =>\r\n    s\r\n      .replace(/\\[([^\\[\\]]*)\\]/g, '.$1.')\r\n      .split('.')\r\n      .filter(t => t !== '')\r\n      .reduce((prev, cur) => prev && prev[cur], from)\r\n  );",
-          "es5": "\"use strict\";\n\nvar get = function get(from) {\n  for (var _len = arguments.length, selectors = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    selectors[_key - 1] = arguments[_key];\n  }\n\n  return selectors.concat().map(function (s) {\n    return s.replace(/\\[([^\\[\\]]*)\\]/g, '.$1.').split('.').filter(function (t) {\n      return t !== '';\n    }).reduce(function (prev, cur) {\n      return prev && prev[cur];\n    }, from);\n  });\n};",
+          "es5": "var get = function get(from) {\n  for (var _len = arguments.length, selectors = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    selectors[_key - 1] = arguments[_key];\n  }\n\n  return selectors.concat().map(function (s) {\n    return s.replace(/\\[([^\\[\\]]*)\\]/g, '.$1.').split('.').filter(function (t) {\n      return t !== '';\n    }).reduce(function (prev, cur) {\n      return prev && prev[cur];\n    }, from);\n  });\n};",
           "example": "const obj = { selector: { to: { val: 'val to select' } }, target: [1, 2, { a: 'test' }] };\r\nget(obj, 'selector.to.val', 'target[0]', 'target[2].a'); // ['val to select', 1, 'test']"
         },
         "tags": [
@@ -2095,7 +2095,7 @@
         "text": "Returns a string of the form `HH:MM:SS` from a `Date` object.\r\n\r\nUse `Date.prototype.toString()` and `String.prototype.slice()` to get the `HH:MM:SS` part of a given `Date` object.",
         "codeBlocks": {
           "es6": "const getColonTimeFromDate = date => date.toTimeString().slice(0, 8);",
-          "es5": "\"use strict\";\n\nvar getColonTimeFromDate = function getColonTimeFromDate(date) {\n  return date.toTimeString().slice(0, 8);\n};",
+          "es5": "var getColonTimeFromDate = function getColonTimeFromDate(date) {\n  return date.toTimeString().slice(0, 8);\n};",
           "example": "getColonTimeFromDate(new Date()); // \"08:38:00\""
         },
         "tags": [
@@ -2116,7 +2116,7 @@
         "text": "Returns the difference (in days) between two dates.\r\n\r\nCalculate the difference (in days) between two `Date` objects.",
         "codeBlocks": {
           "es6": "const getDaysDiffBetweenDates = (dateInitial, dateFinal) =>\r\n  (dateFinal - dateInitial) / (1000 * 3600 * 24);",
-          "es5": "\"use strict\";\n\nvar getDaysDiffBetweenDates = function getDaysDiffBetweenDates(dateInitial, dateFinal) {\n  return (dateFinal - dateInitial) / (1000 * 3600 * 24);\n};",
+          "es5": "var getDaysDiffBetweenDates = function getDaysDiffBetweenDates(dateInitial, dateFinal) {\n  return (dateFinal - dateInitial) / (1000 * 3600 * 24);\n};",
           "example": "getDaysDiffBetweenDates(new Date('2017-12-13'), new Date('2017-12-22')); // 9"
         },
         "tags": [
@@ -2137,7 +2137,7 @@
         "text": "Fetches all images from within an element and puts them into an array\r\n\r\nUse `Element.prototype.getElementsByTagName()` to fetch all `<img>` elements inside the provided element, `Array.prototype.map()` to map every `src` attribute of their respective `<img>` element, then create a `Set` to eliminate duplicates and return the array.",
         "codeBlocks": {
           "es6": "const getImages = (el, includeDuplicates = false) => {\r\n  const images = [...el.getElementsByTagName('img')].map(img => img.getAttribute('src'));\r\n  return includeDuplicates ? images : [...new Set(images)];\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar getImages = function getImages(el) {\n  var includeDuplicates = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var images = _toConsumableArray(el.getElementsByTagName('img')).map(function (img) {\n    return img.getAttribute('src');\n  });\n\n  return includeDuplicates ? images : _toConsumableArray(new Set(images));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar getImages = function getImages(el) {\n  var includeDuplicates = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var images = _toConsumableArray(el.getElementsByTagName('img')).map(function (img) {\n    return img.getAttribute('src');\n  });\n\n  return includeDuplicates ? images : _toConsumableArray(new Set(images));\n};",
           "example": "getImages(document, true); // ['image1.jpg', 'image2.png', 'image1.png', '...']\r\ngetImages(document, false); // ['image1.jpg', 'image2.png', '...']"
         },
         "tags": [
@@ -2158,7 +2158,7 @@
         "text": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\r\n\r\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.",
         "codeBlocks": {
           "es6": "const getMeridiemSuffixOfInteger = num =>\r\n  num === 0 || num === 24\r\n    ? 12 + 'am'\r\n    : num === 12\r\n      ? 12 + 'pm'\r\n      : num < 12\r\n        ? (num % 12) + 'am'\r\n        : (num % 12) + 'pm';",
-          "es5": "\"use strict\";\n\nvar getMeridiemSuffixOfInteger = function getMeridiemSuffixOfInteger(num) {\n  return num === 0 || num === 24 ? 12 + 'am' : num === 12 ? 12 + 'pm' : num < 12 ? num % 12 + 'am' : num % 12 + 'pm';\n};",
+          "es5": "var getMeridiemSuffixOfInteger = function getMeridiemSuffixOfInteger(num) {\n  return num === 0 || num === 24 ? 12 + 'am' : num === 12 ? 12 + 'pm' : num < 12 ? num % 12 + 'am' : num % 12 + 'pm';\n};",
           "example": "getMeridiemSuffixOfInteger(0); // \"12am\"\r\ngetMeridiemSuffixOfInteger(11); // \"11am\"\r\ngetMeridiemSuffixOfInteger(13); // \"1pm\"\r\ngetMeridiemSuffixOfInteger(25); // \"1pm\""
         },
         "tags": [
@@ -2179,7 +2179,7 @@
         "text": "Returns the scroll position of the current page.\r\n\r\nUse `pageXOffset` and `pageYOffset` if they are defined, otherwise `scrollLeft` and `scrollTop`.\r\nYou can omit `el` to use a default value of `window`.",
         "codeBlocks": {
           "es6": "const getScrollPosition = (el = window) => ({\r\n  x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,\r\n  y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop\r\n});",
-          "es5": "\"use strict\";\n\nvar getScrollPosition = function getScrollPosition() {\n  var el = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : window;\n  return {\n    x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,\n    y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop\n  };\n};",
+          "es5": "var getScrollPosition = function getScrollPosition() {\n  var el = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : window;\n  return {\n    x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,\n    y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop\n  };\n};",
           "example": "getScrollPosition(); // {x: 0, y: 200}"
         },
         "tags": [
@@ -2200,7 +2200,7 @@
         "text": "Returns the value of a CSS rule for the specified element.\r\n\r\nUse `Window.getComputedStyle()` to get the value of the CSS rule for the specified element.",
         "codeBlocks": {
           "es6": "const getStyle = (el, ruleName) => getComputedStyle(el)[ruleName];",
-          "es5": "\"use strict\";\n\nvar getStyle = function getStyle(el, ruleName) {\n  return getComputedStyle(el)[ruleName];\n};",
+          "es5": "var getStyle = function getStyle(el, ruleName) {\n  return getComputedStyle(el)[ruleName];\n};",
           "example": "getStyle(document.querySelector('p'), 'font-size'); // '16px'"
         },
         "tags": [
@@ -2222,7 +2222,7 @@
         "text": "Returns the native type of a value.\r\n\r\nReturns lowercased constructor name of value, `\"undefined\"` or `\"null\"` if value is `undefined` or `null`.",
         "codeBlocks": {
           "es6": "const getType = v =>\r\n  v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();",
-          "es5": "\"use strict\";\n\nvar getType = function getType(v) {\n  return v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();\n};",
+          "es5": "var getType = function getType(v) {\n  return v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();\n};",
           "example": "getType(new Set([1, 2, 3])); // 'set'"
         },
         "tags": [
@@ -2243,7 +2243,7 @@
         "text": "Returns an object containing the parameters of the current URL.\r\n\r\nUse `String.match()` with an appropriate regular expression to get all key-value pairs, `Array.prototype.reduce()` to map and combine them into a single object.\r\nPass `location.search` as the argument to apply to the current `url`.",
         "codeBlocks": {
           "es6": "const getURLParameters = url =>\r\n  (url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(\r\n    (a, v) => ((a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1)), a),\r\n    {}\r\n  );",
-          "es5": "\"use strict\";\n\nvar getURLParameters = function getURLParameters(url) {\n  return (url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(function (a, v) {\n    return a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1), a;\n  }, {});\n};",
+          "es5": "var getURLParameters = function getURLParameters(url) {\n  return (url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(function (a, v) {\n    return a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1), a;\n  }, {});\n};",
           "example": "getURLParameters('http://url.com/page?name=Adam&surname=Smith'); // {name: 'Adam', surname: 'Smith'}\r\ngetURLParameters('google.com'); // {}"
         },
         "tags": [
@@ -2267,7 +2267,7 @@
         "text": "Groups the elements of an array based on the given function.\r\n\r\nUse `Array.prototype.map()` to map the values of an array to a function or property name.\r\nUse `Array.prototype.reduce()` to create an object, where the keys are produced from the mapped results.",
         "codeBlocks": {
           "es6": "const groupBy = (arr, fn) =>\r\n  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val, i) => {\r\n    acc[val] = (acc[val] || []).concat(arr[i]);\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar groupBy = function groupBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val, i) {\n    acc[val] = (acc[val] || []).concat(arr[i]);\n    return acc;\n  }, {});\n};",
+          "es5": "var groupBy = function groupBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val, i) {\n    acc[val] = (acc[val] || []).concat(arr[i]);\n    return acc;\n  }, {});\n};",
           "example": "groupBy([6.1, 4.2, 6.3], Math.floor); // {4: [4.2], 6: [6.1, 6.3]}\r\ngroupBy(['one', 'two', 'three'], 'length'); // {3: ['one', 'two'], 5: ['three']}"
         },
         "tags": [
@@ -2289,7 +2289,7 @@
         "text": "Calculates the Hamming distance between two values.\r\n\r\nUse XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.\r\nCount and return the number of `1`s in the string, using `match(/1/g)`.",
         "codeBlocks": {
           "es6": "const hammingDistance = (num1, num2) => ((num1 ^ num2).toString(2).match(/1/g) || '').length;",
-          "es5": "\"use strict\";\n\nvar hammingDistance = function hammingDistance(num1, num2) {\n  return ((num1 ^ num2).toString(2).match(/1/g) || '').length;\n};",
+          "es5": "var hammingDistance = function hammingDistance(num1, num2) {\n  return ((num1 ^ num2).toString(2).match(/1/g) || '').length;\n};",
           "example": "hammingDistance(2, 3); // 1"
         },
         "tags": [
@@ -2310,7 +2310,7 @@
         "text": "Returns `true` if the element has the specified class, `false` otherwise.\r\n\r\nUse `element.classList.contains()` to check if the element has the specified class.",
         "codeBlocks": {
           "es6": "const hasClass = (el, className) => el.classList.contains(className);",
-          "es5": "\"use strict\";\n\nvar hasClass = function hasClass(el, className) {\n  return el.classList.contains(className);\n};",
+          "es5": "var hasClass = function hasClass(el, className) {\n  return el.classList.contains(className);\n};",
           "example": "hasClass(document.querySelector('p.special'), 'special'); // true"
         },
         "tags": [
@@ -2332,7 +2332,7 @@
         "text": "Check if the current process's arguments contain the specified flags.\r\n\r\nUse `Array.prototype.every()` and `Array.prototype.includes()` to check if `process.argv` contains all the specified flags.\r\nUse a regular expression to test if the specified flags are prefixed with `-` or `--` and prefix them accordingly.",
         "codeBlocks": {
           "es6": "const hasFlags = (...flags) =>\r\n  flags.every(flag => process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag));",
-          "es5": "\"use strict\";\n\nvar hasFlags = function hasFlags() {\n  for (var _len = arguments.length, flags = new Array(_len), _key = 0; _key < _len; _key++) {\n    flags[_key] = arguments[_key];\n  }\n\n  return flags.every(function (flag) {\n    return process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag);\n  });\n};",
+          "es5": "var hasFlags = function hasFlags() {\n  for (var _len = arguments.length, flags = new Array(_len), _key = 0; _key < _len; _key++) {\n    flags[_key] = arguments[_key];\n  }\n\n  return flags.every(function (flag) {\n    return process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag);\n  });\n};",
           "example": "// node myScript.js -s --test --cool=true\r\nhasFlags('-s'); // true\r\nhasFlags('--test', 'cool=true', '-s'); // true\r\nhasFlags('special'); // false"
         },
         "tags": [
@@ -2353,7 +2353,7 @@
         "text": "Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise.\r\n\r\nUse the [SubtleCrypto](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto) API to create a hash for the given value.",
         "codeBlocks": {
           "es6": "const hashBrowser = val =>\r\n  crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(val)).then(h => {\r\n    let hexes = [],\r\n      view = new DataView(h);\r\n    for (let i = 0; i < view.byteLength; i += 4)\r\n      hexes.push(('00000000' + view.getUint32(i).toString(16)).slice(-8));\r\n    return hexes.join('');\r\n  });",
-          "es5": "\"use strict\";\n\nvar hashBrowser = function hashBrowser(val) {\n  return crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(val)).then(function (h) {\n    var hexes = [],\n        view = new DataView(h);\n\n    for (var i = 0; i < view.byteLength; i += 4) {\n      hexes.push(('00000000' + view.getUint32(i).toString(16)).slice(-8));\n    }\n\n    return hexes.join('');\n  });\n};",
+          "es5": "var hashBrowser = function hashBrowser(val) {\n  return crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(val)).then(function (h) {\n    var hexes = [],\n        view = new DataView(h);\n\n    for (var i = 0; i < view.byteLength; i += 4) {\n      hexes.push(('00000000' + view.getUint32(i).toString(16)).slice(-8));\n    }\n\n    return hexes.join('');\n  });\n};",
           "example": "hashBrowser(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(console.log); // '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'"
         },
         "tags": [
@@ -2377,7 +2377,7 @@
         "text": "Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise.\r\n\r\nUse `crypto` API to create a hash for the given value.",
         "codeBlocks": {
           "es6": "const crypto = require('crypto');\r\nconst hashNode = val =>\r\n  new Promise(resolve =>\r\n    setTimeout(\r\n      () =>\r\n        resolve(\r\n          crypto\r\n            .createHash('sha256')\r\n            .update(val)\r\n            .digest('hex')\r\n        ),\r\n      0\r\n    )\r\n  );",
-          "es5": "\"use strict\";\n\nvar crypto = require('crypto');\n\nvar hashNode = function hashNode(val) {\n  return new Promise(function (resolve) {\n    return setTimeout(function () {\n      return resolve(crypto.createHash('sha256').update(val).digest('hex'));\n    }, 0);\n  });\n};",
+          "es5": "var crypto = require('crypto');\n\nvar hashNode = function hashNode(val) {\n  return new Promise(function (resolve) {\n    return setTimeout(function () {\n      return resolve(crypto.createHash('sha256').update(val).digest('hex'));\n    }, 0);\n  });\n};",
           "example": "hashNode(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(console.log); // '04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393'"
         },
         "tags": [
@@ -2400,7 +2400,7 @@
         "text": "Returns the head of a list.\r\n\r\nUse `arr[0]` to return the first element of the passed array.",
         "codeBlocks": {
           "es6": "const head = arr => arr[0];",
-          "es5": "\"use strict\";\n\nvar head = function head(arr) {\n  return arr[0];\n};",
+          "es5": "var head = function head(arr) {\n  return arr[0];\n};",
           "example": "head([1, 2, 3]); // 1"
         },
         "tags": [
@@ -2421,7 +2421,7 @@
         "text": "Converts a color code to a `rgb()` or `rgba()` string if alpha value is provided.\r\n\r\nUse bitwise right-shift operator and mask bits with `&` (and) operator to convert a hexadecimal color code (with or without prefixed with `#`) to a string with the RGB values. If it's 3-digit color code, first convert to 6-digit version. If an alpha value is provided alongside 6-digit hex, give `rgba()` string in return.",
         "codeBlocks": {
           "es6": "const hexToRGB = hex => {\r\n  let alpha = false,\r\n    h = hex.slice(hex.startsWith('#') ? 1 : 0);\r\n  if (h.length === 3) h = [...h].map(x => x + x).join('');\r\n  else if (h.length === 8) alpha = true;\r\n  h = parseInt(h, 16);\r\n  return (\r\n    'rgb' +\r\n    (alpha ? 'a' : '') +\r\n    '(' +\r\n    (h >>> (alpha ? 24 : 16)) +\r\n    ', ' +\r\n    ((h & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) +\r\n    ', ' +\r\n    ((h & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) +\r\n    (alpha ? `, ${h & 0x000000ff}` : '') +\r\n    ')'\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar hexToRGB = function hexToRGB(hex) {\n  var alpha = false,\n      h = hex.slice(hex.startsWith('#') ? 1 : 0);\n  if (h.length === 3) h = _toConsumableArray(h).map(function (x) {\n    return x + x;\n  }).join('');else if (h.length === 8) alpha = true;\n  h = parseInt(h, 16);\n  return 'rgb' + (alpha ? 'a' : '') + '(' + (h >>> (alpha ? 24 : 16)) + ', ' + ((h & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) + ', ' + ((h & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) + (alpha ? \", \".concat(h & 0x000000ff) : '') + ')';\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar hexToRGB = function hexToRGB(hex) {\n  var alpha = false,\n      h = hex.slice(hex.startsWith('#') ? 1 : 0);\n  if (h.length === 3) h = _toConsumableArray(h).map(function (x) {\n    return x + x;\n  }).join('');else if (h.length === 8) alpha = true;\n  h = parseInt(h, 16);\n  return 'rgb' + (alpha ? 'a' : '') + '(' + (h >>> (alpha ? 24 : 16)) + ', ' + ((h & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) + ', ' + ((h & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) + (alpha ? \", \".concat(h & 0x000000ff) : '') + ')';\n};",
           "example": "hexToRGB('#27ae60ff'); // 'rgba(39, 174, 96, 255)'\r\nhexToRGB('27ae60'); // 'rgb(39, 174, 96)'\r\nhexToRGB('#fff'); // 'rgb(255, 255, 255)'"
         },
         "tags": [
@@ -2444,7 +2444,7 @@
         "text": "Hides all the elements specified.\r\n\r\nUse `NodeList.prototype.forEach()` to apply `display: none` to each element specified.",
         "codeBlocks": {
           "es6": "const hide = els => els.forEach(e => (e.style.display = 'none'));",
-          "es5": "\"use strict\";\n\nvar hide = function hide(els) {\n  return els.forEach(function (e) {\n    return e.style.display = 'none';\n  });\n};",
+          "es5": "var hide = function hide(els) {\n  return els.forEach(function (e) {\n    return e.style.display = 'none';\n  });\n};",
           "example": "hide(document.querySelectorAll('img')); // Hides all <img> elements on the page"
         },
         "tags": [
@@ -2466,7 +2466,7 @@
         "text": "Makes a `GET` request to the passed URL.\r\n\r\nUse [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest) web api to make a `get` request to the given `url`.\r\nHandle the `onload` event, by calling the given `callback` the `responseText`.\r\nHandle the `onerror` event, by running the provided `err` function.\r\nOmit the third argument, `err`, to log errors to the console's `error` stream by default.",
         "codeBlocks": {
           "es6": "const httpGet = (url, callback, err = console.error) => {\r\n  const request = new XMLHttpRequest();\r\n  request.open('GET', url, true);\r\n  request.onload = () => callback(request.responseText);\r\n  request.onerror = () => err(request);\r\n  request.send();\r\n};",
-          "es5": "\"use strict\";\n\nvar httpGet = function httpGet(url, callback) {\n  var err = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('GET', url, true);\n\n  request.onload = function () {\n    return callback(request.responseText);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send();\n};",
+          "es5": "var httpGet = function httpGet(url, callback) {\n  var err = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('GET', url, true);\n\n  request.onload = function () {\n    return callback(request.responseText);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send();\n};",
           "example": "httpGet(\r\n  'https://jsonplaceholder.typicode.com/posts/1',\r\n  console.log\r\n); /*\r\nLogs: {\r\n  \"userId\": 1,\r\n  \"id\": 1,\r\n  \"title\": \"sunt aut facere repellat provident occaecati excepturi optio reprehenderit\",\r\n  \"body\": \"quia et suscipit\\nsuscipit recusandae consequuntur expedita et cum\\nreprehenderit molestiae ut ut quas totam\\nnostrum rerum est autem sunt rem eveniet architecto\"\r\n}\r\n*/"
         },
         "tags": [
@@ -2489,7 +2489,7 @@
         "text": "Makes a `POST` request to the passed URL.\r\n\r\nUse [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest) web api to make a `post` request to the given `url`.\r\nSet the value of an `HTTP` request header with `setRequestHeader` method.\r\nHandle the `onload` event, by calling the given `callback` the `responseText`.\r\nHandle the `onerror` event, by running the provided `err` function.\r\nOmit the third argument, `data`, to send no data to the provided `url`.\r\nOmit the fourth argument, `err`, to log errors to the console's `error` stream by default.",
         "codeBlocks": {
           "es6": "const httpPost = (url, data, callback, err = console.error) => {\r\n  const request = new XMLHttpRequest();\r\n  request.open('POST', url, true);\r\n  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');\r\n  request.onload = () => callback(request.responseText);\r\n  request.onerror = () => err(request);\r\n  request.send(data);\r\n};",
-          "es5": "\"use strict\";\n\nvar httpPost = function httpPost(url, data, callback) {\n  var err = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('POST', url, true);\n  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');\n\n  request.onload = function () {\n    return callback(request.responseText);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send(data);\n};",
+          "es5": "var httpPost = function httpPost(url, data, callback) {\n  var err = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('POST', url, true);\n  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');\n\n  request.onload = function () {\n    return callback(request.responseText);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send(data);\n};",
           "example": "const newPost = {\r\n  userId: 1,\r\n  id: 1337,\r\n  title: 'Foo',\r\n  body: 'bar bar bar'\r\n};\r\nconst data = JSON.stringify(newPost);\r\nhttpPost(\r\n  'https://jsonplaceholder.typicode.com/posts',\r\n  data,\r\n  console.log\r\n); /*\r\nLogs: {\r\n  \"userId\": 1,\r\n  \"id\": 1337,\r\n  \"title\": \"Foo\",\r\n  \"body\": \"bar bar bar\"\r\n}\r\n*/\r\nhttpPost(\r\n  'https://jsonplaceholder.typicode.com/posts',\r\n  null, // does not send a body\r\n  console.log\r\n); /*\r\nLogs: {\r\n  \"id\": 101\r\n}\r\n*/"
         },
         "tags": [
@@ -2512,7 +2512,7 @@
         "text": "Redirects the page to HTTPS if its currently in HTTP. Also, pressing the back button doesn't take it back to the HTTP page as its replaced in the history.\r\n\r\nUse `location.protocol` to get the protocol currently being used. If it's not HTTPS, use `location.replace()` to replace the existing page with the HTTPS version of the page. Use `location.href` to get the full address, split it with `String.prototype.split()` and remove the protocol part of the URL.",
         "codeBlocks": {
           "es6": "const httpsRedirect = () => {\r\n  if (location.protocol !== 'https:') location.replace('https://' + location.href.split('//')[1]);\r\n};",
-          "es5": "\"use strict\";\n\nvar httpsRedirect = function httpsRedirect() {\n  if (location.protocol !== 'https:') location.replace('https://' + location.href.split('//')[1]);\n};",
+          "es5": "var httpsRedirect = function httpsRedirect() {\n  if (location.protocol !== 'https:') location.replace('https://' + location.href.split('//')[1]);\n};",
           "example": "httpsRedirect(); // If you are on http://mydomain.com, you are redirected to https://mydomain.com"
         },
         "tags": [
@@ -2534,7 +2534,7 @@
         "text": "Returns the number of times a function executed per second. \r\n`hz` is the unit for `hertz`, the unit of frequency defined as one cycle per second.\r\n\r\nUse `performance.now()` to get the difference in milliseconds before and after the iteration loop to calculate the time elapsed executing the function `iterations` times. \r\nReturn the number of cycles per second by converting milliseconds to seconds and dividing it by the time elapsed. \r\nOmit the second argument, `iterations`, to use the default of 100 iterations.",
         "codeBlocks": {
           "es6": "const hz = (fn, iterations = 100) => {\r\n  const before = performance.now();\r\n  for (let i = 0; i < iterations; i++) fn();\r\n  return (1000 * iterations) / (performance.now() - before);\r\n};",
-          "es5": "\"use strict\";\n\nvar hz = function hz(fn) {\n  var iterations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100;\n  var before = performance.now();\n\n  for (var i = 0; i < iterations; i++) {\n    fn();\n  }\n\n  return 1000 * iterations / (performance.now() - before);\n};",
+          "es5": "var hz = function hz(fn) {\n  var iterations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 100;\n  var before = performance.now();\n\n  for (var i = 0; i < iterations; i++) {\n    fn();\n  }\n\n  return 1000 * iterations / (performance.now() - before);\n};",
           "example": "// 10,000 element array\r\nconst numbers = Array(10000)\r\n  .fill()\r\n  .map((_, i) => i);\r\n\r\n// Test functions with the same goal: sum up the elements in the array\r\nconst sumReduce = () => numbers.reduce((acc, n) => acc + n, 0);\r\nconst sumForLoop = () => {\r\n  let sum = 0;\r\n  for (let i = 0; i < numbers.length; i++) sum += numbers[i];\r\n  return sum;\r\n};\r\n\r\n// `sumForLoop` is nearly 10 times faster\r\nMath.round(hz(sumReduce)); // 572\r\nMath.round(hz(sumForLoop)); // 4784"
         },
         "tags": [
@@ -2555,7 +2555,7 @@
         "text": "Indents each line in the provided string.\r\n\r\nUse `String.replace` and a regular expression to add the character specified by `indent` `count` times at the start of each line.\r\nOmit the third parameter, `indent`, to use a default indentation character of `' '`.",
         "codeBlocks": {
           "es6": "const indentString = (str, count, indent = ' ') => str.replace(/^/gm, indent.repeat(count));",
-          "es5": "\"use strict\";\n\nvar indentString = function indentString(str, count) {\n  var indent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ' ';\n  return str.replace(/^/gm, indent.repeat(count));\n};",
+          "es5": "var indentString = function indentString(str, count) {\n  var indent = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ' ';\n  return str.replace(/^/gm, indent.repeat(count));\n};",
           "example": "indentString('Lorem\\nIpsum', 2); // '  Lorem\\n  Ipsum'\r\nindentString('Lorem\\nIpsum', 2, '_'); // '__Lorem\\n__Ipsum'"
         },
         "tags": [
@@ -2577,7 +2577,7 @@
         "text": "Returns all indices of `val` in an array.\r\nIf `val` never occurs, returns `[]`.\r\n\r\nUse `Array.prototype.reduce()` to loop over elements and store indices for matching elements.\r\nReturn the array of indices.",
         "codeBlocks": {
           "es6": "const indexOfAll = (arr, val) => arr.reduce((acc, el, i) => (el === val ? [...acc, i] : acc), []);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar indexOfAll = function indexOfAll(arr, val) {\n  return arr.reduce(function (acc, el, i) {\n    return el === val ? _toConsumableArray(acc).concat([i]) : acc;\n  }, []);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar indexOfAll = function indexOfAll(arr, val) {\n  return arr.reduce(function (acc, el, i) {\n    return el === val ? _toConsumableArray(acc).concat([i]) : acc;\n  }, []);\n};",
           "example": "indexOfAll([1, 2, 3, 1, 2, 3], 1); // [0,3]\r\nindexOfAll([1, 2, 3], 4); // []"
         },
         "tags": [
@@ -2598,7 +2598,7 @@
         "text": "Returns all the elements of an array except the last one.\r\n\r\nUse `arr.slice(0,-1)` to return all but the last element of the array.",
         "codeBlocks": {
           "es6": "const initial = arr => arr.slice(0, -1);",
-          "es5": "\"use strict\";\n\nvar initial = function initial(arr) {\n  return arr.slice(0, -1);\n};",
+          "es5": "var initial = function initial(arr) {\n  return arr.slice(0, -1);\n};",
           "example": "initial([1, 2, 3]); // [1,2]"
         },
         "tags": [
@@ -2619,7 +2619,7 @@
         "text": "Initializes a 2D array of given width and height and value.\r\n\r\nUse `Array.prototype.map()` to generate h rows where each is a new array of size w initialize with value. If the value is not provided, default to `null`.",
         "codeBlocks": {
           "es6": "const initialize2DArray = (w, h, val = null) =>\r\n  Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));",
-          "es5": "\"use strict\";\n\nvar initialize2DArray = function initialize2DArray(w, h) {\n  var val = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;\n  return Array.from({\n    length: h\n  }).map(function () {\n    return Array.from({\n      length: w\n    }).fill(val);\n  });\n};",
+          "es5": "var initialize2DArray = function initialize2DArray(w, h) {\n  var val = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;\n  return Array.from({\n    length: h\n  }).map(function () {\n    return Array.from({\n      length: w\n    }).fill(val);\n  });\n};",
           "example": "initialize2DArray(2, 2, 0); // [[0,0], [0,0]]"
         },
         "tags": [
@@ -2640,7 +2640,7 @@
         "text": "Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive with their common difference `step`.\r\n\r\nUse `Array.from()` to create an array of the desired length, `(end - start + 1)/step`, and a map function to fill it with the desired values in the given range.\r\nYou can omit `start` to use a default value of `0`.\r\nYou can omit `step` to use a default value of `1`.",
         "codeBlocks": {
           "es6": "const initializeArrayWithRange = (end, start = 0, step = 1) =>\r\n  Array.from({ length: Math.ceil((end - start + 1) / step) }, (v, i) => i * step + start);",
-          "es5": "\"use strict\";\n\nvar initializeArrayWithRange = function initializeArrayWithRange(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: Math.ceil((end - start + 1) / step)\n  }, function (v, i) {\n    return i * step + start;\n  });\n};",
+          "es5": "var initializeArrayWithRange = function initializeArrayWithRange(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: Math.ceil((end - start + 1) / step)\n  }, function (v, i) {\n    return i * step + start;\n  });\n};",
           "example": "initializeArrayWithRange(5); // [0,1,2,3,4,5]\r\ninitializeArrayWithRange(7, 3); // [3,4,5,6,7]\r\ninitializeArrayWithRange(9, 0, 2); // [0,2,4,6,8]"
         },
         "tags": [
@@ -2662,7 +2662,7 @@
         "text": "Initializes an array containing the numbers in the specified range (in reverse) where `start` and `end` are inclusive with their common difference `step`.\r\n\r\nUse `Array.from(Math.ceil((end+1-start)/step))` to create an array of the desired length(the amounts of elements is equal to `(end-start)/step` or `(end+1-start)/step` for inclusive end), `Array.prototype.map()` to fill with the desired values in a range.\r\nYou can omit `start` to use a default value of `0`.\r\nYou can omit `step` to use a default value of `1`.",
         "codeBlocks": {
           "es6": "const initializeArrayWithRangeRight = (end, start = 0, step = 1) =>\r\n  Array.from({ length: Math.ceil((end + 1 - start) / step) }).map(\r\n    (v, i, arr) => (arr.length - i - 1) * step + start\r\n  );",
-          "es5": "\"use strict\";\n\nvar initializeArrayWithRangeRight = function initializeArrayWithRangeRight(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: Math.ceil((end + 1 - start) / step)\n  }).map(function (v, i, arr) {\n    return (arr.length - i - 1) * step + start;\n  });\n};",
+          "es5": "var initializeArrayWithRangeRight = function initializeArrayWithRangeRight(end) {\n  var start = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var step = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: Math.ceil((end + 1 - start) / step)\n  }).map(function (v, i, arr) {\n    return (arr.length - i - 1) * step + start;\n  });\n};",
           "example": "initializeArrayWithRangeRight(5); // [5,4,3,2,1,0]\r\ninitializeArrayWithRangeRight(7, 3); // [7,6,5,4,3]\r\ninitializeArrayWithRangeRight(9, 0, 2); // [8,6,4,2,0]"
         },
         "tags": [
@@ -2684,7 +2684,7 @@
         "text": "Initializes and fills an array with the specified values.\r\n\r\nUse `Array(n)` to create an array of the desired length, `fill(v)` to fill it with the desired values.\r\nYou can omit `val` to use a default value of `0`.",
         "codeBlocks": {
           "es6": "const initializeArrayWithValues = (n, val = 0) => Array(n).fill(val);",
-          "es5": "\"use strict\";\n\nvar initializeArrayWithValues = function initializeArrayWithValues(n) {\n  var val = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return Array(n).fill(val);\n};",
+          "es5": "var initializeArrayWithValues = function initializeArrayWithValues(n) {\n  var val = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return Array(n).fill(val);\n};",
           "example": "initializeArrayWithValues(5, 2); // [2, 2, 2, 2, 2]"
         },
         "tags": [
@@ -2706,7 +2706,7 @@
         "text": "Create a n-dimensional array with given value.\r\n\r\nUse recursion.\r\nUse `Array.prototype.map()` to generate rows where each is a new array initialized using `initializeNDArray`.",
         "codeBlocks": {
           "es6": "const initializeNDArray = (val, ...args) =>\r\n  args.length === 0\r\n    ? val\r\n    : Array.from({ length: args[0] }).map(() => initializeNDArray(val, ...args.slice(1)));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar initializeNDArray = function initializeNDArray(val) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return args.length === 0 ? val : Array.from({\n    length: args[0]\n  }).map(function () {\n    return initializeNDArray.apply(void 0, [val].concat(_toConsumableArray(args.slice(1))));\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar initializeNDArray = function initializeNDArray(val) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return args.length === 0 ? val : Array.from({\n    length: args[0]\n  }).map(function () {\n    return initializeNDArray.apply(void 0, [val].concat(_toConsumableArray(args.slice(1))));\n  });\n};",
           "example": "initializeNDArray(1, 3); // [1,1,1]\r\ninitializeNDArray(5, 2, 2, 2); // [[[5,5],[5,5]],[[5,5],[5,5]]]"
         },
         "tags": [
@@ -2728,7 +2728,7 @@
         "text": "Checks if the given number falls within the given range.\r\n\r\nUse arithmetic comparison to check if the given number is in the specified range.\r\nIf the second parameter, `end`, is not specified, the range is considered to be from `0` to `start`.",
         "codeBlocks": {
           "es6": "const inRange = (n, start, end = null) => {\r\n  if (end && start > end) [end, start] = [start, end];\r\n  return end == null ? n >= 0 && n < start : n >= start && n < end;\r\n};",
-          "es5": "\"use strict\";\n\nvar inRange = function inRange(n, start) {\n  var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;\n\n  if (end && start > end) {\n    var _ref = [start, end];\n    end = _ref[0];\n    start = _ref[1];\n  }\n\n  return end == null ? n >= 0 && n < start : n >= start && n < end;\n};",
+          "es5": "var inRange = function inRange(n, start) {\n  var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : null;\n\n  if (end && start > end) {\n    var _ref = [start, end];\n    end = _ref[0];\n    start = _ref[1];\n  }\n\n  return end == null ? n >= 0 && n < start : n >= start && n < end;\n};",
           "example": "inRange(3, 2, 5); // true\r\ninRange(3, 4); // true\r\ninRange(2, 3, 5); // false\r\ninRange(3, 2); // false"
         },
         "tags": [
@@ -2749,7 +2749,7 @@
         "text": "Inserts an HTML string after the end of the specified element.\r\n\r\nUse `el.insertAdjacentHTML()` with a position of `'afterend'` to parse `htmlString` and insert it after the end of `el`.",
         "codeBlocks": {
           "es6": "const insertAfter = (el, htmlString) => el.insertAdjacentHTML('afterend', htmlString);",
-          "es5": "\"use strict\";\n\nvar insertAfter = function insertAfter(el, htmlString) {\n  return el.insertAdjacentHTML('afterend', htmlString);\n};",
+          "es5": "var insertAfter = function insertAfter(el, htmlString) {\n  return el.insertAdjacentHTML('afterend', htmlString);\n};",
           "example": "insertAfter(document.getElementById('myId'), '<p>after</p>'); // <div id=\"myId\">...</div> <p>after</p>"
         },
         "tags": [
@@ -2770,7 +2770,7 @@
         "text": "Inserts an HTML string before the start of the specified element.\r\n\r\nUse `el.insertAdjacentHTML()` with a position of `'beforebegin'` to parse `htmlString` and insert it before the start of `el`.",
         "codeBlocks": {
           "es6": "const insertBefore = (el, htmlString) => el.insertAdjacentHTML('beforebegin', htmlString);",
-          "es5": "\"use strict\";\n\nvar insertBefore = function insertBefore(el, htmlString) {\n  return el.insertAdjacentHTML('beforebegin', htmlString);\n};",
+          "es5": "var insertBefore = function insertBefore(el, htmlString) {\n  return el.insertAdjacentHTML('beforebegin', htmlString);\n};",
           "example": "insertBefore(document.getElementById('myId'), '<p>before</p>'); // <p>before</p> <div id=\"myId\">...</div>"
         },
         "tags": [
@@ -2791,7 +2791,7 @@
         "text": "Returns a list of elements that exist in both arrays.\r\n\r\nCreate a `Set` from `b`, then use `Array.prototype.filter()` on `a` to only keep values contained in `b`.",
         "codeBlocks": {
           "es6": "const intersection = (a, b) => {\r\n  const s = new Set(b);\r\n  return a.filter(x => s.has(x));\r\n};",
-          "es5": "\"use strict\";\n\nvar intersection = function intersection(a, b) {\n  var s = new Set(b);\n  return a.filter(function (x) {\n    return s.has(x);\n  });\n};",
+          "es5": "var intersection = function intersection(a, b) {\n  var s = new Set(b);\n  return a.filter(function (x) {\n    return s.has(x);\n  });\n};",
           "example": "intersection([1, 2, 3], [4, 3, 2]); // [2, 3]"
         },
         "tags": [
@@ -2813,7 +2813,7 @@
         "text": "Returns a list of elements that exist in both arrays, after applying the provided function to each array element of both.\r\n\r\nCreate a `Set` by applying `fn` to all elements in `b`, then use `Array.prototype.filter()` on `a` to only keep elements, which produce values contained in `b` when `fn` is applied to them.",
         "codeBlocks": {
           "es6": "const intersectionBy = (a, b, fn) => {\r\n  const s = new Set(b.map(fn));\r\n  return a.filter(x => s.has(fn(x)));\r\n};",
-          "es5": "\"use strict\";\n\nvar intersectionBy = function intersectionBy(a, b, fn) {\n  var s = new Set(b.map(fn));\n  return a.filter(function (x) {\n    return s.has(fn(x));\n  });\n};",
+          "es5": "var intersectionBy = function intersectionBy(a, b, fn) {\n  var s = new Set(b.map(fn));\n  return a.filter(function (x) {\n    return s.has(fn(x));\n  });\n};",
           "example": "intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor); // [2.1]"
         },
         "tags": [
@@ -2835,7 +2835,7 @@
         "text": "Returns a list of elements that exist in both arrays, using a provided comparator function.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.findIndex()` in combination with the provided comparator to determine intersecting values.",
         "codeBlocks": {
           "es6": "const intersectionWith = (a, b, comp) => a.filter(x => b.findIndex(y => comp(x, y)) !== -1);",
-          "es5": "\"use strict\";\n\nvar intersectionWith = function intersectionWith(a, b, comp) {\n  return a.filter(function (x) {\n    return b.findIndex(function (y) {\n      return comp(x, y);\n    }) !== -1;\n  });\n};",
+          "es5": "var intersectionWith = function intersectionWith(a, b, comp) {\n  return a.filter(function (x) {\n    return b.findIndex(function (y) {\n      return comp(x, y);\n    }) !== -1;\n  });\n};",
           "example": "intersectionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)); // [1.5, 3, 0]"
         },
         "tags": [
@@ -2857,7 +2857,7 @@
         "text": "Inverts the key-value pairs of an object, without mutating it. The corresponding inverted value of each inverted key is an array of keys responsible for generating the inverted value. If a function is supplied, it is applied to each inverted key.\r\n\r\nUse `Object.keys()` and `Array.prototype.reduce()` to invert the key-value pairs of an object and apply the function provided (if any).\r\nOmit the second argument, `fn`, to get the inverted keys without applying a function to them.",
         "codeBlocks": {
           "es6": "const invertKeyValues = (obj, fn) =>\r\n  Object.keys(obj).reduce((acc, key) => {\r\n    const val = fn ? fn(obj[key]) : obj[key];\r\n    acc[val] = acc[val] || [];\r\n    acc[val].push(key);\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar invertKeyValues = function invertKeyValues(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    var val = fn ? fn(obj[key]) : obj[key];\n    acc[val] = acc[val] || [];\n    acc[val].push(key);\n    return acc;\n  }, {});\n};",
+          "es5": "var invertKeyValues = function invertKeyValues(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    var val = fn ? fn(obj[key]) : obj[key];\n    acc[val] = acc[val] || [];\n    acc[val].push(key);\n    return acc;\n  }, {});\n};",
           "example": "invertKeyValues({ a: 1, b: 2, c: 1 }); // { 1: [ 'a', 'c' ], 2: [ 'b' ] }\r\ninvertKeyValues({ a: 1, b: 2, c: 1 }, value => 'group' + value); // { group1: [ 'a', 'c' ], group2: [ 'b' ] }"
         },
         "tags": [
@@ -2879,7 +2879,7 @@
         "text": "Checks if the provided value is of the specified type.\r\n\r\nEnsure the value is not `undefined` or `null` using `Array.prototype.includes()`, and compare the `constructor` property on the value with `type` to check if the provided value is of the specified `type`.",
         "codeBlocks": {
           "es6": "const is = (type, val) => ![, null].includes(val) && val.constructor === type;",
-          "es5": "\"use strict\";\n\nvar is = function is(type, val) {\n  return ![, null].includes(val) && val.constructor === type;\n};",
+          "es5": "var is = function is(type, val) {\n  return ![, null].includes(val) && val.constructor === type;\n};",
           "example": "is(Array, [1]); // true\r\nis(ArrayBuffer, new ArrayBuffer()); // true\r\nis(Map, new Map()); // true\r\nis(RegExp, /./g); // true\r\nis(Set, new Set()); // true\r\nis(WeakMap, new WeakMap()); // true\r\nis(WeakSet, new WeakSet()); // true\r\nis(String, ''); // true\r\nis(String, new String('')); // true\r\nis(Number, 1); // true\r\nis(Number, new Number(1)); // true\r\nis(Boolean, true); // true\r\nis(Boolean, new Boolean(true)); // true"
         },
         "tags": [
@@ -2902,7 +2902,7 @@
         "text": "Returns `true` if the given string is an absolute URL, `false` otherwise.\r\n\r\nUse a regular expression to test if the string is an absolute URL.",
         "codeBlocks": {
           "es6": "const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);",
-          "es5": "\"use strict\";\n\nvar isAbsoluteURL = function isAbsoluteURL(str) {\n  return /^[a-z][a-z0-9+.-]*:/.test(str);\n};",
+          "es5": "var isAbsoluteURL = function isAbsoluteURL(str) {\n  return /^[a-z][a-z0-9+.-]*:/.test(str);\n};",
           "example": "isAbsoluteURL('https://google.com'); // true\r\nisAbsoluteURL('ftp://www.myserver.net'); // true\r\nisAbsoluteURL('/foo/bar'); // false"
         },
         "tags": [
@@ -2926,7 +2926,7 @@
         "text": "Check if a date is after another date.\r\n\r\nUse the greater than operator (`>`) to check if the first date comes after the second one.",
         "codeBlocks": {
           "es6": "const isAfterDate = (dateA, dateB) => dateA > dateB;",
-          "es5": "\"use strict\";\n\nvar isAfterDate = function isAfterDate(dateA, dateB) {\n  return dateA > dateB;\n};",
+          "es5": "var isAfterDate = function isAfterDate(dateA, dateB) {\n  return dateA > dateB;\n};",
           "example": "isAfterDate(new Date(2010, 10, 21), new Date(2010, 10, 20)); // true"
         },
         "tags": [
@@ -2948,7 +2948,7 @@
         "text": "Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters).\r\n\r\nUse `String.toLowerCase()`, `String.prototype.replace()` with an appropriate regular expression to remove unnecessary characters, `String.prototype.split('')`, `Array.prototype.sort()` and `Array.prototype.join('')` on both strings to normalize them, then check if their normalized forms are equal.",
         "codeBlocks": {
           "es6": "const isAnagram = (str1, str2) => {\r\n  const normalize = str =>\r\n    str\r\n      .toLowerCase()\r\n      .replace(/[^a-z0-9]/gi, '')\r\n      .split('')\r\n      .sort()\r\n      .join('');\r\n  return normalize(str1) === normalize(str2);\r\n};",
-          "es5": "\"use strict\";\n\nvar isAnagram = function isAnagram(str1, str2) {\n  var normalize = function normalize(str) {\n    return str.toLowerCase().replace(/[^a-z0-9]/gi, '').split('').sort().join('');\n  };\n\n  return normalize(str1) === normalize(str2);\n};",
+          "es5": "var isAnagram = function isAnagram(str1, str2) {\n  var normalize = function normalize(str) {\n    return str.toLowerCase().replace(/[^a-z0-9]/gi, '').split('').sort().join('');\n  };\n\n  return normalize(str1) === normalize(str2);\n};",
           "example": "isAnagram('iceman', 'cinema'); // true"
         },
         "tags": [
@@ -2970,7 +2970,7 @@
         "text": "Checks if the provided argument is array-like (i.e. is iterable).\r\n\r\nCheck if the provided argument is not `null` and that its `Symbol.iterator` property is a function.",
         "codeBlocks": {
           "es6": "const isArrayLike = obj => obj != null && typeof obj[Symbol.iterator] === 'function';",
-          "es5": "\"use strict\";\n\nvar isArrayLike = function isArrayLike(obj) {\n  return obj != null && typeof obj[Symbol.iterator] === 'function';\n};",
+          "es5": "var isArrayLike = function isArrayLike(obj) {\n  return obj != null && typeof obj[Symbol.iterator] === 'function';\n};",
           "example": "isArrayLike(document.querySelectorAll('.className')); // true\r\nisArrayLike('abc'); // true\r\nisArrayLike(null); // false"
         },
         "tags": [
@@ -2992,7 +2992,7 @@
         "text": "Check if a date is before another date.\r\n\r\nUse the less than operator (`<`) to check if the first date comes before the second one.",
         "codeBlocks": {
           "es6": "const isBeforeDate = (dateA, dateB) => dateA < dateB;",
-          "es5": "\"use strict\";\n\nvar isBeforeDate = function isBeforeDate(dateA, dateB) {\n  return dateA < dateB;\n};",
+          "es5": "var isBeforeDate = function isBeforeDate(dateA, dateB) {\n  return dateA < dateB;\n};",
           "example": "isBeforeDate(new Date(2010, 10, 20), new Date(2010, 10, 21)); // true"
         },
         "tags": [
@@ -3014,7 +3014,7 @@
         "text": "Checks if the given argument is a native boolean element.\r\n\r\nUse `typeof` to check if a value is classified as a boolean primitive.",
         "codeBlocks": {
           "es6": "const isBoolean = val => typeof val === 'boolean';",
-          "es5": "\"use strict\";\n\nvar isBoolean = function isBoolean(val) {\n  return typeof val === 'boolean';\n};",
+          "es5": "var isBoolean = function isBoolean(val) {\n  return typeof val === 'boolean';\n};",
           "example": "isBoolean(null); // false\r\nisBoolean(false); // true"
         },
         "tags": [
@@ -3035,7 +3035,7 @@
         "text": "Determines if the current runtime environment is a browser so that front-end modules can run on the server (Node) without throwing errors.\r\n\r\nUse `Array.prototype.includes()` on the `typeof` values of both `window` and `document` (globals usually only available in a browser environment unless they were explicitly defined), which will return `true` if one of them is `undefined`.\r\n`typeof` allows globals to be checked for existence without throwing a `ReferenceError`.\r\nIf both of them are not `undefined`, then the current environment is assumed to be a browser.",
         "codeBlocks": {
           "es6": "const isBrowser = () => ![typeof window, typeof document].includes('undefined');",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isBrowser = function isBrowser() {\n  return ![typeof window === \"undefined\" ? \"undefined\" : _typeof(window), typeof document === \"undefined\" ? \"undefined\" : _typeof(document)].includes('undefined');\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isBrowser = function isBrowser() {\n  return ![typeof window === \"undefined\" ? \"undefined\" : _typeof(window), typeof document === \"undefined\" ? \"undefined\" : _typeof(document)].includes('undefined');\n};",
           "example": "isBrowser(); // true (browser)\r\nisBrowser(); // false (Node)"
         },
         "tags": [
@@ -3057,7 +3057,7 @@
         "text": "Returns `true` if the browser tab of the page is focused, `false` otherwise.\r\n\r\nUse the `Document.hidden` property, introduced by the Page Visibility API to check if the browser tab of the page is visible or hidden.",
         "codeBlocks": {
           "es6": "const isBrowserTabFocused = () => !document.hidden;",
-          "es5": "\"use strict\";\n\nvar isBrowserTabFocused = function isBrowserTabFocused() {\n  return !document.hidden;\n};",
+          "es5": "var isBrowserTabFocused = function isBrowserTabFocused() {\n  return !document.hidden;\n};",
           "example": "isBrowserTabFocused(); // true"
         },
         "tags": [
@@ -3078,7 +3078,7 @@
         "text": "Checks if the first numeric argument is divisible by the second one.\r\n\r\nUse the modulo operator (`%`) to check if the remainder is equal to `0`.",
         "codeBlocks": {
           "es6": "const isDivisible = (dividend, divisor) => dividend % divisor === 0;",
-          "es5": "\"use strict\";\n\nvar isDivisible = function isDivisible(dividend, divisor) {\n  return dividend % divisor === 0;\n};",
+          "es5": "var isDivisible = function isDivisible(dividend, divisor) {\n  return dividend % divisor === 0;\n};",
           "example": "isDivisible(6, 3); // true"
         },
         "tags": [
@@ -3099,7 +3099,7 @@
         "text": "Checks if the given argument is a duplex (readable and writable) stream.\r\n\r\nCheck if the value is different from `null`, use `typeof` to check if a value is of type `object` and the `pipe` property is of type `function`.\r\nAdditionally check if the `typeof` the `_read`, `_write` and `_readableState`, `_writableState` properties are `function` and `object` respectively.",
         "codeBlocks": {
           "es6": "const isDuplexStream = val =>\r\n  val !== null &&\r\n  typeof val === 'object' &&\r\n  typeof val.pipe === 'function' &&\r\n  typeof val._read === 'function' &&\r\n  typeof val._readableState === 'object' &&\r\n  typeof val._write === 'function' &&\r\n  typeof val._writableState === 'object';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isDuplexStream = function isDuplexStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._read === 'function' && _typeof(val._readableState) === 'object' && typeof val._write === 'function' && _typeof(val._writableState) === 'object';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isDuplexStream = function isDuplexStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._read === 'function' && _typeof(val._readableState) === 'object' && typeof val._write === 'function' && _typeof(val._writableState) === 'object';\n};",
           "example": "const Stream = require('stream');\r\nisDuplexStream(new Stream.Duplex()); // true"
         },
         "tags": [
@@ -3121,7 +3121,7 @@
         "text": "Returns true if the a value is an empty object, collection, map or set, has no enumerable properties or is any type that is not considered a collection.\r\n\r\nCheck if the provided value is `null` or if its `length` is equal to `0`.",
         "codeBlocks": {
           "es6": "const isEmpty = val => val == null || !(Object.keys(val) || val).length;",
-          "es5": "\"use strict\";\n\nvar isEmpty = function isEmpty(val) {\n  return val == null || !(Object.keys(val) || val).length;\n};",
+          "es5": "var isEmpty = function isEmpty(val) {\n  return val == null || !(Object.keys(val) || val).length;\n};",
           "example": "isEmpty(new Map()); // true\r\nisEmpty(new Set()); // true\r\nisEmpty([]); // true\r\nisEmpty({}); // true\r\nisEmpty(''); // true\r\nisEmpty([1, 2]); // false\r\nisEmpty({ a: 1, b: 2 }); // false\r\nisEmpty('text'); // false\r\nisEmpty(123); // true - type is not considered a collection\r\nisEmpty(true); // true - type is not considered a collection"
         },
         "tags": [
@@ -3145,7 +3145,7 @@
         "text": "Returns `true` if the given number is even, `false` otherwise.\r\n\r\nChecks whether a number is odd or even using the modulo (`%`) operator.\r\nReturns `true` if the number is even, `false` if the number is odd.",
         "codeBlocks": {
           "es6": "const isEven = num => num % 2 === 0;",
-          "es5": "\"use strict\";\n\nvar isEven = function isEven(num) {\n  return num % 2 === 0;\n};",
+          "es5": "var isEven = function isEven(num) {\n  return num % 2 === 0;\n};",
           "example": "isEven(3); // false"
         },
         "tags": [
@@ -3166,7 +3166,7 @@
         "text": "Checks if the given argument is a function.\r\n\r\nUse `typeof` to check if a value is classified as a function primitive.",
         "codeBlocks": {
           "es6": "const isFunction = val => typeof val === 'function';",
-          "es5": "\"use strict\";\n\nvar isFunction = function isFunction(val) {\n  return typeof val === 'function';\n};",
+          "es5": "var isFunction = function isFunction(val) {\n  return typeof val === 'function';\n};",
           "example": "isFunction('x'); // false\r\nisFunction(x => x); // true"
         },
         "tags": [
@@ -3188,7 +3188,7 @@
         "text": "Checks if a string is lower case.\r\n\r\nConvert the given string to lower case, using `String.toLowerCase()` and compare it to the original.",
         "codeBlocks": {
           "es6": "const isLowerCase = str => str === str.toLowerCase();",
-          "es5": "\"use strict\";\n\nvar isLowerCase = function isLowerCase(str) {\n  return str === str.toLowerCase();\n};",
+          "es5": "var isLowerCase = function isLowerCase(str) {\n  return str === str.toLowerCase();\n};",
           "example": "isLowerCase('abc'); // true\r\nisLowerCase('a3@$'); // true\r\nisLowerCase('Ab4'); // false"
         },
         "tags": [
@@ -3210,7 +3210,7 @@
         "text": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.\r\n\r\nUse the strict equality operator to check if the value and of `val` are equal to `null` or `undefined`.",
         "codeBlocks": {
           "es6": "const isNil = val => val === undefined || val === null;",
-          "es5": "\"use strict\";\n\nvar isNil = function isNil(val) {\n  return val === undefined || val === null;\n};",
+          "es5": "var isNil = function isNil(val) {\n  return val === undefined || val === null;\n};",
           "example": "isNil(null); // true\r\nisNil(undefined); // true"
         },
         "tags": [
@@ -3231,7 +3231,7 @@
         "text": "Returns `true` if the specified value is `null`, `false` otherwise.\r\n\r\nUse the strict equality operator to check if the value and of `val` are equal to `null`.",
         "codeBlocks": {
           "es6": "const isNull = val => val === null;",
-          "es5": "\"use strict\";\n\nvar isNull = function isNull(val) {\n  return val === null;\n};",
+          "es5": "var isNull = function isNull(val) {\n  return val === null;\n};",
           "example": "isNull(null); // true"
         },
         "tags": [
@@ -3252,7 +3252,7 @@
         "text": "Checks if the given argument is a number.\r\n\r\nUse `typeof` to check if a value is classified as a number primitive.",
         "codeBlocks": {
           "es6": "const isNumber = val => typeof val === 'number';",
-          "es5": "\"use strict\";\n\nvar isNumber = function isNumber(val) {\n  return typeof val === 'number';\n};",
+          "es5": "var isNumber = function isNumber(val) {\n  return typeof val === 'number';\n};",
           "example": "isNumber('1'); // false\r\nisNumber(1); // true"
         },
         "tags": [
@@ -3274,7 +3274,7 @@
         "text": "Returns a boolean determining if the passed value is an object or not.\r\n\r\nUses the  `Object` constructor to create an object wrapper for the given value. \r\nIf the value is `null` or `undefined`, create and return an empty object. Οtherwise, return an object of a type that corresponds to the given value.",
         "codeBlocks": {
           "es6": "const isObject = obj => obj === Object(obj);",
-          "es5": "\"use strict\";\n\nvar isObject = function isObject(obj) {\n  return obj === Object(obj);\n};",
+          "es5": "var isObject = function isObject(obj) {\n  return obj === Object(obj);\n};",
           "example": "isObject([1, 2, 3, 4]); // true\r\nisObject([]); // true\r\nisObject(['Hello!']); // true\r\nisObject({ a: 1 }); // true\r\nisObject({}); // true\r\nisObject(true); // false"
         },
         "tags": [
@@ -3296,7 +3296,7 @@
         "text": "Checks if a value is object-like.\r\n\r\nCheck if the provided value is not `null` and its `typeof` is equal to `'object'`.",
         "codeBlocks": {
           "es6": "const isObjectLike = val => val !== null && typeof val === 'object';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isObjectLike = function isObjectLike(val) {\n  return val !== null && _typeof(val) === 'object';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isObjectLike = function isObjectLike(val) {\n  return val !== null && _typeof(val) === 'object';\n};",
           "example": "isObjectLike({}); // true\r\nisObjectLike([1, 2, 3]); // true\r\nisObjectLike(x => x); // false\r\nisObjectLike(null); // false"
         },
         "tags": [
@@ -3318,7 +3318,7 @@
         "text": "Checks if the provided value is an object created by the Object constructor.\r\n\r\nCheck if the provided value is truthy, use `typeof` to check if it is an object and `Object.constructor` to make sure the constructor is equal to `Object`.",
         "codeBlocks": {
           "es6": "const isPlainObject = val => !!val && typeof val === 'object' && val.constructor === Object;",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isPlainObject = function isPlainObject(val) {\n  return !!val && _typeof(val) === 'object' && val.constructor === Object;\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isPlainObject = function isPlainObject(val) {\n  return !!val && _typeof(val) === 'object' && val.constructor === Object;\n};",
           "example": "isPlainObject({ a: 1 }); // true\r\nisPlainObject(new Map()); // false"
         },
         "tags": [
@@ -3340,7 +3340,7 @@
         "text": "Checks if the provided integer is a prime number.\r\n\r\nCheck numbers from `2` to the square root of the given number.\r\nReturn `false` if any of them divides the given number, else return `true`, unless the number is less than `2`.",
         "codeBlocks": {
           "es6": "const isPrime = num => {\r\n  const boundary = Math.floor(Math.sqrt(num));\r\n  for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;\r\n  return num >= 2;\r\n};",
-          "es5": "\"use strict\";\n\nvar isPrime = function isPrime(num) {\n  var boundary = Math.floor(Math.sqrt(num));\n\n  for (var i = 2; i <= boundary; i++) {\n    if (num % i === 0) return false;\n  }\n\n  return num >= 2;\n};",
+          "es5": "var isPrime = function isPrime(num) {\n  var boundary = Math.floor(Math.sqrt(num));\n\n  for (var i = 2; i <= boundary; i++) {\n    if (num % i === 0) return false;\n  }\n\n  return num >= 2;\n};",
           "example": "isPrime(11); // true"
         },
         "tags": [
@@ -3362,7 +3362,7 @@
         "text": "Returns a boolean determining if the passed value is primitive or not.\r\n\r\nCreate an object from `val` and compare it with `val` to determine if the passed value is primitive (i.e. not equal to the created object).",
         "codeBlocks": {
           "es6": "const isPrimitive = val => Object(val) !== val;",
-          "es5": "\"use strict\";\n\nvar isPrimitive = function isPrimitive(val) {\n  return Object(val) !== val;\n};",
+          "es5": "var isPrimitive = function isPrimitive(val) {\n  return Object(val) !== val;\n};",
           "example": "isPrimitive(null); // true\r\nisPrimitive(50); // true\r\nisPrimitive('Hello!'); // true\r\nisPrimitive(false); // true\r\nisPrimitive(Symbol()); // true\r\nisPrimitive([]); // false"
         },
         "tags": [
@@ -3386,7 +3386,7 @@
         "text": "Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.\r\n\r\nCheck if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`.",
         "codeBlocks": {
           "es6": "const isPromiseLike = obj =>\r\n  obj !== null &&\r\n  (typeof obj === 'object' || typeof obj === 'function') &&\r\n  typeof obj.then === 'function';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isPromiseLike = function isPromiseLike(obj) {\n  return obj !== null && (_typeof(obj) === 'object' || typeof obj === 'function') && typeof obj.then === 'function';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isPromiseLike = function isPromiseLike(obj) {\n  return obj !== null && (_typeof(obj) === 'object' || typeof obj === 'function') && typeof obj.then === 'function';\n};",
           "example": "isPromiseLike({\r\n  then: function() {\r\n    return '';\r\n  }\r\n}); // true\r\nisPromiseLike(null); // false\r\nisPromiseLike({}); // false"
         },
         "tags": [
@@ -3409,7 +3409,7 @@
         "text": "Checks if the given argument is a readable stream.\r\n\r\nCheck if the value is different from `null`, use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.\r\nAdditionally check if the `typeof` the `_read` and `_readableState` properties are `function` and `object` respectively.",
         "codeBlocks": {
           "es6": "const isReadableStream = val =>\r\n  val !== null &&\r\n  typeof val === 'object' &&\r\n  typeof val.pipe === 'function' &&\r\n  typeof val._read === 'function' &&\r\n  typeof val._readableState === 'object';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isReadableStream = function isReadableStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._read === 'function' && _typeof(val._readableState) === 'object';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isReadableStream = function isReadableStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._read === 'function' && _typeof(val._readableState) === 'object';\n};",
           "example": "const fs = require('fs');\r\nisReadableStream(fs.createReadStream('test.txt')); // true"
         },
         "tags": [
@@ -3431,7 +3431,7 @@
         "text": "Check if a date is the same as another date.\r\n\r\nUse `Date.prototype.toISOString()` and strict equality checking (`===`) to check if the first date is the same as the second one.",
         "codeBlocks": {
           "es6": "const isSameDate = (dateA, dateB) => dateA.toISOString() === dateB.toISOString();",
-          "es5": "\"use strict\";\n\nvar isSameDate = function isSameDate(dateA, dateB) {\n  return dateA.toISOString() === dateB.toISOString();\n};",
+          "es5": "var isSameDate = function isSameDate(dateA, dateB) {\n  return dateA.toISOString() === dateB.toISOString();\n};",
           "example": "isSameDate(new Date(2010, 10, 20), new Date(2010, 10, 20)); // true"
         },
         "tags": [
@@ -3453,7 +3453,7 @@
         "text": "Returns `1` if the array is sorted in ascending order, `-1` if it is sorted in descending order or `0` if it is not sorted.\r\n\r\nCalculate the ordering `direction` for the first two elements.\r\nUse `Object.entries()` to loop over array objects and compare them in pairs.\r\nReturn `0` if the `direction` changes or the `direction` if the last element is reached.",
         "codeBlocks": {
           "es6": "const isSorted = arr => {\r\n  let direction = -(arr[0] - arr[1]);\r\n  for (let [i, val] of arr.entries()) {\r\n    direction = !direction ? -(arr[i - 1] - arr[i]) : direction;\r\n    if (i === arr.length - 1) return !direction ? 0 : direction;\r\n    else if ((val - arr[i + 1]) * direction > 0) return 0;\r\n  }\r\n};",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar isSorted = function isSorted(arr) {\n  var direction = -(arr[0] - arr[1]);\n  var _iteratorNormalCompletion = true;\n  var _didIteratorError = false;\n  var _iteratorError = undefined;\n\n  try {\n    for (var _iterator = arr.entries()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n      var _step$value = _slicedToArray(_step.value, 2),\n          i = _step$value[0],\n          val = _step$value[1];\n\n      direction = !direction ? -(arr[i - 1] - arr[i]) : direction;\n      if (i === arr.length - 1) return !direction ? 0 : direction;else if ((val - arr[i + 1]) * direction > 0) return 0;\n    }\n  } catch (err) {\n    _didIteratorError = true;\n    _iteratorError = err;\n  } finally {\n    try {\n      if (!_iteratorNormalCompletion && _iterator.return != null) {\n        _iterator.return();\n      }\n    } finally {\n      if (_didIteratorError) {\n        throw _iteratorError;\n      }\n    }\n  }\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar isSorted = function isSorted(arr) {\n  var direction = -(arr[0] - arr[1]);\n  var _iteratorNormalCompletion = true;\n  var _didIteratorError = false;\n  var _iteratorError = undefined;\n\n  try {\n    for (var _iterator = arr.entries()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n      var _step$value = _slicedToArray(_step.value, 2),\n          i = _step$value[0],\n          val = _step$value[1];\n\n      direction = !direction ? -(arr[i - 1] - arr[i]) : direction;\n      if (i === arr.length - 1) return !direction ? 0 : direction;else if ((val - arr[i + 1]) * direction > 0) return 0;\n    }\n  } catch (err) {\n    _didIteratorError = true;\n    _iteratorError = err;\n  } finally {\n    try {\n      if (!_iteratorNormalCompletion && _iterator.return != null) {\n        _iterator.return();\n      }\n    } finally {\n      if (_didIteratorError) {\n        throw _iteratorError;\n      }\n    }\n  }\n};",
           "example": "isSorted([0, 1, 2, 2]); // 1\r\nisSorted([4, 3, 2]); // -1\r\nisSorted([4, 3, 5]); // 0"
         },
         "tags": [
@@ -3474,7 +3474,7 @@
         "text": "Checks if the given argument is a stream.\r\n\r\nCheck if the value is different from `null`, use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.",
         "codeBlocks": {
           "es6": "const isStream = val => val !== null && typeof val === 'object' && typeof val.pipe === 'function';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isStream = function isStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isStream = function isStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function';\n};",
           "example": "const fs = require('fs');\r\nisStream(fs.createReadStream('test.txt')); // true"
         },
         "tags": [
@@ -3496,7 +3496,7 @@
         "text": "Checks if the given argument is a string. Only works for string primitives.\r\n\r\nUse `typeof` to check if a value is classified as a string primitive.",
         "codeBlocks": {
           "es6": "const isString = val => typeof val === 'string';",
-          "es5": "\"use strict\";\n\nvar isString = function isString(val) {\n  return typeof val === 'string';\n};",
+          "es5": "var isString = function isString(val) {\n  return typeof val === 'string';\n};",
           "example": "isString('10'); // true"
         },
         "tags": [
@@ -3518,7 +3518,7 @@
         "text": "Checks if the given argument is a symbol.\r\n\r\nUse `typeof` to check if a value is classified as a symbol primitive.",
         "codeBlocks": {
           "es6": "const isSymbol = val => typeof val === 'symbol';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isSymbol = function isSymbol(val) {\n  return _typeof(val) === 'symbol';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isSymbol = function isSymbol(val) {\n  return _typeof(val) === 'symbol';\n};",
           "example": "isSymbol(Symbol('x')); // true"
         },
         "tags": [
@@ -3539,7 +3539,7 @@
         "text": "Checks if the current environment is [Travis CI](https://travis-ci.org/).\r\n\r\nChecks if the current environment has the `TRAVIS` and `CI` environment variables ([reference](https://docs.travis-ci.com/user/environment-variables/#Default-Environment-Variables)).",
         "codeBlocks": {
           "es6": "const isTravisCI = () => 'TRAVIS' in process.env && 'CI' in process.env;",
-          "es5": "\"use strict\";\n\nvar isTravisCI = function isTravisCI() {\n  return 'TRAVIS' in process.env && 'CI' in process.env;\n};",
+          "es5": "var isTravisCI = function isTravisCI() {\n  return 'TRAVIS' in process.env && 'CI' in process.env;\n};",
           "example": "isTravisCI(); // true (if code is running on Travis CI)"
         },
         "tags": [
@@ -3560,7 +3560,7 @@
         "text": "Returns `true` if the specified value is `undefined`, `false` otherwise.\r\n\r\nUse the strict equality operator to check if the value and of `val` are equal to `undefined`.",
         "codeBlocks": {
           "es6": "const isUndefined = val => val === undefined;",
-          "es5": "\"use strict\";\n\nvar isUndefined = function isUndefined(val) {\n  return val === undefined;\n};",
+          "es5": "var isUndefined = function isUndefined(val) {\n  return val === undefined;\n};",
           "example": "isUndefined(undefined); // true"
         },
         "tags": [
@@ -3581,7 +3581,7 @@
         "text": "Checks if a string is upper case.\r\n\r\nConvert the given string to upper case, using `String.prototype.toUpperCase()` and compare it to the original.",
         "codeBlocks": {
           "es6": "const isUpperCase = str => str === str.toUpperCase();",
-          "es5": "\"use strict\";\n\nvar isUpperCase = function isUpperCase(str) {\n  return str === str.toUpperCase();\n};",
+          "es5": "var isUpperCase = function isUpperCase(str) {\n  return str === str.toUpperCase();\n};",
           "example": "isUpperCase('ABC'); // true\r\nisLowerCase('A3@$'); // true\r\nisLowerCase('aB4'); // false"
         },
         "tags": [
@@ -3603,7 +3603,7 @@
         "text": "Checks if the provided argument is a valid JSON.\r\n\r\nUse `JSON.parse()` and a `try... catch` block to check if the provided argument is a valid JSON.",
         "codeBlocks": {
           "es6": "const isValidJSON = obj => {\r\n  try {\r\n    JSON.parse(obj);\r\n    return true;\r\n  } catch (e) {\r\n    return false;\r\n  }\r\n};",
-          "es5": "\"use strict\";\n\nvar isValidJSON = function isValidJSON(obj) {\n  try {\n    JSON.parse(obj);\n    return true;\n  } catch (e) {\n    return false;\n  }\n};",
+          "es5": "var isValidJSON = function isValidJSON(obj) {\n  try {\n    JSON.parse(obj);\n    return true;\n  } catch (e) {\n    return false;\n  }\n};",
           "example": "isValidJSON('{\"name\":\"Adam\",\"age\":20}'); // true\r\nisValidJSON('{\"name\":\"Adam\",age:\"20\"}'); // false\r\nisValidJSON(null); // true"
         },
         "tags": [
@@ -3625,7 +3625,7 @@
         "text": "Checks if the given argument is a writable stream.\r\n\r\nCheck if the value is different from `null`, use `typeof` to check if the value is of type `object` and the `pipe` property is of type `function`.\r\nAdditionally check if the `typeof` the `_write` and `_writableState` properties are `function` and `object` respectively.",
         "codeBlocks": {
           "es6": "const isWritableStream = val =>\r\n  val !== null &&\r\n  typeof val === 'object' &&\r\n  typeof val.pipe === 'function' &&\r\n  typeof val._write === 'function' &&\r\n  typeof val._writableState === 'object';",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isWritableStream = function isWritableStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._write === 'function' && _typeof(val._writableState) === 'object';\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar isWritableStream = function isWritableStream(val) {\n  return val !== null && _typeof(val) === 'object' && typeof val.pipe === 'function' && typeof val._write === 'function' && _typeof(val._writableState) === 'object';\n};",
           "example": "const fs = require('fs');\r\nisWritableStream(fs.createWriteStream('test.txt')); // true"
         },
         "tags": [
@@ -3647,7 +3647,7 @@
         "text": "Joins all elements of an array into a string and returns this string.\r\nUses a separator and an end separator.\r\n\r\nUse `Array.prototype.reduce()` to combine elements into a string.\r\nOmit the second argument, `separator`, to use a default separator of `','`.\r\nOmit the third argument, `end`, to use the same value as `separator` by default.",
         "codeBlocks": {
           "es6": "const join = (arr, separator = ',', end = separator) =>\r\n  arr.reduce(\r\n    (acc, val, i) =>\r\n      i === arr.length - 2\r\n        ? acc + val + end\r\n        : i === arr.length - 1\r\n          ? acc + val\r\n          : acc + val + separator,\r\n    ''\r\n  );",
-          "es5": "\"use strict\";\n\nvar join = function join(arr) {\n  var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : separator;\n  return arr.reduce(function (acc, val, i) {\n    return i === arr.length - 2 ? acc + val + end : i === arr.length - 1 ? acc + val : acc + val + separator;\n  }, '');\n};",
+          "es5": "var join = function join(arr) {\n  var separator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : ',';\n  var end = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : separator;\n  return arr.reduce(function (acc, val, i) {\n    return i === arr.length - 2 ? acc + val + end : i === arr.length - 1 ? acc + val : acc + val + separator;\n  }, '');\n};",
           "example": "join(['pen', 'pineapple', 'apple', 'pen'], ',', '&'); // \"pen,pineapple,apple&pen\"\r\njoin(['pen', 'pineapple', 'apple', 'pen'], ','); // \"pen,pineapple,apple,pen\"\r\njoin(['pen', 'pineapple', 'apple', 'pen']); // \"pen,pineapple,apple,pen\""
         },
         "tags": [
@@ -3668,7 +3668,7 @@
         "text": "Converts an array of objects to a comma-separated values (CSV) string that contains only the `columns` specified.\r\n\r\nUse `Array.prototype.join(delimiter)` to combine all the names in `columns` to create the first row.\r\nUse `Array.prototype.map()` and `Array.prototype.reduce()` to create a row for each object, substituting non-existent values with empty strings and only mapping values in `columns`.\r\nUse `Array.prototype.join('\\n')` to combine all rows into a string.\r\nOmit the third argument, `delimiter`, to use a default delimiter of `,`.",
         "codeBlocks": {
           "es6": "const JSONtoCSV = (arr, columns, delimiter = ',') =>\r\n  [\r\n    columns.join(delimiter),\r\n    ...arr.map(obj =>\r\n      columns.reduce(\r\n        (acc, key) => `${acc}${!acc.length ? '' : delimiter}\"${!obj[key] ? '' : obj[key]}\"`,\r\n        ''\r\n      )\r\n    )\r\n  ].join('\\n');",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar JSONtoCSV = function JSONtoCSV(arr, columns) {\n  var delimiter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ',';\n  return [columns.join(delimiter)].concat(_toConsumableArray(arr.map(function (obj) {\n    return columns.reduce(function (acc, key) {\n      return \"\".concat(acc).concat(!acc.length ? '' : delimiter, \"\\\"\").concat(!obj[key] ? '' : obj[key], \"\\\"\");\n    }, '');\n  }))).join('\\n');\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar JSONtoCSV = function JSONtoCSV(arr, columns) {\n  var delimiter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ',';\n  return [columns.join(delimiter)].concat(_toConsumableArray(arr.map(function (obj) {\n    return columns.reduce(function (acc, key) {\n      return \"\".concat(acc).concat(!acc.length ? '' : delimiter, \"\\\"\").concat(!obj[key] ? '' : obj[key], \"\\\"\");\n    }, '');\n  }))).join('\\n');\n};",
           "example": "JSONtoCSV([{ a: 1, b: 2 }, { a: 3, b: 4, c: 5 }, { a: 6 }, { b: 7 }], ['a', 'b']); // 'a,b\\n\"1\",\"2\"\\n\"3\",\"4\"\\n\"6\",\"\"\\n\"\",\"7\"'\r\nJSONtoCSV([{ a: 1, b: 2 }, { a: 3, b: 4, c: 5 }, { a: 6 }, { b: 7 }], ['a', 'b'], ';'); // 'a;b\\n\"1\";\"2\"\\n\"3\";\"4\"\\n\"6\";\"\"\\n\"\";\"7\"'"
         },
         "tags": [
@@ -3691,7 +3691,7 @@
         "text": "Writes a JSON object to a file.\r\n\r\nUse `fs.writeFile()`, template literals and `JSON.stringify()` to write a `json` object to a `.json` file.",
         "codeBlocks": {
           "es6": "const fs = require('fs');\r\nconst JSONToFile = (obj, filename) =>\r\n  fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));",
-          "es5": "\"use strict\";\n\nvar fs = require('fs');\n\nvar JSONToFile = function JSONToFile(obj, filename) {\n  return fs.writeFile(\"\".concat(filename, \".json\"), JSON.stringify(obj, null, 2));\n};",
+          "es5": "var fs = require('fs');\n\nvar JSONToFile = function JSONToFile(obj, filename) {\n  return fs.writeFile(\"\".concat(filename, \".json\"), JSON.stringify(obj, null, 2));\n};",
           "example": "JSONToFile({ test: 'is passed' }, 'testJsonFile'); // writes the object to 'testJsonFile.json'"
         },
         "tags": [
@@ -3713,7 +3713,7 @@
         "text": "Returns the last element in an array.\r\n\r\nUse `arr.length - 1` to compute the index of the last element of the given array and returning it.",
         "codeBlocks": {
           "es6": "const last = arr => arr[arr.length - 1];",
-          "es5": "\"use strict\";\n\nvar last = function last(arr) {\n  return arr[arr.length - 1];\n};",
+          "es5": "var last = function last(arr) {\n  return arr[arr.length - 1];\n};",
           "example": "last([1, 2, 3]); // 3"
         },
         "tags": [
@@ -3734,7 +3734,7 @@
         "text": "Returns the least common multiple of two or more numbers.\r\n\r\nUse the greatest common divisor (GCD) formula and the fact that `lcm(x,y) = x * y / gcd(x,y)` to determine the least common multiple.\r\nThe GCD formula uses recursion.",
         "codeBlocks": {
           "es6": "const lcm = (...arr) => {\r\n  const gcd = (x, y) => (!y ? x : gcd(y, x % y));\r\n  const _lcm = (x, y) => (x * y) / gcd(x, y);\r\n  return [...arr].reduce((a, b) => _lcm(a, b));\r\n};",
-          "es5": "\"use strict\";\n\nvar lcm = function lcm() {\n  var gcd = function gcd(x, y) {\n    return !y ? x : gcd(y, x % y);\n  };\n\n  var _lcm = function _lcm(x, y) {\n    return x * y / gcd(x, y);\n  };\n\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (a, b) {\n    return _lcm(a, b);\n  });\n};",
+          "es5": "var lcm = function lcm() {\n  var gcd = function gcd(x, y) {\n    return !y ? x : gcd(y, x % y);\n  };\n\n  var _lcm = function _lcm(x, y) {\n    return x * y / gcd(x, y);\n  };\n\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (a, b) {\n    return _lcm(a, b);\n  });\n};",
           "example": "lcm(12, 7); // 84\r\nlcm(...[1, 3, 4, 5]); // 60"
         },
         "tags": [
@@ -3756,7 +3756,7 @@
         "text": "Takes any number of iterable objects or objects with a `length` property and returns the longest one.\r\nIf multiple objects have the same length, the first one will be returned.\r\nReturns `undefined` if no arguments are provided.\r\n\r\nUse `Array.prototype.reduce()`, comparing the `length` of objects to find the longest one.",
         "codeBlocks": {
           "es6": "const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));",
-          "es5": "\"use strict\";\n\nvar longestItem = function longestItem() {\n  for (var _len = arguments.length, vals = new Array(_len), _key = 0; _key < _len; _key++) {\n    vals[_key] = arguments[_key];\n  }\n\n  return vals.reduce(function (a, x) {\n    return x.length > a.length ? x : a;\n  });\n};",
+          "es5": "var longestItem = function longestItem() {\n  for (var _len = arguments.length, vals = new Array(_len), _key = 0; _key < _len; _key++) {\n    vals[_key] = arguments[_key];\n  }\n\n  return vals.reduce(function (a, x) {\n    return x.length > a.length ? x : a;\n  });\n};",
           "example": "longestItem('this', 'is', 'a', 'testcase'); // 'testcase'\r\nlongestItem(...['a', 'ab', 'abc']); // 'abc'\r\nlongestItem(...['a', 'ab', 'abc'], 'abcd'); // 'abcd'\r\nlongestItem([1, 2, 3], [1, 2], [1, 2, 3, 4, 5]); // [1, 2, 3, 4, 5]\r\nlongestItem([1, 2, 3], 'foobar'); // 'foobar'"
         },
         "tags": [
@@ -3779,7 +3779,7 @@
         "text": "Creates a new object from the specified object, where all the keys are in lowercase.\r\n\r\nUse `Object.keys()` and `Array.prototype.reduce()` to create a new object from the specified object.\r\nConvert each key in the original object to lowercase, using `String.toLowerCase()`.",
         "codeBlocks": {
           "es6": "const lowercaseKeys = obj =>\r\n  Object.keys(obj).reduce((acc, key) => {\r\n    acc[key.toLowerCase()] = obj[key];\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar lowercaseKeys = function lowercaseKeys(obj) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    acc[key.toLowerCase()] = obj[key];\n    return acc;\n  }, {});\n};",
+          "es5": "var lowercaseKeys = function lowercaseKeys(obj) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    acc[key.toLowerCase()] = obj[key];\n    return acc;\n  }, {});\n};",
           "example": "const myObj = { Name: 'Adam', sUrnAME: 'Smith' };\r\nconst myObjLower = lowercaseKeys(myObj); // {name: 'Adam', surname: 'Smith'};"
         },
         "tags": [
@@ -3800,7 +3800,7 @@
         "text": "Implementation of the [Luhn Algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm) used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers etc.\r\n\r\nUse `String.prototype.split('')`, `Array.prototype.reverse()` and `Array.prototype.map()` in combination with `parseInt()` to obtain an array of digits.\r\nUse `Array.prototype.splice(0,1)` to obtain the last digit.\r\nUse `Array.prototype.reduce()` to implement the Luhn Algorithm.\r\nReturn `true` if `sum` is divisible by `10`, `false` otherwise.",
         "codeBlocks": {
           "es6": "const luhnCheck = num => {\r\n  let arr = (num + '')\r\n    .split('')\r\n    .reverse()\r\n    .map(x => parseInt(x));\r\n  let lastDigit = arr.splice(0, 1)[0];\r\n  let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9), 0);\r\n  sum += lastDigit;\r\n  return sum % 10 === 0;\r\n};",
-          "es5": "\"use strict\";\n\nvar luhnCheck = function luhnCheck(num) {\n  var arr = (num + '').split('').reverse().map(function (x) {\n    return parseInt(x);\n  });\n  var lastDigit = arr.splice(0, 1)[0];\n  var sum = arr.reduce(function (acc, val, i) {\n    return i % 2 !== 0 ? acc + val : acc + val * 2 % 9 || 9;\n  }, 0);\n  sum += lastDigit;\n  return sum % 10 === 0;\n};",
+          "es5": "var luhnCheck = function luhnCheck(num) {\n  var arr = (num + '').split('').reverse().map(function (x) {\n    return parseInt(x);\n  });\n  var lastDigit = arr.splice(0, 1)[0];\n  var sum = arr.reduce(function (acc, val, i) {\n    return i % 2 !== 0 ? acc + val : acc + val * 2 % 9 || 9;\n  }, 0);\n  sum += lastDigit;\n  return sum % 10 === 0;\n};",
           "example": "luhnCheck('4485275742308327'); // true\r\nluhnCheck(6011329933655299); //  false\r\nluhnCheck(123456789); // false"
         },
         "tags": [
@@ -3822,7 +3822,7 @@
         "text": "Creates an object with keys generated by running the provided function for each key and the same values as the provided object.\r\n\r\nUse `Object.keys(obj)` to iterate over the object's keys.\r\nUse `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.",
         "codeBlocks": {
           "es6": "const mapKeys = (obj, fn) =>\r\n  Object.keys(obj).reduce((acc, k) => {\r\n    acc[fn(obj[k], k, obj)] = obj[k];\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar mapKeys = function mapKeys(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    acc[fn(obj[k], k, obj)] = obj[k];\n    return acc;\n  }, {});\n};",
+          "es5": "var mapKeys = function mapKeys(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    acc[fn(obj[k], k, obj)] = obj[k];\n    return acc;\n  }, {});\n};",
           "example": "mapKeys({ a: 1, b: 2 }, (val, key) => key + val); // { a1: 1, b2: 2 }"
         },
         "tags": [
@@ -3844,7 +3844,7 @@
         "text": "Maps the values of an array to an object using a function, where the key-value pairs consist of the original value as the key and the mapped value.\r\n\r\nUse an anonymous inner function scope to declare an undefined memory space, using closures to store a return value. Use a new `Array` to store the array with a map of the function over its data set and a comma operator to return a second step, without needing to move from one context to another (due to closures and order of operations).",
         "codeBlocks": {
           "es6": "const mapObject = (arr, fn) =>\r\n  (a => (\r\n    (a = [arr, arr.map(fn)]), a[0].reduce((acc, val, ind) => ((acc[val] = a[1][ind]), acc), {})\r\n  ))();",
-          "es5": "\"use strict\";\n\nvar mapObject = function mapObject(arr, fn) {\n  return function (a) {\n    return a = [arr, arr.map(fn)], a[0].reduce(function (acc, val, ind) {\n      return acc[val] = a[1][ind], acc;\n    }, {});\n  }();\n};",
+          "es5": "var mapObject = function mapObject(arr, fn) {\n  return function (a) {\n    return a = [arr, arr.map(fn)], a[0].reduce(function (acc, val, ind) {\n      return acc[val] = a[1][ind], acc;\n    }, {});\n  }();\n};",
           "example": "const squareIt = arr => mapObject(arr, a => a * a);\r\nsquareIt([1, 2, 3]); // { 1: 1, 2: 4, 3: 9 }"
         },
         "tags": [
@@ -3866,7 +3866,7 @@
         "text": "Creates a new string with the results of calling a provided function on every character in the calling string.\r\n\r\nUse `String.prototype.split('')` and `Array.prototype.map()` to call the provided function, `fn`, for each character in `str`.\r\nUse `Array.prototype.join('')` to recombine the array of characters into a string.\r\nThe callback function, `fn`, takes three arguments (the current character, the index of the current character and the string `mapString` was called upon).",
         "codeBlocks": {
           "es6": "const mapString = (str, fn) =>\r\n  str\r\n    .split('')\r\n    .map((c, i) => fn(c, i, str))\r\n    .join('');",
-          "es5": "\"use strict\";\n\nvar mapString = function mapString(str, fn) {\n  return str.split('').map(function (c, i) {\n    return fn(c, i, str);\n  }).join('');\n};",
+          "es5": "var mapString = function mapString(str, fn) {\n  return str.split('').map(function (c, i) {\n    return fn(c, i, str);\n  }).join('');\n};",
           "example": "mapString('lorem ipsum', c => c.toUpperCase()); // 'LOREM IPSUM'"
         },
         "tags": [
@@ -3890,7 +3890,7 @@
         "text": "Creates an object with the same keys as the provided object and values generated by running the provided function for each value.\r\n\r\nUse `Object.keys(obj)` to iterate over the object's keys.\r\nUse `Array.prototype.reduce()` to create a new object with the same keys and mapped values using `fn`.",
         "codeBlocks": {
           "es6": "const mapValues = (obj, fn) =>\r\n  Object.keys(obj).reduce((acc, k) => {\r\n    acc[k] = fn(obj[k], k, obj);\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar mapValues = function mapValues(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    acc[k] = fn(obj[k], k, obj);\n    return acc;\n  }, {});\n};",
+          "es5": "var mapValues = function mapValues(obj, fn) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    acc[k] = fn(obj[k], k, obj);\n    return acc;\n  }, {});\n};",
           "example": "const users = {\r\n  fred: { user: 'fred', age: 40 },\r\n  pebbles: { user: 'pebbles', age: 1 }\r\n};\r\nmapValues(users, u => u.age); // { fred: 40, pebbles: 1 }"
         },
         "tags": [
@@ -3912,7 +3912,7 @@
         "text": "Replaces all but the last `num` of characters with the specified mask character.\r\n\r\nUse `String.prototype.slice()` to grab the portion of the characters that will remain unmasked and use `String.padStart()` to fill the beginning of the string with the mask character up to the original length.\r\nOmit the second argument, `num`, to keep a default of `4` characters unmasked. If `num` is negative, the unmasked characters will be at the start of the string.\r\nOmit the third argument, `mask`, to use a default character of `'*'` for the mask.",
         "codeBlocks": {
           "es6": "const mask = (cc, num = 4, mask = '*') => `${cc}`.slice(-num).padStart(`${cc}`.length, mask);",
-          "es5": "\"use strict\";\n\nvar mask = function mask(cc) {\n  var num = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 4;\n  var mask = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '*';\n  return \"\".concat(cc).slice(-num).padStart(\"\".concat(cc).length, mask);\n};",
+          "es5": "var mask = function mask(cc) {\n  var num = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 4;\n  var mask = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '*';\n  return \"\".concat(cc).slice(-num).padStart(\"\".concat(cc).length, mask);\n};",
           "example": "mask(1234567890); // '******7890'\r\nmask(1234567890, 3); // '*******890'\r\nmask(1234567890, -4, '$'); // '$$$$567890'"
         },
         "tags": [
@@ -3935,7 +3935,7 @@
         "text": "Compares two objects to determine if the first one contains equivalent property values to the second one.\r\n\r\nUse `Object.keys(source)` to get all the keys of the second object, then `Array.prototype.every()`, `Object.hasOwnProperty()` and strict comparison to determine if all keys exist in the first object and have the same values.",
         "codeBlocks": {
           "es6": "const matches = (obj, source) =>\r\n  Object.keys(source).every(key => obj.hasOwnProperty(key) && obj[key] === source[key]);",
-          "es5": "\"use strict\";\n\nvar matches = function matches(obj, source) {\n  return Object.keys(source).every(function (key) {\n    return obj.hasOwnProperty(key) && obj[key] === source[key];\n  });\n};",
+          "es5": "var matches = function matches(obj, source) {\n  return Object.keys(source).every(function (key) {\n    return obj.hasOwnProperty(key) && obj[key] === source[key];\n  });\n};",
           "example": "matches({ age: 25, hair: 'long', beard: true }, { hair: 'long', beard: true }); // true\r\nmatches({ hair: 'long', beard: true }, { age: 25, hair: 'long', beard: true }); // false"
         },
         "tags": [
@@ -3957,7 +3957,7 @@
         "text": "Compares two objects to determine if the first one contains equivalent property values to the second one, based on a provided function.\r\n\r\nUse `Object.keys(source)` to get all the keys of the second object, then `Array.prototype.every()`, `Object.hasOwnProperty()` and the provided function to determine if all keys exist in the first object and have equivalent values.\r\nIf no function is provided, the values will be compared using the equality operator.",
         "codeBlocks": {
           "es6": "const matchesWith = (obj, source, fn) =>\r\n  Object.keys(source).every(\r\n    key =>\r\n      obj.hasOwnProperty(key) && fn\r\n        ? fn(obj[key], source[key], key, obj, source)\r\n        : obj[key] == source[key]\r\n  );",
-          "es5": "\"use strict\";\n\nvar matchesWith = function matchesWith(obj, source, fn) {\n  return Object.keys(source).every(function (key) {\n    return obj.hasOwnProperty(key) && fn ? fn(obj[key], source[key], key, obj, source) : obj[key] == source[key];\n  });\n};",
+          "es5": "var matchesWith = function matchesWith(obj, source, fn) {\n  return Object.keys(source).every(function (key) {\n    return obj.hasOwnProperty(key) && fn ? fn(obj[key], source[key], key, obj, source) : obj[key] == source[key];\n  });\n};",
           "example": "const isGreeting = val => /^h(?:i|ello)$/.test(val);\r\nmatchesWith(\r\n  { greeting: 'hello' },\r\n  { greeting: 'hi' },\r\n  (oV, sV) => isGreeting(oV) && isGreeting(sV)\r\n); // true"
         },
         "tags": [
@@ -3980,7 +3980,7 @@
         "text": "Returns the maximum value of an array, after mapping each element to a value using the provided function.\r\n\r\nUse `Array.prototype.map()` to map each element to the value returned by `fn`, `Math.max()` to get the maximum value.",
         "codeBlocks": {
           "es6": "const maxBy = (arr, fn) => Math.max(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar maxBy = function maxBy(arr, fn) {\n  return Math.max.apply(Math, _toConsumableArray(arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar maxBy = function maxBy(arr, fn) {\n  return Math.max.apply(Math, _toConsumableArray(arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  })));\n};",
           "example": "maxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 8\r\nmaxBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 8"
         },
         "tags": [
@@ -4003,7 +4003,7 @@
         "text": "Returns the maximum of the given dates.\r\n\r\nUse `Math.max.apply()` to find the maximum date value, `new Date()` to convert it to a `Date` object.",
         "codeBlocks": {
           "es6": "const maxDate = (...dates) => new Date(Math.max.apply(null, ...dates));",
-          "es5": "\"use strict\";\n\nvar maxDate = function maxDate() {\n  var _Math$max;\n\n  for (var _len = arguments.length, dates = new Array(_len), _key = 0; _key < _len; _key++) {\n    dates[_key] = arguments[_key];\n  }\n\n  return new Date((_Math$max = Math.max).apply.apply(_Math$max, [null].concat(dates)));\n};",
+          "es5": "var maxDate = function maxDate() {\n  var _Math$max;\n\n  for (var _len = arguments.length, dates = new Array(_len), _key = 0; _key < _len; _key++) {\n    dates[_key] = arguments[_key];\n  }\n\n  return new Date((_Math$max = Math.max).apply.apply(_Math$max, [null].concat(dates)));\n};",
           "example": "const array = [\r\n  new Date(2017, 4, 13),\r\n  new Date(2018, 2, 12),\r\n  new Date(2016, 0, 10),\r\n  new Date(2016, 0, 9)\r\n];\r\nmaxDate(array); // 2018-03-11T22:00:00.000Z"
         },
         "tags": [
@@ -4025,7 +4025,7 @@
         "text": "Returns the `n` maximum elements from the provided array.\r\nIf `n` is greater than or equal to the provided array's length, then return the original array (sorted in descending order).\r\n\r\nUse `Array.prototype.sort()` combined with the spread operator (`...`) to create a shallow clone of the array and sort it in descending order.\r\nUse `Array.prototype.slice()` to get the specified number of elements.\r\nOmit the second argument, `n`, to get a one-element array.",
         "codeBlocks": {
           "es6": "const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar maxN = function maxN(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return b - a;\n  }).slice(0, n);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar maxN = function maxN(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return b - a;\n  }).slice(0, n);\n};",
           "example": "maxN([1, 2, 3]); // [3]\r\nmaxN([1, 2, 3], 2); // [3,2]"
         },
         "tags": [
@@ -4047,7 +4047,7 @@
         "text": "Returns the median of an array of numbers.\r\n\r\nFind the middle of the array, use `Array.prototype.sort()` to sort the values.\r\nReturn the number at the midpoint if `length` is odd, otherwise the average of the two middle numbers.",
         "codeBlocks": {
           "es6": "const median = arr => {\r\n  const mid = Math.floor(arr.length / 2),\r\n    nums = [...arr].sort((a, b) => a - b);\r\n  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar median = function median(arr) {\n  var mid = Math.floor(arr.length / 2),\n      nums = _toConsumableArray(arr).sort(function (a, b) {\n    return a - b;\n  });\n\n  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar median = function median(arr) {\n  var mid = Math.floor(arr.length / 2),\n      nums = _toConsumableArray(arr).sort(function (a, b) {\n    return a - b;\n  });\n\n  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;\n};",
           "example": "median([5, 6, 50, 1, -5]); // 5"
         },
         "tags": [
@@ -4069,7 +4069,7 @@
         "text": "Returns the memoized (cached) function.\r\n\r\nCreate an empty cache by instantiating a new `Map` object.\r\nReturn a function which takes a single argument to be supplied to the memoized function by first checking if the function's output for that specific input value is already cached, or store and return it if not. The `function` keyword must be used in order to allow the memoized function to have its `this` context changed if necessary.\r\nAllow access to the `cache` by setting it as a property on the returned function.",
         "codeBlocks": {
           "es6": "const memoize = fn => {\r\n  const cache = new Map();\r\n  const cached = function(val) {\r\n    return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val);\r\n  };\r\n  cached.cache = cache;\r\n  return cached;\r\n};",
-          "es5": "\"use strict\";\n\nvar memoize = function memoize(fn) {\n  var cache = new Map();\n\n  var cached = function cached(val) {\n    return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val);\n  };\n\n  cached.cache = cache;\n  return cached;\n};",
+          "es5": "var memoize = function memoize(fn) {\n  var cache = new Map();\n\n  var cached = function cached(val) {\n    return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val);\n  };\n\n  cached.cache = cache;\n  return cached;\n};",
           "example": "// See the `anagrams` snippet.\r\nconst anagramsCached = memoize(anagrams);\r\nanagramsCached('javascript'); // takes a long time\r\nanagramsCached('javascript'); // returns virtually instantly since it's now cached\r\nconsole.log(anagramsCached.cache); // The cached anagrams map"
         },
         "tags": [
@@ -4090,7 +4090,7 @@
         "text": "Creates a new object from the combination of two or more objects.\r\n\r\nUse `Array.prototype.reduce()` combined with `Object.keys(obj)` to iterate over all objects and keys.\r\nUse `hasOwnProperty()` and `Array.prototype.concat()` to append values for keys existing in multiple objects.",
         "codeBlocks": {
           "es6": "const merge = (...objs) =>\r\n  [...objs].reduce(\r\n    (acc, obj) =>\r\n      Object.keys(obj).reduce((a, k) => {\r\n        acc[k] = acc.hasOwnProperty(k) ? [].concat(acc[k]).concat(obj[k]) : obj[k];\r\n        return acc;\r\n      }, {}),\r\n    {}\r\n  );",
-          "es5": "\"use strict\";\n\nvar merge = function merge() {\n  for (var _len = arguments.length, objs = new Array(_len), _key = 0; _key < _len; _key++) {\n    objs[_key] = arguments[_key];\n  }\n\n  return objs.concat().reduce(function (acc, obj) {\n    return Object.keys(obj).reduce(function (a, k) {\n      acc[k] = acc.hasOwnProperty(k) ? [].concat(acc[k]).concat(obj[k]) : obj[k];\n      return acc;\n    }, {});\n  }, {});\n};",
+          "es5": "var merge = function merge() {\n  for (var _len = arguments.length, objs = new Array(_len), _key = 0; _key < _len; _key++) {\n    objs[_key] = arguments[_key];\n  }\n\n  return objs.concat().reduce(function (acc, obj) {\n    return Object.keys(obj).reduce(function (a, k) {\n      acc[k] = acc.hasOwnProperty(k) ? [].concat(acc[k]).concat(obj[k]) : obj[k];\n      return acc;\n    }, {});\n  }, {});\n};",
           "example": "const object = {\r\n  a: [{ x: 2 }, { y: 4 }],\r\n  b: 1\r\n};\r\nconst other = {\r\n  a: { z: 3 },\r\n  b: [2, 3],\r\n  c: 'foo'\r\n};\r\nmerge(object, other); // { a: [ { x: 2 }, { y: 4 }, { z: 3 } ], b: [ 1, 2, 3 ], c: 'foo' }"
         },
         "tags": [
@@ -4112,7 +4112,7 @@
         "text": "Returns the minimum value of an array, after mapping each element to a value using the provided function.\r\n\r\nUse `Array.prototype.map()` to map each element to the value returned by `fn`, `Math.min()` to get the maximum value.",
         "codeBlocks": {
           "es6": "const minBy = (arr, fn) => Math.min(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar minBy = function minBy(arr, fn) {\n  return Math.min.apply(Math, _toConsumableArray(arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar minBy = function minBy(arr, fn) {\n  return Math.min.apply(Math, _toConsumableArray(arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  })));\n};",
           "example": "minBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 2\r\nminBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 2"
         },
         "tags": [
@@ -4135,7 +4135,7 @@
         "text": "Returns the minimum of the given dates.\r\n\r\nUse `Math.min.apply()` to find the minimum date value, `new Date()` to convert it to a `Date` object.",
         "codeBlocks": {
           "es6": "const minDate = (...dates) => new Date(Math.min.apply(null, ...dates));",
-          "es5": "\"use strict\";\n\nvar minDate = function minDate() {\n  var _Math$min;\n\n  for (var _len = arguments.length, dates = new Array(_len), _key = 0; _key < _len; _key++) {\n    dates[_key] = arguments[_key];\n  }\n\n  return new Date((_Math$min = Math.min).apply.apply(_Math$min, [null].concat(dates)));\n};",
+          "es5": "var minDate = function minDate() {\n  var _Math$min;\n\n  for (var _len = arguments.length, dates = new Array(_len), _key = 0; _key < _len; _key++) {\n    dates[_key] = arguments[_key];\n  }\n\n  return new Date((_Math$min = Math.min).apply.apply(_Math$min, [null].concat(dates)));\n};",
           "example": "const array = [\r\n  new Date(2017, 4, 13),\r\n  new Date(2018, 2, 12),\r\n  new Date(2016, 0, 10),\r\n  new Date(2016, 0, 9)\r\n];\r\nminDate(array); // 2016-01-08T22:00:00.000Z"
         },
         "tags": [
@@ -4157,7 +4157,7 @@
         "text": "Returns the `n` minimum elements from the provided array.\r\nIf `n` is greater than or equal to the provided array's length, then return the original array (sorted in ascending order).\r\n\r\nUse `Array.prototype.sort()` combined with the spread operator (`...`) to create a shallow clone of the array and sort it in ascending order.\r\nUse `Array.prototype.slice()` to get the specified number of elements.\r\nOmit the second argument, `n`, to get a one-element array.",
         "codeBlocks": {
           "es6": "const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar minN = function minN(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return a - b;\n  }).slice(0, n);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar minN = function minN(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return a - b;\n  }).slice(0, n);\n};",
           "example": "minN([1, 2, 3]); // [1]\r\nminN([1, 2, 3], 2); // [1,2]"
         },
         "tags": [
@@ -4179,7 +4179,7 @@
         "text": "Returns the index of the function in an array of functions which executed the fastest.\r\n\r\nUse `Array.prototype.map()` to generate an array where each value is the total time taken to execute the function after `iterations` times. Use the difference in `performance.now()` values before and after to get the total time in milliseconds to a high degree of accuracy.\r\nUse `Math.min()` to find the minimum execution time, and return the index of that shortest time which corresponds to the index of the most performant function.\r\nOmit the second argument, `iterations`, to use a default of 10,000 iterations. The more iterations, the more reliable the result but the longer it will take.",
         "codeBlocks": {
           "es6": "const mostPerformant = (fns, iterations = 10000) => {\r\n  const times = fns.map(fn => {\r\n    const before = performance.now();\r\n    for (let i = 0; i < iterations; i++) fn();\r\n    return performance.now() - before;\r\n  });\r\n  return times.indexOf(Math.min(...times));\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar mostPerformant = function mostPerformant(fns) {\n  var iterations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 10000;\n  var times = fns.map(function (fn) {\n    var before = performance.now();\n\n    for (var i = 0; i < iterations; i++) {\n      fn();\n    }\n\n    return performance.now() - before;\n  });\n  return times.indexOf(Math.min.apply(Math, _toConsumableArray(times)));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar mostPerformant = function mostPerformant(fns) {\n  var iterations = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 10000;\n  var times = fns.map(function (fn) {\n    var before = performance.now();\n\n    for (var i = 0; i < iterations; i++) {\n      fn();\n    }\n\n    return performance.now() - before;\n  });\n  return times.indexOf(Math.min.apply(Math, _toConsumableArray(times)));\n};",
           "example": "mostPerformant([\r\n  () => {\r\n    // Loops through the entire array before returning `false`\r\n    [1, 2, 3, 4, 5, 6, 7, 8, 9, '10'].every(el => typeof el === 'number');\r\n  },\r\n  () => {\r\n    // Only needs to reach index `1` before returning false\r\n    [1, '2', 3, 4, 5, 6, 7, 8, 9, 10].every(el => typeof el === 'number');\r\n  }\r\n]); // 1"
         },
         "tags": [
@@ -4200,7 +4200,7 @@
         "text": "Negates a predicate function.\r\n\r\nTake a predicate function and apply the not operator (`!`) to it with its arguments.",
         "codeBlocks": {
           "es6": "const negate = func => (...args) => !func(...args);",
-          "es5": "\"use strict\";\n\nvar negate = function negate(func) {\n  return function () {\n    return !func.apply(void 0, arguments);\n  };\n};",
+          "es5": "var negate = function negate(func) {\n  return function () {\n    return !func.apply(void 0, arguments);\n  };\n};",
           "example": "[1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 === 0)); // [ 1, 3, 5 ]"
         },
         "tags": [
@@ -4221,7 +4221,7 @@
         "text": "Given a flat array of objects linked to one another, it will nest them recursively.\r\nUseful for nesting comments, such as the ones on reddit.com.\r\n\r\nUse recursion.\r\nUse `Array.prototype.filter()` to filter the items where the `id` matches the `link`, then `Array.prototype.map()` to map each one to a new object that has a `children` property which recursively nests the items based on which ones are children of the current item.\r\nOmit the second argument, `id`, to default to `null` which indicates the object is not linked to another one (i.e. it is a top level object).\r\nOmit the third argument, `link`, to use `'parent_id'` as the default property which links the object to another one by its `id`.",
         "codeBlocks": {
           "es6": "const nest = (items, id = null, link = 'parent_id') =>\r\n  items\r\n    .filter(item => item[link] === id)\r\n    .map(item => ({ ...item, children: nest(items, item.id) }));",
-          "es5": "\"use strict\";\n\nfunction _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar nest = function nest(items) {\n  var id = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;\n  var link = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'parent_id';\n  return items.filter(function (item) {\n    return item[link] === id;\n  }).map(function (item) {\n    return _objectSpread({}, item, {\n      children: nest(items, item.id)\n    });\n  });\n};",
+          "es5": "function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar nest = function nest(items) {\n  var id = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;\n  var link = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 'parent_id';\n  return items.filter(function (item) {\n    return item[link] === id;\n  }).map(function (item) {\n    return _objectSpread({}, item, {\n      children: nest(items, item.id)\n    });\n  });\n};",
           "example": "// One top level comment\r\nconst comments = [\r\n  { id: 1, parent_id: null },\r\n  { id: 2, parent_id: 1 },\r\n  { id: 3, parent_id: 1 },\r\n  { id: 4, parent_id: 2 },\r\n  { id: 5, parent_id: 4 }\r\n];\r\nconst nestedComments = nest(comments); // [{ id: 1, parent_id: null, children: [...] }]"
         },
         "tags": [
@@ -4242,7 +4242,7 @@
         "text": "Converts a `NodeList` to an array.\r\n\r\nUse spread operator inside new array to convert a `NodeList` to an array.",
         "codeBlocks": {
           "es6": "const nodeListToArray = nodeList => [...nodeList];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar nodeListToArray = function nodeListToArray(nodeList) {\n  return _toConsumableArray(nodeList);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar nodeListToArray = function nodeListToArray(nodeList) {\n  return _toConsumableArray(nodeList);\n};",
           "example": "nodeListToArray(document.childNodes); // [ <!DOCTYPE html>, html ]"
         },
         "tags": [
@@ -4264,7 +4264,7 @@
         "text": "Returns `true` if the provided predicate function returns `false` for all elements in a collection, `false` otherwise.\r\n\r\nUse `Array.prototype.some()` to test if any elements in the collection return `true` based on `fn`.\r\nOmit the second argument, `fn`, to use `Boolean` as a default.",
         "codeBlocks": {
           "es6": "const none = (arr, fn = Boolean) => !arr.some(fn);",
-          "es5": "\"use strict\";\n\nvar none = function none(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return !arr.some(fn);\n};",
+          "es5": "var none = function none(arr) {\n  var fn = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Boolean;\n  return !arr.some(fn);\n};",
           "example": "none([0, 1, 3, 0], x => x == 2); // true\r\nnone([0, 0, 0]); // true"
         },
         "tags": [
@@ -4286,7 +4286,7 @@
         "text": "Creates a function that gets the argument at index `n`. If `n` is negative, the nth argument from the end is returned.\r\n\r\nUse `Array.prototype.slice()` to get the desired argument at index `n`.",
         "codeBlocks": {
           "es6": "const nthArg = n => (...args) => args.slice(n)[0];",
-          "es5": "\"use strict\";\n\nvar nthArg = function nthArg(n) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return args.slice(n)[0];\n  };\n};",
+          "es5": "var nthArg = function nthArg(n) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return args.slice(n)[0];\n  };\n};",
           "example": "const third = nthArg(2);\r\nthird(1, 2, 3); // 3\r\nthird(1, 2); // undefined\r\nconst last = nthArg(-1);\r\nlast(1, 2, 3, 4, 5); // 5"
         },
         "tags": [
@@ -4308,7 +4308,7 @@
         "text": "Returns the nth element of an array.\r\n\r\nUse `Array.prototype.slice()` to get an array containing the nth element at the first place.\r\nIf the index is out of bounds, return `undefined`.\r\nOmit the second argument, `n`, to get the first element of the array.",
         "codeBlocks": {
           "es6": "const nthElement = (arr, n = 0) => (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];",
-          "es5": "\"use strict\";\n\nvar nthElement = function nthElement(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];\n};",
+          "es5": "var nthElement = function nthElement(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];\n};",
           "example": "nthElement(['a', 'b', 'c'], 1); // 'b'\r\nnthElement(['a', 'b', 'b'], -3); // 'a'"
         },
         "tags": [
@@ -4329,7 +4329,7 @@
         "text": "Creates an object from the given key-value pairs.\r\n\r\nUse `Array.prototype.reduce()` to create and combine key-value pairs.",
         "codeBlocks": {
           "es6": "const objectFromPairs = arr => arr.reduce((a, [key, val]) => ((a[key] = val), a), {});",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar objectFromPairs = function objectFromPairs(arr) {\n  return arr.reduce(function (a, _ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        key = _ref2[0],\n        val = _ref2[1];\n\n    return a[key] = val, a;\n  }, {});\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar objectFromPairs = function objectFromPairs(arr) {\n  return arr.reduce(function (a, _ref) {\n    var _ref2 = _slicedToArray(_ref, 2),\n        key = _ref2[0],\n        val = _ref2[1];\n\n    return a[key] = val, a;\n  }, {});\n};",
           "example": "objectFromPairs([['a', 1], ['b', 2]]); // {a: 1, b: 2}"
         },
         "tags": [
@@ -4351,7 +4351,7 @@
         "text": "Creates an array of key-value pair arrays from an object.\r\n\r\nUse `Object.keys()` and `Array.prototype.map()` to iterate over the object's keys and produce an array with key-value pairs.",
         "codeBlocks": {
           "es6": "const objectToPairs = obj => Object.keys(obj).map(k => [k, obj[k]]);",
-          "es5": "\"use strict\";\n\nvar objectToPairs = function objectToPairs(obj) {\n  return Object.keys(obj).map(function (k) {\n    return [k, obj[k]];\n  });\n};",
+          "es5": "var objectToPairs = function objectToPairs(obj) {\n  return Object.keys(obj).map(function (k) {\n    return [k, obj[k]];\n  });\n};",
           "example": "objectToPairs({ a: 1, b: 2 }); // [ ['a', 1], ['b', 2] ]"
         },
         "tags": [
@@ -4373,7 +4373,7 @@
         "text": "Returns a new MutationObserver and runs the provided callback for each mutation on the specified element.\r\n\r\nUse a [`MutationObserver`](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) to observe mutations on the given element.\r\nUse `Array.prototype.forEach()` to run the callback for each mutation that is observed.\r\nOmit the third argument, `options`, to use the default [options](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver#MutationObserverInit) (all `true`).",
         "codeBlocks": {
           "es6": "const observeMutations = (element, callback, options) => {\r\n  const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));\r\n  observer.observe(\r\n    element,\r\n    Object.assign(\r\n      {\r\n        childList: true,\r\n        attributes: true,\r\n        attributeOldValue: true,\r\n        characterData: true,\r\n        characterDataOldValue: true,\r\n        subtree: true\r\n      },\r\n      options\r\n    )\r\n  );\r\n  return observer;\r\n};",
-          "es5": "\"use strict\";\n\nvar observeMutations = function observeMutations(element, callback, options) {\n  var observer = new MutationObserver(function (mutations) {\n    return mutations.forEach(function (m) {\n      return callback(m);\n    });\n  });\n  observer.observe(element, Object.assign({\n    childList: true,\n    attributes: true,\n    attributeOldValue: true,\n    characterData: true,\n    characterDataOldValue: true,\n    subtree: true\n  }, options));\n  return observer;\n};",
+          "es5": "var observeMutations = function observeMutations(element, callback, options) {\n  var observer = new MutationObserver(function (mutations) {\n    return mutations.forEach(function (m) {\n      return callback(m);\n    });\n  });\n  observer.observe(element, Object.assign({\n    childList: true,\n    attributes: true,\n    attributeOldValue: true,\n    characterData: true,\n    characterDataOldValue: true,\n    subtree: true\n  }, options));\n  return observer;\n};",
           "example": "const obs = observeMutations(document, console.log); // Logs all mutations that happen on the page\r\nobs.disconnect(); // Disconnects the observer and stops logging mutations on the page"
         },
         "tags": [
@@ -4395,7 +4395,7 @@
         "text": "Removes an event listener from an element.\r\n\r\nUse `EventTarget.removeEventListener()` to remove an event listener from an element. \r\nOmit the fourth argument `opts` to use `false` or specify it based on the options used when the event listener was added.",
         "codeBlocks": {
           "es6": "const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);",
-          "es5": "\"use strict\";\n\nvar off = function off(el, evt, fn) {\n  var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;\n  return el.removeEventListener(evt, fn, opts);\n};",
+          "es5": "var off = function off(el, evt, fn) {\n  var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;\n  return el.removeEventListener(evt, fn, opts);\n};",
           "example": "const fn = () => console.log('!');\r\ndocument.body.addEventListener('click', fn);\r\noff(document.body, 'click', fn); // no longer logs '!' upon clicking on the page"
         },
         "tags": [
@@ -4417,7 +4417,7 @@
         "text": "Moves the specified amount of elements to the end of the array.\r\n\r\nUse `Array.prototype.slice()` twice to get the elements after the specified index and the elements before that.\r\nUse the spread operator(`...`) to combine the two into one array.\r\nIf `offset` is negative, the elements will be moved from end to start.",
         "codeBlocks": {
           "es6": "const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar offset = function offset(arr, _offset) {\n  return _toConsumableArray(arr.slice(_offset)).concat(_toConsumableArray(arr.slice(0, _offset)));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar offset = function offset(arr, _offset) {\n  return _toConsumableArray(arr.slice(_offset)).concat(_toConsumableArray(arr.slice(0, _offset)));\n};",
           "example": "offset([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]\r\noffset([1, 2, 3, 4, 5], -2); // [4, 5, 1, 2, 3]"
         },
         "tags": [
@@ -4438,7 +4438,7 @@
         "text": "Omits the key-value pairs corresponding to the given keys from an object.\r\n\r\nUse `Object.keys(obj)`, `Array.prototype.filter()` and `Array.prototype.includes()` to remove the provided keys.\r\nUse `Array.prototype.reduce()` to convert the filtered keys back to an object with the corresponding key-value pairs.",
         "codeBlocks": {
           "es6": "const omit = (obj, arr) =>\r\n  Object.keys(obj)\r\n    .filter(k => !arr.includes(k))\r\n    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});",
-          "es5": "\"use strict\";\n\nvar omit = function omit(obj, arr) {\n  return Object.keys(obj).filter(function (k) {\n    return !arr.includes(k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
+          "es5": "var omit = function omit(obj, arr) {\n  return Object.keys(obj).filter(function (k) {\n    return !arr.includes(k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
           "example": "omit({ a: 1, b: '2', c: 3 }, ['b']); // { 'a': 1, 'c': 3 }"
         },
         "tags": [
@@ -4460,7 +4460,7 @@
         "text": "Creates an object composed of the properties the given function returns falsey for. The function is invoked with two arguments: (value, key).\r\n\r\nUse `Object.keys(obj)` and `Array.prototype.filter()`to remove the keys for which `fn` returns a truthy value.\r\nUse `Array.prototype.reduce()` to convert the filtered keys back to an object with the corresponding key-value pairs.",
         "codeBlocks": {
           "es6": "const omitBy = (obj, fn) =>\r\n  Object.keys(obj)\r\n    .filter(k => !fn(obj[k], k))\r\n    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});",
-          "es5": "\"use strict\";\n\nvar omitBy = function omitBy(obj, fn) {\n  return Object.keys(obj).filter(function (k) {\n    return !fn(obj[k], k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
+          "es5": "var omitBy = function omitBy(obj, fn) {\n  return Object.keys(obj).filter(function (k) {\n    return !fn(obj[k], k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
           "example": "omitBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { b: '2' }"
         },
         "tags": [
@@ -4483,7 +4483,7 @@
         "text": "Adds an event listener to an element with the ability to use event delegation.\r\n\r\nUse `EventTarget.addEventListener()` to add an event listener to an element. If there is a `target` property supplied to the options object, ensure the event target matches the target specified and then invoke the callback by supplying the correct `this` context.\r\nReturns a reference to the custom delegator function, in order to be possible to use with [`off`](#off).\r\nOmit `opts` to default to non-delegation behavior and event bubbling.",
         "codeBlocks": {
           "es6": "const on = (el, evt, fn, opts = {}) => {\r\n  const delegatorFn = e => e.target.matches(opts.target) && fn.call(e.target, e);\r\n  el.addEventListener(evt, opts.target ? delegatorFn : fn, opts.options || false);\r\n  if (opts.target) return delegatorFn;\r\n};",
-          "es5": "\"use strict\";\n\nvar on = function on(el, evt, fn) {\n  var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};\n\n  var delegatorFn = function delegatorFn(e) {\n    return e.target.matches(opts.target) && fn.call(e.target, e);\n  };\n\n  el.addEventListener(evt, opts.target ? delegatorFn : fn, opts.options || false);\n  if (opts.target) return delegatorFn;\n};",
+          "es5": "var on = function on(el, evt, fn) {\n  var opts = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};\n\n  var delegatorFn = function delegatorFn(e) {\n    return e.target.matches(opts.target) && fn.call(e.target, e);\n  };\n\n  el.addEventListener(evt, opts.target ? delegatorFn : fn, opts.options || false);\n  if (opts.target) return delegatorFn;\n};",
           "example": "const fn = () => console.log('!');\r\non(document.body, 'click', fn); // logs '!' upon clicking the body\r\non(document.body, 'click', fn, { target: 'p' }); // logs '!' upon clicking a `p` element child of the body\r\non(document.body, 'click', fn, { options: true }); // use capturing instead of bubbling"
         },
         "tags": [
@@ -4505,7 +4505,7 @@
         "text": "Ensures a function is called only once.\r\n\r\nUtilizing a closure, use a flag, `called`, and set it to `true` once the function is called for the first time, preventing it from being called again. In order to allow the function to have its `this` context changed (such as in an event listener), the `function` keyword must be used, and the supplied function must have the context applied.\r\nAllow the function to be supplied with an arbitrary number of arguments using the rest/spread (`...`) operator.",
         "codeBlocks": {
           "es6": "const once = fn => {\r\n  let called = false;\r\n  return function(...args) {\r\n    if (called) return;\r\n    called = true;\r\n    return fn.apply(this, args);\r\n  };\r\n};",
-          "es5": "\"use strict\";\n\nvar once = function once(fn) {\n  var called = false;\n  return function () {\n    if (called) return;\n    called = true;\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(this, args);\n  };\n};",
+          "es5": "var once = function once(fn) {\n  var called = false;\n  return function () {\n    if (called) return;\n    called = true;\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(this, args);\n  };\n};",
           "example": "const startApp = function(event) {\r\n  console.log(this, event); // document.body, MouseEvent\r\n};\r\ndocument.body.addEventListener('click', once(startApp)); // only runs `startApp` once upon click"
         },
         "tags": [
@@ -4526,7 +4526,7 @@
         "text": "Run the callback whenever the user input type changes (`mouse` or `touch`). Useful for enabling/disabling code depending on the input device. This process is dynamic and works with hybrid devices (e.g. touchscreen laptops).\r\n\r\nUse two event listeners. Assume `mouse` input initially and bind a `touchstart` event listener to the document. \r\nOn `touchstart`, add a `mousemove` event listener to listen for two consecutive `mousemove` events firing within 20ms, using `performance.now()`.\r\nRun the callback with the input type as an argument in either of these situations.",
         "codeBlocks": {
           "es6": "const onUserInputChange = callback => {\r\n  let type = 'mouse',\r\n    lastTime = 0;\r\n  const mousemoveHandler = () => {\r\n    const now = performance.now();\r\n    if (now - lastTime < 20)\r\n      (type = 'mouse'), callback(type), document.removeEventListener('mousemove', mousemoveHandler);\r\n    lastTime = now;\r\n  };\r\n  document.addEventListener('touchstart', () => {\r\n    if (type === 'touch') return;\r\n    (type = 'touch'), callback(type), document.addEventListener('mousemove', mousemoveHandler);\r\n  });\r\n};",
-          "es5": "\"use strict\";\n\nvar onUserInputChange = function onUserInputChange(callback) {\n  var type = 'mouse',\n      lastTime = 0;\n\n  var mousemoveHandler = function mousemoveHandler() {\n    var now = performance.now();\n    if (now - lastTime < 20) type = 'mouse', callback(type), document.removeEventListener('mousemove', mousemoveHandler);\n    lastTime = now;\n  };\n\n  document.addEventListener('touchstart', function () {\n    if (type === 'touch') return;\n    type = 'touch', callback(type), document.addEventListener('mousemove', mousemoveHandler);\n  });\n};",
+          "es5": "var onUserInputChange = function onUserInputChange(callback) {\n  var type = 'mouse',\n      lastTime = 0;\n\n  var mousemoveHandler = function mousemoveHandler() {\n    var now = performance.now();\n    if (now - lastTime < 20) type = 'mouse', callback(type), document.removeEventListener('mousemove', mousemoveHandler);\n    lastTime = now;\n  };\n\n  document.addEventListener('touchstart', function () {\n    if (type === 'touch') return;\n    type = 'touch', callback(type), document.addEventListener('mousemove', mousemoveHandler);\n  });\n};",
           "example": "onUserInputChange(type => {\r\n  console.log('The user is now using', type, 'as an input method.');\r\n});"
         },
         "tags": [
@@ -4548,7 +4548,7 @@
         "text": "Returns a sorted array of objects ordered by properties and orders.\r\n\r\nUses `Array.prototype.sort()`, `Array.prototype.reduce()` on the `props` array with a default value of `0`, use array destructuring to swap the properties position depending on the order passed.\r\nIf no `orders` array is passed it sort by `'asc'` by default.",
         "codeBlocks": {
           "es6": "const orderBy = (arr, props, orders) =>\r\n  [...arr].sort((a, b) =>\r\n    props.reduce((acc, prop, i) => {\r\n      if (acc === 0) {\r\n        const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];\r\n        acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;\r\n      }\r\n      return acc;\r\n    }, 0)\r\n  );",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar orderBy = function orderBy(arr, props, orders) {\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return props.reduce(function (acc, prop, i) {\n      if (acc === 0) {\n        var _ref = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]],\n            _ref2 = _slicedToArray(_ref, 2),\n            p1 = _ref2[0],\n            p2 = _ref2[1];\n\n        acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;\n      }\n\n      return acc;\n    }, 0);\n  });\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar orderBy = function orderBy(arr, props, orders) {\n  return _toConsumableArray(arr).sort(function (a, b) {\n    return props.reduce(function (acc, prop, i) {\n      if (acc === 0) {\n        var _ref = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]],\n            _ref2 = _slicedToArray(_ref, 2),\n            p1 = _ref2[0],\n            p2 = _ref2[1];\n\n        acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;\n      }\n\n      return acc;\n    }, 0);\n  });\n};",
           "example": "const users = [{ name: 'fred', age: 48 }, { name: 'barney', age: 36 }, { name: 'fred', age: 40 }];\r\norderBy(users, ['name', 'age'], ['asc', 'desc']); // [{name: 'barney', age: 36}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]\r\norderBy(users, ['name', 'age']); // [{name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]"
         },
         "tags": [
@@ -4570,7 +4570,7 @@
         "text": "Creates a function that invokes each provided function with the arguments it receives and returns the results.\r\n\r\nUse `Array.prototype.map()` and `Function.prototype.apply()` to apply each function to the given arguments.",
         "codeBlocks": {
           "es6": "const over = (...fns) => (...args) => fns.map(fn => fn.apply(null, args));",
-          "es5": "\"use strict\";\n\nvar over = function over() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fns.map(function (fn) {\n      return fn.apply(null, args);\n    });\n  };\n};",
+          "es5": "var over = function over() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fns.map(function (fn) {\n      return fn.apply(null, args);\n    });\n  };\n};",
           "example": "const minMax = over(Math.min, Math.max);\r\nminMax(1, 2, 3, 4, 5); // [1,5]"
         },
         "tags": [
@@ -4592,7 +4592,7 @@
         "text": "Creates a function that invokes the provided function with its arguments transformed.\r\n\r\nUse `Array.prototype.map()` to apply `transforms` to `args` in combination with the spread operator (`...`) to pass the transformed arguments to `fn`.",
         "codeBlocks": {
           "es6": "const overArgs = (fn, transforms) => (...args) => fn(...args.map((val, i) => transforms[i](val)));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar overArgs = function overArgs(fn, transforms) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(args.map(function (val, i) {\n      return transforms[i](val);\n    })));\n  };\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar overArgs = function overArgs(fn, transforms) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(args.map(function (val, i) {\n      return transforms[i](val);\n    })));\n  };\n};",
           "example": "const square = n => n * n;\r\nconst double = n => n * 2;\r\nconst fn = overArgs((x, y) => [x, y], [square, double]);\r\nfn(9, 3); // [81, 6]"
         },
         "tags": [
@@ -4614,7 +4614,7 @@
         "text": "Pads a string on both sides with the specified character, if it's shorter than the specified length.\r\n\r\nUse `String.padStart()` and `String.padEnd()` to pad both sides of the given string.\r\nOmit the third argument, `char`, to use the whitespace character as the default padding character.",
         "codeBlocks": {
           "es6": "const pad = (str, length, char = ' ') =>\r\n  str.padStart((str.length + length) / 2, char).padEnd(length, char);",
-          "es5": "\"use strict\";\n\nvar pad = function pad(str, length) {\n  var char = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ' ';\n  return str.padStart((str.length + length) / 2, char).padEnd(length, char);\n};",
+          "es5": "var pad = function pad(str, length) {\n  var char = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : ' ';\n  return str.padStart((str.length + length) / 2, char).padEnd(length, char);\n};",
           "example": "pad('cat', 8); // '  cat   '\r\npad(String(42), 6, '0'); // '004200'\r\npad('foobar', 3); // 'foobar'"
         },
         "tags": [
@@ -4635,7 +4635,7 @@
         "text": "Returns `true` if the given string is a palindrome, `false` otherwise.\r\n\r\nConvert the string to `String.prototype.toLowerCase()` and use `String.prototype.replace()` to remove non-alphanumeric characters from it.\r\nThen, use the spread operator (`...`) to split the string into individual characters, `Array.prototype.reverse()`, `String.prototype.join('')` and compare it to the original, unreversed string, after converting it to `String.prototype.toLowerCase()`.",
         "codeBlocks": {
           "es6": "const palindrome = str => {\r\n  const s = str.toLowerCase().replace(/[\\W_]/g, '');\r\n  return s === [...s].reverse().join('');\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar palindrome = function palindrome(str) {\n  var s = str.toLowerCase().replace(/[\\W_]/g, '');\n  return s === _toConsumableArray(s).reverse().join('');\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar palindrome = function palindrome(str) {\n  var s = str.toLowerCase().replace(/[\\W_]/g, '');\n  return s === _toConsumableArray(s).reverse().join('');\n};",
           "example": "palindrome('taco cat'); // true"
         },
         "tags": [
@@ -4656,7 +4656,7 @@
         "text": "Parse an HTTP Cookie header string and return an object of all cookie name-value pairs.\r\n\r\nUse `String.prototype.split(';')` to separate key-value pairs from each other.\r\nUse `Array.prototype.map()` and `String.prototype.split('=')` to separate keys from values in each pair.\r\nUse `Array.prototype.reduce()` and `decodeURIComponent()` to create an object with all key-value pairs.",
         "codeBlocks": {
           "es6": "const parseCookie = str =>\r\n  str\r\n    .split(';')\r\n    .map(v => v.split('='))\r\n    .reduce((acc, v) => {\r\n      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());\r\n      return acc;\r\n    }, {});",
-          "es5": "\"use strict\";\n\nvar parseCookie = function parseCookie(str) {\n  return str.split(';').map(function (v) {\n    return v.split('=');\n  }).reduce(function (acc, v) {\n    acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());\n    return acc;\n  }, {});\n};",
+          "es5": "var parseCookie = function parseCookie(str) {\n  return str.split(';').map(function (v) {\n    return v.split('=');\n  }).reduce(function (acc, v) {\n    acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());\n    return acc;\n  }, {});\n};",
           "example": "parseCookie('foo=bar; equation=E%3Dmc%5E2'); // { foo: 'bar', equation: 'E=mc^2' }"
         },
         "tags": [
@@ -4678,7 +4678,7 @@
         "text": "Creates a function that invokes `fn` with `partials` prepended to the arguments it receives.\r\n\r\nUse the spread operator (`...`) to prepend `partials` to the list of arguments of `fn`.",
         "codeBlocks": {
           "es6": "const partial = (fn, ...partials) => (...args) => fn(...partials, ...args);",
-          "es5": "\"use strict\";\n\nvar partial = function partial(fn) {\n  for (var _len = arguments.length, partials = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    partials[_key - 1] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(void 0, partials.concat(args));\n  };\n};",
+          "es5": "var partial = function partial(fn) {\n  for (var _len = arguments.length, partials = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    partials[_key - 1] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(void 0, partials.concat(args));\n  };\n};",
           "example": "const greet = (greeting, name) => greeting + ' ' + name + '!';\r\nconst greetHello = partial(greet, 'Hello');\r\ngreetHello('John'); // 'Hello John!'"
         },
         "tags": [
@@ -4699,7 +4699,7 @@
         "text": "Creates a function that invokes `fn` with `partials` appended to the arguments it receives.\r\n\r\nUse the spread operator (`...`) to append `partials` to the list of arguments of `fn`.",
         "codeBlocks": {
           "es6": "const partialRight = (fn, ...partials) => (...args) => fn(...args, ...partials);",
-          "es5": "\"use strict\";\n\nvar partialRight = function partialRight(fn) {\n  for (var _len = arguments.length, partials = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    partials[_key - 1] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(void 0, args.concat(partials));\n  };\n};",
+          "es5": "var partialRight = function partialRight(fn) {\n  for (var _len = arguments.length, partials = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    partials[_key - 1] = arguments[_key];\n  }\n\n  return function () {\n    for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {\n      args[_key2] = arguments[_key2];\n    }\n\n    return fn.apply(void 0, args.concat(partials));\n  };\n};",
           "example": "const greet = (greeting, name) => greeting + ' ' + name + '!';\r\nconst greetJohn = partialRight(greet, 'John');\r\ngreetJohn('Hello'); // 'Hello John!'"
         },
         "tags": [
@@ -4720,7 +4720,7 @@
         "text": "Groups the elements into two arrays, depending on the provided function's truthiness for each element.\r\n\r\nUse `Array.prototype.reduce()` to create an array of two arrays.\r\nUse `Array.prototype.push()` to add elements for which `fn` returns `true` to the first array and elements for which `fn` returns `false` to the second one.",
         "codeBlocks": {
           "es6": "const partition = (arr, fn) =>\r\n  arr.reduce(\r\n    (acc, val, i, arr) => {\r\n      acc[fn(val, i, arr) ? 0 : 1].push(val);\r\n      return acc;\r\n    },\r\n    [[], []]\r\n  );",
-          "es5": "\"use strict\";\n\nvar partition = function partition(arr, fn) {\n  return arr.reduce(function (acc, val, i, arr) {\n    acc[fn(val, i, arr) ? 0 : 1].push(val);\n    return acc;\n  }, [[], []]);\n};",
+          "es5": "var partition = function partition(arr, fn) {\n  return arr.reduce(function (acc, val, i, arr) {\n    acc[fn(val, i, arr) ? 0 : 1].push(val);\n    return acc;\n  }, [[], []]);\n};",
           "example": "const users = [{ user: 'barney', age: 36, active: false }, { user: 'fred', age: 40, active: true }];\r\npartition(users, o => o.active); // [[{ 'user': 'fred',    'age': 40, 'active': true }],[{ 'user': 'barney',  'age': 36, 'active': false }]]"
         },
         "tags": [
@@ -4743,7 +4743,7 @@
         "text": "Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value.\r\n\r\nUse `Array.prototype.reduce()` to calculate how many numbers are below the value and how many are the same value and apply the percentile formula.",
         "codeBlocks": {
           "es6": "const percentile = (arr, val) =>\r\n  (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;",
-          "es5": "\"use strict\";\n\nvar percentile = function percentile(arr, val) {\n  return 100 * arr.reduce(function (acc, v) {\n    return acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0);\n  }, 0) / arr.length;\n};",
+          "es5": "var percentile = function percentile(arr, val) {\n  return 100 * arr.reduce(function (acc, v) {\n    return acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0);\n  }, 0) / arr.length;\n};",
           "example": "percentile([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], 6); // 55"
         },
         "tags": [
@@ -4764,7 +4764,7 @@
         "text": "⚠️ **WARNING**: This function's execution time increases exponentially with each array element. Anything more than 8 to 10 entries will cause your browser to hang as it tries to solve all the different combinations.\r\n\r\nGenerates all permutations of an array's elements (contains duplicates).\r\n\r\nUse recursion.\r\nFor each element in the given array, create all the partial permutations for the rest of its elements.\r\nUse `Array.prototype.map()` to combine the element with each partial permutation, then `Array.prototype.reduce()` to combine all permutations in one array.\r\nBase cases are for array `length` equal to `2` or `1`.",
         "codeBlocks": {
           "es6": "const permutations = arr => {\r\n  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;\r\n  return arr.reduce(\r\n    (acc, item, i) =>\r\n      acc.concat(\r\n        permutations([...arr.slice(0, i), ...arr.slice(i + 1)]).map(val => [item, ...val])\r\n      ),\r\n    []\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar permutations = function permutations(arr) {\n  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;\n  return arr.reduce(function (acc, item, i) {\n    return acc.concat(permutations(_toConsumableArray(arr.slice(0, i)).concat(_toConsumableArray(arr.slice(i + 1)))).map(function (val) {\n      return [item].concat(_toConsumableArray(val));\n    }));\n  }, []);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar permutations = function permutations(arr) {\n  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;\n  return arr.reduce(function (acc, item, i) {\n    return acc.concat(permutations(_toConsumableArray(arr.slice(0, i)).concat(_toConsumableArray(arr.slice(i + 1)))).map(function (val) {\n      return [item].concat(_toConsumableArray(val));\n    }));\n  }, []);\n};",
           "example": "permutations([1, 33, 5]); // [ [ 1, 33, 5 ], [ 1, 5, 33 ], [ 33, 1, 5 ], [ 33, 5, 1 ], [ 5, 1, 33 ], [ 5, 33, 1 ] ]"
         },
         "tags": [
@@ -4786,7 +4786,7 @@
         "text": "Picks the key-value pairs corresponding to the given keys from an object.\r\n\r\nUse `Array.prototype.reduce()` to convert the filtered/picked keys back to an object with the corresponding key-value pairs if the key exists in the object.",
         "codeBlocks": {
           "es6": "const pick = (obj, arr) =>\r\n  arr.reduce((acc, curr) => (curr in obj && (acc[curr] = obj[curr]), acc), {});",
-          "es5": "\"use strict\";\n\nvar pick = function pick(obj, arr) {\n  return arr.reduce(function (acc, curr) {\n    return curr in obj && (acc[curr] = obj[curr]), acc;\n  }, {});\n};",
+          "es5": "var pick = function pick(obj, arr) {\n  return arr.reduce(function (acc, curr) {\n    return curr in obj && (acc[curr] = obj[curr]), acc;\n  }, {});\n};",
           "example": "pick({ a: 1, b: '2', c: 3 }, ['a', 'c']); // { 'a': 1, 'c': 3 }"
         },
         "tags": [
@@ -4808,7 +4808,7 @@
         "text": "Creates an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key).\r\n\r\nUse `Object.keys(obj)` and `Array.prototype.filter()`to remove the keys for which `fn` returns a falsey value.\r\nUse `Array.prototype.reduce()` to convert the filtered keys back to an object with the corresponding key-value pairs.",
         "codeBlocks": {
           "es6": "const pickBy = (obj, fn) =>\r\n  Object.keys(obj)\r\n    .filter(k => fn(obj[k], k))\r\n    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});",
-          "es5": "\"use strict\";\n\nvar pickBy = function pickBy(obj, fn) {\n  return Object.keys(obj).filter(function (k) {\n    return fn(obj[k], k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
+          "es5": "var pickBy = function pickBy(obj, fn) {\n  return Object.keys(obj).filter(function (k) {\n    return fn(obj[k], k);\n  }).reduce(function (acc, key) {\n    return acc[key] = obj[key], acc;\n  }, {});\n};",
           "example": "pickBy({ a: 1, b: '2', c: 3 }, x => typeof x === 'number'); // { 'a': 1, 'c': 3 }"
         },
         "tags": [
@@ -4831,8 +4831,8 @@
         "text": "Performs left-to-right function composition for asynchronous functions.\r\n\r\nUse `Array.prototype.reduce()` with the spread operator (`...`) to perform left-to-right function composition using `Promise.then()`.\r\nThe functions can return a combination of: simple values, `Promise`'s, or they can be defined as `async` ones returning through `await`.\r\nAll functions must be unary.",
         "codeBlocks": {
           "es6": "const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));",
-          "es5": "\"use strict\";\n\nvar pipeAsyncFunctions = function pipeAsyncFunctions() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return function (arg) {\n    return fns.reduce(function (p, f) {\n      return p.then(f);\n    }, Promise.resolve(arg));\n  };\n};",
-          "example": "const sum = pipeAsyncFunctions(\r\n  x => x + 1,\r\n  x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\r\n  x => x + 3,\r\n  async x => (await x) + 4\r\n);\r\n(async () => {\r\n  console.log(await sum(5)); // 15 (after one second)\r\n})();"
+          "es5": "var pipeAsyncFunctions = function pipeAsyncFunctions() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return function (arg) {\n    return fns.reduce(function (p, f) {\n      return p.then(f);\n    }, Promise.resolve(arg));\n  };\n};",
+          "example": "const sum = pipeAsyncFunctions(\r\n  x => x + 1,\r\n  x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\r\n  x => x + 3,\r\n  async x => (await x) + 4\r\n);\r\n(async() => {\r\n  console.log(await sum(5)); // 15 (after one second)\r\n})();"
         },
         "tags": [
           "adapter",
@@ -4843,7 +4843,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "12276cbe7dde6659e4ab67ed3fbe81ac57d1e7766b41dc879f946f226b7b76ab"
+        "hash": "6a7d303a9761c57b32f977b8068de4fd9bd9ea72167df268220d13250d1483e5"
       }
     },
     {
@@ -4854,7 +4854,7 @@
         "text": "Performs left-to-right function composition.\r\n\r\nUse `Array.prototype.reduce()` with the spread operator (`...`) to perform left-to-right function composition.\r\nThe first (leftmost) function can accept one or more arguments; the remaining functions must be unary.",
         "codeBlocks": {
           "es6": "const pipeFunctions = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));",
-          "es5": "\"use strict\";\n\nvar pipeFunctions = function pipeFunctions() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return g(f.apply(void 0, arguments));\n    };\n  });\n};",
+          "es5": "var pipeFunctions = function pipeFunctions() {\n  for (var _len = arguments.length, fns = new Array(_len), _key = 0; _key < _len; _key++) {\n    fns[_key] = arguments[_key];\n  }\n\n  return fns.reduce(function (f, g) {\n    return function () {\n      return g(f.apply(void 0, arguments));\n    };\n  });\n};",
           "example": "const add5 = x => x + 5;\r\nconst multiply = (x, y) => x * y;\r\nconst multiplyAndAdd5 = pipeFunctions(multiply, add5);\r\nmultiplyAndAdd5(5, 2); // 15"
         },
         "tags": [
@@ -4876,7 +4876,7 @@
         "text": "Returns the singular or plural form of the word based on the input number. If the first argument is an `object`, it will use a closure by returning a function that can auto-pluralize words that don't simply end in `s` if the supplied dictionary contains the word.\r\n\r\nIf `num` is either `-1` or `1`, return the singular form of the word. If `num` is any other number, return the plural form. Omit the third argument to use the default of the singular word + `s`, or supply a custom pluralized word when necessary. If the first argument is an `object`, utilize a closure by returning a function which can use the supplied dictionary to resolve the correct plural form of the word.",
         "codeBlocks": {
           "es6": "const pluralize = (val, word, plural = word + 's') => {\r\n  const _pluralize = (num, word, plural = word + 's') =>\r\n    [1, -1].includes(Number(num)) ? word : plural;\r\n  if (typeof val === 'object') return (num, word) => _pluralize(num, word, val[word]);\r\n  return _pluralize(val, word, plural);\r\n};",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar pluralize = function pluralize(val, word) {\n  var plural = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : word + 's';\n\n  var _pluralize = function _pluralize(num, word) {\n    var plural = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : word + 's';\n    return [1, -1].includes(Number(num)) ? word : plural;\n  };\n\n  if (_typeof(val) === 'object') return function (num, word) {\n    return _pluralize(num, word, val[word]);\n  };\n  return _pluralize(val, word, plural);\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar pluralize = function pluralize(val, word) {\n  var plural = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : word + 's';\n\n  var _pluralize = function _pluralize(num, word) {\n    var plural = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : word + 's';\n    return [1, -1].includes(Number(num)) ? word : plural;\n  };\n\n  if (_typeof(val) === 'object') return function (num, word) {\n    return _pluralize(num, word, val[word]);\n  };\n  return _pluralize(val, word, plural);\n};",
           "example": "pluralize(0, 'apple'); // 'apples'\r\npluralize(1, 'apple'); // 'apple'\r\npluralize(2, 'apple'); // 'apples'\r\npluralize(2, 'person', 'people'); // 'people'\r\n\r\nconst PLURALS = {\r\n  person: 'people',\r\n  radius: 'radii'\r\n};\r\nconst autoPluralize = pluralize(PLURALS);\r\nautoPluralize(2, 'person'); // 'people'"
         },
         "tags": [
@@ -4897,7 +4897,7 @@
         "text": "Returns the powerset of a given array of numbers.\r\n\r\nUse `Array.prototype.reduce()` combined with `Array.prototype.map()` to iterate over elements and combine into an array containing all combinations.",
         "codeBlocks": {
           "es6": "const powerset = arr => arr.reduce((a, v) => a.concat(a.map(r => [v].concat(r))), [[]]);",
-          "es5": "\"use strict\";\n\nvar powerset = function powerset(arr) {\n  return arr.reduce(function (a, v) {\n    return a.concat(a.map(function (r) {\n      return [v].concat(r);\n    }));\n  }, [[]]);\n};",
+          "es5": "var powerset = function powerset(arr) {\n  return arr.reduce(function (a, v) {\n    return a.concat(a.map(function (r) {\n      return [v].concat(r);\n    }));\n  }, [[]]);\n};",
           "example": "powerset([1, 2]); // [[], [1], [2], [2, 1]]"
         },
         "tags": [
@@ -4918,7 +4918,7 @@
         "text": "Returns the prefixed version (if necessary) of a CSS property that the browser supports.\r\n\r\nUse `Array.prototype.findIndex()` on an array of vendor prefix strings to test if `document.body` has one of them defined in its `CSSStyleDeclaration` object, otherwise return `null`.\r\nUse `String.prototype.charAt()` and `String.prototype.toUpperCase()` to capitalize the property, which will be appended to the vendor prefix string.",
         "codeBlocks": {
           "es6": "const prefix = prop => {\r\n  const capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);\r\n  const prefixes = ['', 'webkit', 'moz', 'ms', 'o'];\r\n  const i = prefixes.findIndex(\r\n    prefix => typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined'\r\n  );\r\n  return i !== -1 ? (i === 0 ? prop : prefixes[i] + capitalizedProp) : null;\r\n};",
-          "es5": "\"use strict\";\n\nvar prefix = function prefix(prop) {\n  var capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);\n  var prefixes = ['', 'webkit', 'moz', 'ms', 'o'];\n  var i = prefixes.findIndex(function (prefix) {\n    return typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined';\n  });\n  return i !== -1 ? i === 0 ? prop : prefixes[i] + capitalizedProp : null;\n};",
+          "es5": "var prefix = function prefix(prop) {\n  var capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);\n  var prefixes = ['', 'webkit', 'moz', 'ms', 'o'];\n  var i = prefixes.findIndex(function (prefix) {\n    return typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined';\n  });\n  return i !== -1 ? i === 0 ? prop : prefixes[i] + capitalizedProp : null;\n};",
           "example": "prefix('appearance'); // 'appearance' on a supported browser, otherwise 'webkitAppearance', 'mozAppearance', 'msAppearance' or 'oAppearance'"
         },
         "tags": [
@@ -4940,7 +4940,7 @@
         "text": "Converts a number in bytes to a human-readable string.\r\n\r\nUse an array dictionary of units to be accessed based on the exponent.\r\nUse `Number.toPrecision()` to truncate the number to a certain number of digits.\r\nReturn the prettified string by building it up, taking into account the supplied options and whether it is negative or not.\r\nOmit the second argument, `precision`, to use a default precision of `3` digits.\r\nOmit the third argument, `addSpace`, to add space between the number and unit by default.",
         "codeBlocks": {
           "es6": "const prettyBytes = (num, precision = 3, addSpace = true) => {\r\n  const UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];\r\n  if (Math.abs(num) < 1) return num + (addSpace ? ' ' : '') + UNITS[0];\r\n  const exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);\r\n  const n = Number(((num < 0 ? -num : num) / 1000 ** exponent).toPrecision(precision));\r\n  return (num < 0 ? '-' : '') + n + (addSpace ? ' ' : '') + UNITS[exponent];\r\n};",
-          "es5": "\"use strict\";\n\nvar prettyBytes = function prettyBytes(num) {\n  var precision = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 3;\n  var addSpace = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;\n  var UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];\n  if (Math.abs(num) < 1) return num + (addSpace ? ' ' : '') + UNITS[0];\n  var exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);\n  var n = Number(((num < 0 ? -num : num) / Math.pow(1000, exponent)).toPrecision(precision));\n  return (num < 0 ? '-' : '') + n + (addSpace ? ' ' : '') + UNITS[exponent];\n};",
+          "es5": "var prettyBytes = function prettyBytes(num) {\n  var precision = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 3;\n  var addSpace = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;\n  var UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];\n  if (Math.abs(num) < 1) return num + (addSpace ? ' ' : '') + UNITS[0];\n  var exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);\n  var n = Number(((num < 0 ? -num : num) / Math.pow(1000, exponent)).toPrecision(precision));\n  return (num < 0 ? '-' : '') + n + (addSpace ? ' ' : '') + UNITS[exponent];\n};",
           "example": "prettyBytes(1000); // \"1 KB\"\r\nprettyBytes(-27145424323.5821, 5); // \"-27.145 GB\"\r\nprettyBytes(123456789, 3, false); // \"123MB\""
         },
         "tags": [
@@ -4963,7 +4963,7 @@
         "text": "Generates primes up to a given number, using the Sieve of Eratosthenes.\r\n\r\nGenerate an array from `2` to the given number. Use `Array.prototype.filter()` to filter out the values divisible by any number from `2` to the square root of the provided number.",
         "codeBlocks": {
           "es6": "const primes = num => {\r\n  let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),\r\n    sqroot = Math.floor(Math.sqrt(num)),\r\n    numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);\r\n  numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y === x)));\r\n  return arr;\r\n};",
-          "es5": "\"use strict\";\n\nvar primes = function primes(num) {\n  var arr = Array.from({\n    length: num - 1\n  }).map(function (x, i) {\n    return i + 2;\n  }),\n      sqroot = Math.floor(Math.sqrt(num)),\n      numsTillSqroot = Array.from({\n    length: sqroot - 1\n  }).map(function (x, i) {\n    return i + 2;\n  });\n  numsTillSqroot.forEach(function (x) {\n    return arr = arr.filter(function (y) {\n      return y % x !== 0 || y === x;\n    });\n  });\n  return arr;\n};",
+          "es5": "var primes = function primes(num) {\n  var arr = Array.from({\n    length: num - 1\n  }).map(function (x, i) {\n    return i + 2;\n  }),\n      sqroot = Math.floor(Math.sqrt(num)),\n      numsTillSqroot = Array.from({\n    length: sqroot - 1\n  }).map(function (x, i) {\n    return i + 2;\n  });\n  numsTillSqroot.forEach(function (x) {\n    return arr = arr.filter(function (y) {\n      return y % x !== 0 || y === x;\n    });\n  });\n  return arr;\n};",
           "example": "primes(10); // [2,3,5,7]"
         },
         "tags": [
@@ -4985,7 +4985,7 @@
         "text": "Converts an asynchronous function to return a promise.\r\n\r\nUse currying to return a function returning a `Promise` that calls the original function.\r\nUse the `...rest` operator to pass in all the parameters.\r\n\r\n*In Node 8+, you can use [`util.promisify`](https://nodejs.org/api/util.html#util_util_promisify_original)*",
         "codeBlocks": {
           "es6": "const promisify = func => (...args) =>\r\n  new Promise((resolve, reject) =>\r\n    func(...args, (err, result) => (err ? reject(err) : resolve(result)))\r\n  );",
-          "es5": "\"use strict\";\n\nvar promisify = function promisify(func) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return new Promise(function (resolve, reject) {\n      return func.apply(void 0, args.concat([function (err, result) {\n        return err ? reject(err) : resolve(result);\n      }]));\n    });\n  };\n};",
+          "es5": "var promisify = function promisify(func) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return new Promise(function (resolve, reject) {\n      return func.apply(void 0, args.concat([function (err, result) {\n        return err ? reject(err) : resolve(result);\n      }]));\n    });\n  };\n};",
           "example": "const delay = promisify((d, cb) => setTimeout(cb, d));\r\ndelay(2000).then(() => console.log('Hi!')); // // Promise resolves after 2s"
         },
         "tags": [
@@ -5008,7 +5008,7 @@
         "text": "Mutates the original array to filter out the values specified.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.\r\nUse `Array.prototype.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.prototype.push()` to re-populate it with only the pulled values.\r\n\r\n_(For a snippet that does not mutate the original array see [`without`](#without))_",
         "codeBlocks": {
           "es6": "const pull = (arr, ...args) => {\r\n  let argState = Array.isArray(args[0]) ? args[0] : args;\r\n  let pulled = arr.filter((v, i) => !argState.includes(v));\r\n  arr.length = 0;\r\n  pulled.forEach(v => arr.push(v));\r\n};",
-          "es5": "\"use strict\";\n\nvar pull = function pull(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  var argState = Array.isArray(args[0]) ? args[0] : args;\n  var pulled = arr.filter(function (v, i) {\n    return !argState.includes(v);\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n};",
+          "es5": "var pull = function pull(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  var argState = Array.isArray(args[0]) ? args[0] : args;\n  var pulled = arr.filter(function (v, i) {\n    return !argState.includes(v);\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n};",
           "example": "let myArray = ['a', 'b', 'c', 'a', 'b', 'c'];\r\npull(myArray, 'a', 'c'); // myArray = [ 'b', 'b' ]"
         },
         "tags": [
@@ -5029,7 +5029,7 @@
         "text": "Mutates the original array to filter out the values at the specified indexes.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.\r\nUse `Array.prototype.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.prototype.push()` to re-populate it with only the pulled values.\r\nUse `Array.prototype.push()` to keep track of pulled values",
         "codeBlocks": {
           "es6": "const pullAtIndex = (arr, pullArr) => {\r\n  let removed = [];\r\n  let pulled = arr\r\n    .map((v, i) => (pullArr.includes(i) ? removed.push(v) : v))\r\n    .filter((v, i) => !pullArr.includes(i));\r\n  arr.length = 0;\r\n  pulled.forEach(v => arr.push(v));\r\n  return removed;\r\n};",
-          "es5": "\"use strict\";\n\nvar pullAtIndex = function pullAtIndex(arr, pullArr) {\n  var removed = [];\n  var pulled = arr.map(function (v, i) {\n    return pullArr.includes(i) ? removed.push(v) : v;\n  }).filter(function (v, i) {\n    return !pullArr.includes(i);\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n  return removed;\n};",
+          "es5": "var pullAtIndex = function pullAtIndex(arr, pullArr) {\n  var removed = [];\n  var pulled = arr.map(function (v, i) {\n    return pullArr.includes(i) ? removed.push(v) : v;\n  }).filter(function (v, i) {\n    return !pullArr.includes(i);\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n  return removed;\n};",
           "example": "let myArray = ['a', 'b', 'c', 'd'];\r\nlet pulled = pullAtIndex(myArray, [1, 3]); // myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]"
         },
         "tags": [
@@ -5050,7 +5050,7 @@
         "text": "Mutates the original array to filter out the values specified. Returns the removed elements.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.\r\nUse `Array.prototype.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.prototype.push()` to re-populate it with only the pulled values.\r\nUse `Array.prototype.push()` to keep track of pulled values",
         "codeBlocks": {
           "es6": "const pullAtValue = (arr, pullArr) => {\r\n  let removed = [],\r\n    pushToRemove = arr.forEach((v, i) => (pullArr.includes(v) ? removed.push(v) : v)),\r\n    mutateTo = arr.filter((v, i) => !pullArr.includes(v));\r\n  arr.length = 0;\r\n  mutateTo.forEach(v => arr.push(v));\r\n  return removed;\r\n};",
-          "es5": "\"use strict\";\n\nvar pullAtValue = function pullAtValue(arr, pullArr) {\n  var removed = [],\n      pushToRemove = arr.forEach(function (v, i) {\n    return pullArr.includes(v) ? removed.push(v) : v;\n  }),\n      mutateTo = arr.filter(function (v, i) {\n    return !pullArr.includes(v);\n  });\n  arr.length = 0;\n  mutateTo.forEach(function (v) {\n    return arr.push(v);\n  });\n  return removed;\n};",
+          "es5": "var pullAtValue = function pullAtValue(arr, pullArr) {\n  var removed = [],\n      pushToRemove = arr.forEach(function (v, i) {\n    return pullArr.includes(v) ? removed.push(v) : v;\n  }),\n      mutateTo = arr.filter(function (v, i) {\n    return !pullArr.includes(v);\n  });\n  arr.length = 0;\n  mutateTo.forEach(function (v) {\n    return arr.push(v);\n  });\n  return removed;\n};",
           "example": "let myArray = ['a', 'b', 'c', 'd'];\r\nlet pulled = pullAtValue(myArray, ['b', 'd']); // myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]"
         },
         "tags": [
@@ -5071,7 +5071,7 @@
         "text": "Mutates the original array to filter out the values specified, based on a given iterator function.\r\n\r\nCheck if the last argument provided in a function.\r\nUse `Array.prototype.map()` to apply the iterator function `fn` to all array elements.\r\nUse `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.\r\nUse `Array.prototype.length = 0` to mutate the passed in an array by resetting it's length to zero and `Array.prototype.push()` to re-populate it with only the pulled values.",
         "codeBlocks": {
           "es6": "const pullBy = (arr, ...args) => {\r\n  const length = args.length;\r\n  let fn = length > 1 ? args[length - 1] : undefined;\r\n  fn = typeof fn == 'function' ? (args.pop(), fn) : undefined;\r\n  let argState = (Array.isArray(args[0]) ? args[0] : args).map(val => fn(val));\r\n  let pulled = arr.filter((v, i) => !argState.includes(fn(v)));\r\n  arr.length = 0;\r\n  pulled.forEach(v => arr.push(v));\r\n};",
-          "es5": "\"use strict\";\n\nvar pullBy = function pullBy(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  var length = args.length;\n  var fn = length > 1 ? args[length - 1] : undefined;\n  fn = typeof fn == 'function' ? (args.pop(), fn) : undefined;\n  var argState = (Array.isArray(args[0]) ? args[0] : args).map(function (val) {\n    return fn(val);\n  });\n  var pulled = arr.filter(function (v, i) {\n    return !argState.includes(fn(v));\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n};",
+          "es5": "var pullBy = function pullBy(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  var length = args.length;\n  var fn = length > 1 ? args[length - 1] : undefined;\n  fn = typeof fn == 'function' ? (args.pop(), fn) : undefined;\n  var argState = (Array.isArray(args[0]) ? args[0] : args).map(function (val) {\n    return fn(val);\n  });\n  var pulled = arr.filter(function (v, i) {\n    return !argState.includes(fn(v));\n  });\n  arr.length = 0;\n  pulled.forEach(function (v) {\n    return arr.push(v);\n  });\n};",
           "example": "var myArray = [{ x: 1 }, { x: 2 }, { x: 3 }, { x: 1 }];\r\npullBy(myArray, [{ x: 1 }, { x: 3 }], o => o.x); // myArray = [{ x: 2 }]"
         },
         "tags": [
@@ -5093,7 +5093,7 @@
         "text": "Converts an angle from radians to degrees.\r\n\r\nUse `Math.PI` and the radian to degree formula to convert the angle from radians to degrees.",
         "codeBlocks": {
           "es6": "const radsToDegrees = rad => (rad * 180.0) / Math.PI;",
-          "es5": "\"use strict\";\n\nvar radsToDegrees = function radsToDegrees(rad) {\n  return rad * 180.0 / Math.PI;\n};",
+          "es5": "var radsToDegrees = function radsToDegrees(rad) {\n  return rad * 180.0 / Math.PI;\n};",
           "example": "radsToDegrees(Math.PI / 2); // 90"
         },
         "tags": [
@@ -5114,7 +5114,7 @@
         "text": "Generates a random hexadecimal color code.\r\n\r\nUse `Math.random` to generate a random 24-bit(6x4bits) hexadecimal number. Use bit shifting and then convert it to an hexadecimal String using `toString(16)`.",
         "codeBlocks": {
           "es6": "const randomHexColorCode = () => {\r\n  let n = (Math.random() * 0xfffff * 1000000).toString(16);\r\n  return '#' + n.slice(0, 6);\r\n};",
-          "es5": "\"use strict\";\n\nvar randomHexColorCode = function randomHexColorCode() {\n  var n = (Math.random() * 0xfffff * 1000000).toString(16);\n  return '#' + n.slice(0, 6);\n};",
+          "es5": "var randomHexColorCode = function randomHexColorCode() {\n  var n = (Math.random() * 0xfffff * 1000000).toString(16);\n  return '#' + n.slice(0, 6);\n};",
           "example": "randomHexColorCode(); // \"#e34155\""
         },
         "tags": [
@@ -5136,7 +5136,7 @@
         "text": "Returns an array of n random integers in the specified range.\r\n\r\nUse `Array.from()` to create an empty array of the specific length, `Math.random()` to generate a random number and map it to the desired range, using `Math.floor()` to make it an integer.",
         "codeBlocks": {
           "es6": "const randomIntArrayInRange = (min, max, n = 1) =>\r\n  Array.from({ length: n }, () => Math.floor(Math.random() * (max - min + 1)) + min);",
-          "es5": "\"use strict\";\n\nvar randomIntArrayInRange = function randomIntArrayInRange(min, max) {\n  var n = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: n\n  }, function () {\n    return Math.floor(Math.random() * (max - min + 1)) + min;\n  });\n};",
+          "es5": "var randomIntArrayInRange = function randomIntArrayInRange(min, max) {\n  var n = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array.from({\n    length: n\n  }, function () {\n    return Math.floor(Math.random() * (max - min + 1)) + min;\n  });\n};",
           "example": "randomIntArrayInRange(12, 35, 10); // [ 34, 14, 27, 17, 30, 27, 20, 26, 21, 14 ]"
         },
         "tags": [
@@ -5159,7 +5159,7 @@
         "text": "Returns a random integer in the specified range.\r\n\r\nUse `Math.random()` to generate a random number and map it to the desired range, using `Math.floor()` to make it an integer.",
         "codeBlocks": {
           "es6": "const randomIntegerInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;",
-          "es5": "\"use strict\";\n\nvar randomIntegerInRange = function randomIntegerInRange(min, max) {\n  return Math.floor(Math.random() * (max - min + 1)) + min;\n};",
+          "es5": "var randomIntegerInRange = function randomIntegerInRange(min, max) {\n  return Math.floor(Math.random() * (max - min + 1)) + min;\n};",
           "example": "randomIntegerInRange(0, 5); // 2"
         },
         "tags": [
@@ -5182,7 +5182,7 @@
         "text": "Returns a random number in the specified range.\r\n\r\nUse `Math.random()` to generate a random value, map it to the desired range using multiplication.",
         "codeBlocks": {
           "es6": "const randomNumberInRange = (min, max) => Math.random() * (max - min) + min;",
-          "es5": "\"use strict\";\n\nvar randomNumberInRange = function randomNumberInRange(min, max) {\n  return Math.random() * (max - min) + min;\n};",
+          "es5": "var randomNumberInRange = function randomNumberInRange(min, max) {\n  return Math.random() * (max - min) + min;\n};",
           "example": "randomNumberInRange(2, 10); // 6.0211363285087005"
         },
         "tags": [
@@ -5205,7 +5205,7 @@
         "text": "Returns an array of lines from the specified file.\r\n\r\nUse `readFileSync` function in `fs` node package to create a `Buffer` from a file.\r\nconvert buffer to string using `toString(encoding)` function.\r\ncreating an array from contents of file by `split`ing file content line by line (each `\\n`).",
         "codeBlocks": {
           "es6": "const fs = require('fs');\r\nconst readFileLines = filename =>\r\n  fs\r\n    .readFileSync(filename)\r\n    .toString('UTF8')\r\n    .split('\\n');",
-          "es5": "\"use strict\";\n\nvar fs = require('fs');\n\nvar readFileLines = function readFileLines(filename) {\n  return fs.readFileSync(filename).toString('UTF8').split('\\n');\n};",
+          "es5": "var fs = require('fs');\n\nvar readFileLines = function readFileLines(filename) {\n  return fs.readFileSync(filename).toString('UTF8').split('\\n');\n};",
           "example": "/*\r\ncontents of test.txt :\r\n  line1\r\n  line2\r\n  line3\r\n  ___________________________\r\n*/\r\nlet arr = readFileLines('test.txt');\r\nconsole.log(arr); // ['line1', 'line2', 'line3']"
         },
         "tags": [
@@ -5228,7 +5228,7 @@
         "text": "Creates a function that invokes the provided function with its arguments arranged according to the specified indexes.\r\n\r\nUse `Array.prototype.map()` to reorder arguments based on `indexes` in combination with the spread operator (`...`) to pass the transformed arguments to `fn`.",
         "codeBlocks": {
           "es6": "const rearg = (fn, indexes) => (...args) => fn(...indexes.map(i => args[i]));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar rearg = function rearg(fn, indexes) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(indexes.map(function (i) {\n      return args[i];\n    })));\n  };\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar rearg = function rearg(fn, indexes) {\n  return function () {\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    return fn.apply(void 0, _toConsumableArray(indexes.map(function (i) {\n      return args[i];\n    })));\n  };\n};",
           "example": "var rearged = rearg(\r\n  function(a, b, c) {\r\n    return [a, b, c];\r\n  },\r\n  [2, 0, 1]\r\n);\r\nrearged('b', 'c', 'a'); // ['a', 'b', 'c']"
         },
         "tags": [
@@ -5250,7 +5250,7 @@
         "text": "Invokes the provided callback on each animation frame.\r\n\r\nUse recursion. \r\nProvided that `running` is `true`, continue invoking `window.requestAnimationFrame()` which invokes the provided callback. \r\nReturn an object with two methods `start` and `stop` to allow manual control of the recording. \r\nOmit the second argument, `autoStart`, to implicitly call `start` when the function is invoked.",
         "codeBlocks": {
           "es6": "const recordAnimationFrames = (callback, autoStart = true) => {\r\n  let running = true,\r\n    raf;\r\n  const stop = () => {\r\n    running = false;\r\n    cancelAnimationFrame(raf);\r\n  };\r\n  const start = () => {\r\n    running = true;\r\n    run();\r\n  };\r\n  const run = () => {\r\n    raf = requestAnimationFrame(() => {\r\n      callback();\r\n      if (running) run();\r\n    });\r\n  };\r\n  if (autoStart) start();\r\n  return { start, stop };\r\n};",
-          "es5": "\"use strict\";\n\nvar recordAnimationFrames = function recordAnimationFrames(callback) {\n  var autoStart = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;\n  var running = true,\n      raf;\n\n  var stop = function stop() {\n    running = false;\n    cancelAnimationFrame(raf);\n  };\n\n  var start = function start() {\n    running = true;\n    run();\n  };\n\n  var run = function run() {\n    raf = requestAnimationFrame(function () {\n      callback();\n      if (running) run();\n    });\n  };\n\n  if (autoStart) start();\n  return {\n    start: start,\n    stop: stop\n  };\n};",
+          "es5": "var recordAnimationFrames = function recordAnimationFrames(callback) {\n  var autoStart = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;\n  var running = true,\n      raf;\n\n  var stop = function stop() {\n    running = false;\n    cancelAnimationFrame(raf);\n  };\n\n  var start = function start() {\n    running = true;\n    run();\n  };\n\n  var run = function run() {\n    raf = requestAnimationFrame(function () {\n      callback();\n      if (running) run();\n    });\n  };\n\n  if (autoStart) start();\n  return {\n    start: start,\n    stop: stop\n  };\n};",
           "example": "const cb = () => console.log('Animation frame fired');\r\nconst recorder = recordAnimationFrames(cb); // logs 'Animation frame fired' on each animation frame\r\nrecorder.stop(); // stops logging\r\nrecorder.start(); // starts again\r\nconst recorder2 = recordAnimationFrames(cb, false); // `start` needs to be explicitly called to begin recording frames"
         },
         "tags": [
@@ -5272,7 +5272,7 @@
         "text": "Redirects to a specified URL.\r\n\r\nUse `window.location.href` or `window.location.replace()` to redirect to `url`.\r\nPass a second argument to simulate a link click (`true` - default) or an HTTP redirect (`false`).",
         "codeBlocks": {
           "es6": "const redirect = (url, asLink = true) =>\r\n  asLink ? (window.location.href = url) : window.location.replace(url);",
-          "es5": "\"use strict\";\n\nvar redirect = function redirect(url) {\n  var asLink = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;\n  return asLink ? window.location.href = url : window.location.replace(url);\n};",
+          "es5": "var redirect = function redirect(url) {\n  var asLink = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;\n  return asLink ? window.location.href = url : window.location.replace(url);\n};",
           "example": "redirect('https://google.com');"
         },
         "tags": [
@@ -5294,7 +5294,7 @@
         "text": "Filter an array of objects based on a condition while also filtering out unspecified keys.\r\n\r\nUse `Array.prototype.filter()` to filter the array based on the predicate `fn` so that it returns the objects for which the condition returned a truthy value.\r\nOn the filtered array, use `Array.prototype.map()` to return the new object using `Array.prototype.reduce()` to filter out the keys which were not supplied as the `keys` argument.",
         "codeBlocks": {
           "es6": "const reducedFilter = (data, keys, fn) =>\r\n  data.filter(fn).map(el =>\r\n    keys.reduce((acc, key) => {\r\n      acc[key] = el[key];\r\n      return acc;\r\n    }, {})\r\n  );",
-          "es5": "\"use strict\";\n\nvar reducedFilter = function reducedFilter(data, keys, fn) {\n  return data.filter(fn).map(function (el) {\n    return keys.reduce(function (acc, key) {\n      acc[key] = el[key];\n      return acc;\n    }, {});\n  });\n};",
+          "es5": "var reducedFilter = function reducedFilter(data, keys, fn) {\n  return data.filter(fn).map(function (el) {\n    return keys.reduce(function (acc, key) {\n      acc[key] = el[key];\n      return acc;\n    }, {});\n  });\n};",
           "example": "const data = [\r\n  {\r\n    id: 1,\r\n    name: 'john',\r\n    age: 24\r\n  },\r\n  {\r\n    id: 2,\r\n    name: 'mike',\r\n    age: 50\r\n  }\r\n];\r\n\r\nreducedFilter(data, ['id', 'name'], item => item.age > 24); // [{ id: 2, name: 'mike'}]"
         },
         "tags": [
@@ -5315,7 +5315,7 @@
         "text": "Applies a function against an accumulator and each element in the array (from left to right), returning an array of successively reduced values.\r\n\r\nUse `Array.prototype.reduce()` to apply the given function to the given array, storing each new result.",
         "codeBlocks": {
           "es6": "const reduceSuccessive = (arr, fn, acc) =>\r\n  arr.reduce((res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res), [acc]);",
-          "es5": "\"use strict\";\n\nvar reduceSuccessive = function reduceSuccessive(arr, fn, acc) {\n  return arr.reduce(function (res, val, i, arr) {\n    return res.push(fn(res.slice(-1)[0], val, i, arr)), res;\n  }, [acc]);\n};",
+          "es5": "var reduceSuccessive = function reduceSuccessive(arr, fn, acc) {\n  return arr.reduce(function (res, val, i, arr) {\n    return res.push(fn(res.slice(-1)[0], val, i, arr)), res;\n  }, [acc]);\n};",
           "example": "reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0); // [0, 1, 3, 6, 10, 15, 21]"
         },
         "tags": [
@@ -5337,7 +5337,7 @@
         "text": "Returns the minimum/maximum value of an array, after applying the provided function to set comparing rule.\r\n\r\nUse `Array.prototype.reduce()` in combination with the `comparator` function to get the appropriate element in the array.\r\nYou can omit the second parameter, `comparator`, to use the default one that returns the minimum element in the array.",
         "codeBlocks": {
           "es6": "const reduceWhich = (arr, comparator = (a, b) => a - b) =>\r\n  arr.reduce((a, b) => (comparator(a, b) >= 0 ? b : a));",
-          "es5": "\"use strict\";\n\nvar reduceWhich = function reduceWhich(arr) {\n  var comparator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : function (a, b) {\n    return a - b;\n  };\n  return arr.reduce(function (a, b) {\n    return comparator(a, b) >= 0 ? b : a;\n  });\n};",
+          "es5": "var reduceWhich = function reduceWhich(arr) {\n  var comparator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : function (a, b) {\n    return a - b;\n  };\n  return arr.reduce(function (a, b) {\n    return comparator(a, b) >= 0 ? b : a;\n  });\n};",
           "example": "reduceWhich([1, 3, 2]); // 1\r\nreduceWhich([1, 3, 2], (a, b) => b - a); // 3\r\nreduceWhich(\r\n  [{ name: 'Tom', age: 12 }, { name: 'Jack', age: 18 }, { name: 'Lucy', age: 9 }],\r\n  (a, b) => a.age - b.age\r\n); // {name: \"Lucy\", age: 9}"
         },
         "tags": [
@@ -5359,7 +5359,7 @@
         "text": "Takes a predicate and array, like `Array.prototype.filter()`, but only keeps `x` if `pred(x) === false`.",
         "codeBlocks": {
           "es6": "const reject = (pred, array) => array.filter((...args) => !pred(...args));",
-          "es5": "\"use strict\";\n\nvar reject = function reject(pred, array) {\n  return array.filter(function () {\n    return !pred.apply(void 0, arguments);\n  });\n};",
+          "es5": "var reject = function reject(pred, array) {\n  return array.filter(function () {\n    return !pred.apply(void 0, arguments);\n  });\n};",
           "example": "reject(x => x % 2 === 0, [1, 2, 3, 4, 5]); // [1, 3, 5]\r\nreject(word => word.length > 4, ['Apple', 'Pear', 'Kiwi', 'Banana']); // ['Pear', 'Kiwi']"
         },
         "tags": [
@@ -5379,8 +5379,8 @@
         "fileName": "remove.md",
         "text": "Removes elements from an array for which the given function returns `false`.\r\n\r\nUse `Array.prototype.filter()` to find array elements that return truthy values and `Array.prototype.reduce()` to remove elements using `Array.prototype.splice()`.\r\nThe `func` is invoked with three arguments (`value, index, array`).",
         "codeBlocks": {
-          "es6": "const remove = (arr, func) =>\r\n  Array.isArray(arr)\r\n    ? arr.filter(func).reduce((acc, val) => {\r\n        arr.splice(arr.indexOf(val), 1);\r\n        return acc.concat(val);\r\n      }, [])\r\n    : [];",
-          "es5": "\"use strict\";\n\nvar remove = function remove(arr, func) {\n  return Array.isArray(arr) ? arr.filter(func).reduce(function (acc, val) {\n    arr.splice(arr.indexOf(val), 1);\n    return acc.concat(val);\n  }, []) : [];\n};",
+          "es6": "const remove = (arr, func) =>\r\n  Array.isArray(arr)\r\n    ? arr.filter(func).reduce((acc, val) => {\r\n      arr.splice(arr.indexOf(val), 1);\r\n      return acc.concat(val);\r\n    }, [])\r\n    : [];",
+          "es5": "var remove = function remove(arr, func) {\n  return Array.isArray(arr) ? arr.filter(func).reduce(function (acc, val) {\n    arr.splice(arr.indexOf(val), 1);\n    return acc.concat(val);\n  }, []) : [];\n};",
           "example": "remove([1, 2, 3, 4], n => n % 2 === 0); // [2, 4]"
         },
         "tags": [
@@ -5390,7 +5390,7 @@
       },
       "meta": {
         "archived": false,
-        "hash": "5aac190c69a2a7d42dd4f17caabe760270ac8c82b8b54b760d3d6b1de86362d7"
+        "hash": "7a8643d6d71023c773ccb63efe25e4c9fe0bdd976a8a8f76f6f6a0abb928eaf1"
       }
     },
     {
@@ -5401,7 +5401,7 @@
         "text": "Removes non-printable ASCII characters.\r\n\r\nUse a regular expression to remove non-printable ASCII characters.",
         "codeBlocks": {
           "es6": "const removeNonASCII = str => str.replace(/[^\\x20-\\x7E]/g, '');",
-          "es5": "\"use strict\";\n\nvar removeNonASCII = function removeNonASCII(str) {\n  return str.replace(/[^\\x20-\\x7E]/g, '');\n};",
+          "es5": "var removeNonASCII = function removeNonASCII(str) {\n  return str.replace(/[^\\x20-\\x7E]/g, '');\n};",
           "example": "removeNonASCII('äÄçÇéÉêlorem-ipsumöÖÐþúÚ'); // 'lorem-ipsum'"
         },
         "tags": [
@@ -5423,7 +5423,7 @@
         "text": "Replaces the names of multiple object keys with the values provided.\r\n\r\nUse `Object.keys()` in combination with `Array.prototype.reduce()` and the spread operator (`...`) to get the object's keys and rename them according to `keysMap`.",
         "codeBlocks": {
           "es6": "const renameKeys = (keysMap, obj) =>\r\n  Object.keys(obj).reduce(\r\n    (acc, key) => ({\r\n      ...acc,\r\n      ...{ [keysMap[key] || key]: obj[key] }\r\n    }),\r\n    {}\r\n  );",
-          "es5": "\"use strict\";\n\nfunction _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar renameKeys = function renameKeys(keysMap, obj) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    return _objectSpread({}, acc, _defineProperty({}, keysMap[key] || key, obj[key]));\n  }, {});\n};",
+          "es5": "function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\nvar renameKeys = function renameKeys(keysMap, obj) {\n  return Object.keys(obj).reduce(function (acc, key) {\n    return _objectSpread({}, acc, _defineProperty({}, keysMap[key] || key, obj[key]));\n  }, {});\n};",
           "example": "const obj = { name: 'Bobo', job: 'Front-End Master', shoeSize: 100 };\r\nrenameKeys({ name: 'firstName', job: 'passion' }, obj); // { firstName: 'Bobo', passion: 'Front-End Master', shoeSize: 100 }"
         },
         "tags": [
@@ -5444,7 +5444,7 @@
         "text": "Reverses a string.\r\n\r\nUse the spread operator (`...`) and `Array.prototype.reverse()` to reverse the order of the characters in the string.\r\nCombine characters to get a string using `String.prototype.join('')`.",
         "codeBlocks": {
           "es6": "const reverseString = str => [...str].reverse().join('');",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar reverseString = function reverseString(str) {\n  return _toConsumableArray(str).reverse().join('');\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar reverseString = function reverseString(str) {\n  return _toConsumableArray(str).reverse().join('');\n};",
           "example": "reverseString('foobar'); // 'raboof'"
         },
         "tags": [
@@ -5466,7 +5466,7 @@
         "text": "Converts the values of RGB components to a color code.\r\n\r\nConvert given RGB parameters to hexadecimal string using bitwise left-shift operator (`<<`) and `toString(16)`, then `String.padStart(6,'0')` to get a 6-digit hexadecimal value.",
         "codeBlocks": {
           "es6": "const RGBToHex = (r, g, b) => ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');",
-          "es5": "\"use strict\";\n\nvar RGBToHex = function RGBToHex(r, g, b) {\n  return ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');\n};",
+          "es5": "var RGBToHex = function RGBToHex(r, g, b) {\n  return ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');\n};",
           "example": "RGBToHex(255, 165, 1); // 'ffa501'"
         },
         "tags": [
@@ -5487,7 +5487,7 @@
         "text": "Rounds a number to a specified amount of digits.\r\n\r\nUse `Math.round()` and template literals to round the number to the specified number of digits.\r\nOmit the second argument, `decimals` to round to an integer.",
         "codeBlocks": {
           "es6": "const round = (n, decimals = 0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);",
-          "es5": "\"use strict\";\n\nvar round = function round(n) {\n  var decimals = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return Number(\"\".concat(Math.round(\"\".concat(n, \"e\").concat(decimals)), \"e-\").concat(decimals));\n};",
+          "es5": "var round = function round(n) {\n  var decimals = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  return Number(\"\".concat(Math.round(\"\".concat(n, \"e\").concat(decimals)), \"e-\").concat(decimals));\n};",
           "example": "round(1.005, 2); // 1.01"
         },
         "tags": [
@@ -5508,7 +5508,7 @@
         "text": "Runs a function in a separate thread by using a [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers), allowing long running functions to not block the UI.\r\n\r\nCreate a new `Worker` using a `Blob` object URL, the contents of which should be the stringified version of the supplied function.\r\nImmediately post the return value of calling the function back.\r\nReturn a promise, listening for `onmessage` and `onerror` events and resolving the data posted back from the worker, or throwing an error.",
         "codeBlocks": {
           "es6": "const runAsync = fn => {\r\n  const worker = new Worker(\r\n    URL.createObjectURL(new Blob([`postMessage((${fn})());`]), {\r\n      type: 'application/javascript; charset=utf-8'\r\n    })\r\n  );\r\n  return new Promise((res, rej) => {\r\n    worker.onmessage = ({ data }) => {\r\n      res(data), worker.terminate();\r\n    };\r\n    worker.onerror = err => {\r\n      rej(err), worker.terminate();\r\n    };\r\n  });\r\n};",
-          "es5": "\"use strict\";\n\nvar runAsync = function runAsync(fn) {\n  var worker = new Worker(URL.createObjectURL(new Blob([\"postMessage((\".concat(fn, \")());\")]), {\n    type: 'application/javascript; charset=utf-8'\n  }));\n  return new Promise(function (res, rej) {\n    worker.onmessage = function (_ref) {\n      var data = _ref.data;\n      res(data), worker.terminate();\n    };\n\n    worker.onerror = function (err) {\n      rej(err), worker.terminate();\n    };\n  });\n};",
+          "es5": "var runAsync = function runAsync(fn) {\n  var worker = new Worker(URL.createObjectURL(new Blob([\"postMessage((\".concat(fn, \")());\")]), {\n    type: 'application/javascript; charset=utf-8'\n  }));\n  return new Promise(function (res, rej) {\n    worker.onmessage = function (_ref) {\n      var data = _ref.data;\n      res(data), worker.terminate();\n    };\n\n    worker.onerror = function (err) {\n      rej(err), worker.terminate();\n    };\n  });\n};",
           "example": "const longRunningFunction = () => {\r\n  let result = 0;\r\n  for (let i = 0; i < 1000; i++)\r\n    for (let j = 0; j < 700; j++) for (let k = 0; k < 300; k++) result = result + i + j + k;\r\n\r\n  return result;\r\n};\r\n/*\r\n  NOTE: Since the function is running in a different context, closures are not supported.\r\n  The function supplied to `runAsync` gets stringified, so everything becomes literal.\r\n  All variables and functions must be defined inside.\r\n*/\r\nrunAsync(longRunningFunction).then(console.log); // 209685000000\r\nrunAsync(() => 10 ** 3).then(console.log); // 1000\r\nlet outsideVariable = 50;\r\nrunAsync(() => typeof outsideVariable).then(console.log); // 'undefined'"
         },
         "tags": [
@@ -5532,7 +5532,7 @@
         "text": "Runs an array of promises in series.\r\n\r\nUse `Array.prototype.reduce()` to create a promise chain, where each promise returns the next promise when resolved.",
         "codeBlocks": {
           "es6": "const runPromisesInSeries = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());",
-          "es5": "\"use strict\";\n\nvar runPromisesInSeries = function runPromisesInSeries(ps) {\n  return ps.reduce(function (p, next) {\n    return p.then(next);\n  }, Promise.resolve());\n};",
+          "es5": "var runPromisesInSeries = function runPromisesInSeries(ps) {\n  return ps.reduce(function (p, next) {\n    return p.then(next);\n  }, Promise.resolve());\n};",
           "example": "const delay = d => new Promise(r => setTimeout(r, d));\r\nrunPromisesInSeries([() => delay(1000), () => delay(2000)]); // Executes each promise sequentially, taking a total of 3 seconds to complete"
         },
         "tags": [
@@ -5554,7 +5554,7 @@
         "text": "Returns a random element from an array.\r\n\r\nUse `Math.random()` to generate a random number, multiply it by `length` and round it off to the nearest whole number using `Math.floor()`.\r\nThis method also works with strings.",
         "codeBlocks": {
           "es6": "const sample = arr => arr[Math.floor(Math.random() * arr.length)];",
-          "es5": "\"use strict\";\n\nvar sample = function sample(arr) {\n  return arr[Math.floor(Math.random() * arr.length)];\n};",
+          "es5": "var sample = function sample(arr) {\n  return arr[Math.floor(Math.random() * arr.length)];\n};",
           "example": "sample([3, 7, 9, 11]); // 9"
         },
         "tags": [
@@ -5576,7 +5576,7 @@
         "text": "Gets `n` random elements at unique keys from `array` up to the size of `array`.\r\n\r\nShuffle the array using the [Fisher-Yates algorithm](https://github.com/30-seconds/30-seconds-of-code#shuffle).\r\nUse `Array.prototype.slice()` to get the first `n` elements.\r\nOmit the second argument, `n` to get only one element at random from the array.",
         "codeBlocks": {
           "es6": "const sampleSize = ([...arr], n = 1) => {\r\n  let m = arr.length;\r\n  while (m) {\r\n    const i = Math.floor(Math.random() * m--);\r\n    [arr[m], arr[i]] = [arr[i], arr[m]];\r\n  }\r\n  return arr.slice(0, n);\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar sampleSize = function sampleSize(_ref) {\n  var _ref2 = _toArray(_ref),\n      arr = _ref2.slice(0);\n\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  var m = arr.length;\n\n  while (m) {\n    var i = Math.floor(Math.random() * m--);\n    var _ref3 = [arr[i], arr[m]];\n    arr[m] = _ref3[0];\n    arr[i] = _ref3[1];\n  }\n\n  return arr.slice(0, n);\n};",
+          "es5": "function _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar sampleSize = function sampleSize(_ref) {\n  var _ref2 = _toArray(_ref),\n      arr = _ref2.slice(0);\n\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  var m = arr.length;\n\n  while (m) {\n    var i = Math.floor(Math.random() * m--);\n    var _ref3 = [arr[i], arr[m]];\n    arr[m] = _ref3[0];\n    arr[i] = _ref3[1];\n  }\n\n  return arr.slice(0, n);\n};",
           "example": "sampleSize([1, 2, 3], 2); // [3,1]\r\nsampleSize([1, 2, 3], 4); // [2,3,1]"
         },
         "tags": [
@@ -5598,7 +5598,7 @@
         "text": "Smooth-scrolls to the top of the page.\r\n\r\nGet distance from top using `document.documentElement.scrollTop` or `document.body.scrollTop`.\r\nScroll by a fraction of the distance from the top. Use `window.requestAnimationFrame()` to animate the scrolling.",
         "codeBlocks": {
           "es6": "const scrollToTop = () => {\r\n  const c = document.documentElement.scrollTop || document.body.scrollTop;\r\n  if (c > 0) {\r\n    window.requestAnimationFrame(scrollToTop);\r\n    window.scrollTo(0, c - c / 8);\r\n  }\r\n};",
-          "es5": "\"use strict\";\n\nvar scrollToTop = function scrollToTop() {\n  var c = document.documentElement.scrollTop || document.body.scrollTop;\n\n  if (c > 0) {\n    window.requestAnimationFrame(scrollToTop);\n    window.scrollTo(0, c - c / 8);\n  }\n};",
+          "es5": "var scrollToTop = function scrollToTop() {\n  var c = document.documentElement.scrollTop || document.body.scrollTop;\n\n  if (c > 0) {\n    window.requestAnimationFrame(scrollToTop);\n    window.scrollTo(0, c - c / 8);\n  }\n};",
           "example": "scrollToTop();"
         },
         "tags": [
@@ -5619,7 +5619,7 @@
         "text": "Hashes the input string into a whole number.\r\n\r\nUse `String.prototype.split('')` and `Array.prototype.reduce()` to create a hash of the input string, utilizing bit shifting.",
         "codeBlocks": {
           "es6": "const sdbm = str => {\r\n  let arr = str.split('');\r\n  return arr.reduce(\r\n    (hashCode, currentVal) =>\r\n      (hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode),\r\n    0\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nvar sdbm = function sdbm(str) {\n  var arr = str.split('');\n  return arr.reduce(function (hashCode, currentVal) {\n    return hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode;\n  }, 0);\n};",
+          "es5": "var sdbm = function sdbm(str) {\n  var arr = str.split('');\n  return arr.reduce(function (hashCode, currentVal) {\n    return hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode;\n  }, 0);\n};",
           "example": "sdbm('name'); // -3521204949"
         },
         "tags": [
@@ -5641,7 +5641,7 @@
         "text": "Serialize a cookie name-value pair into a Set-Cookie header string.\r\n\r\nUse template literals and `encodeURIComponent()` to create the appropriate string.",
         "codeBlocks": {
           "es6": "const serializeCookie = (name, val) => `${encodeURIComponent(name)}=${encodeURIComponent(val)}`;",
-          "es5": "\"use strict\";\n\nvar serializeCookie = function serializeCookie(name, val) {\n  return \"\".concat(encodeURIComponent(name), \"=\").concat(encodeURIComponent(val));\n};",
+          "es5": "var serializeCookie = function serializeCookie(name, val) {\n  return \"\".concat(encodeURIComponent(name), \"=\").concat(encodeURIComponent(val));\n};",
           "example": "serializeCookie('foo', 'bar'); // 'foo=bar'"
         },
         "tags": [
@@ -5663,7 +5663,7 @@
         "text": "Sets the value of a CSS rule for the specified element.\r\n\r\nUse `element.style` to set the value of the CSS rule for the specified element to `val`.",
         "codeBlocks": {
           "es6": "const setStyle = (el, ruleName, val) => (el.style[ruleName] = val);",
-          "es5": "\"use strict\";\n\nvar setStyle = function setStyle(el, ruleName, val) {\n  return el.style[ruleName] = val;\n};",
+          "es5": "var setStyle = function setStyle(el, ruleName, val) {\n  return el.style[ruleName] = val;\n};",
           "example": "setStyle(document.querySelector('p'), 'font-size', '20px'); // The first <p> element on the page will have a font-size of 20px"
         },
         "tags": [
@@ -5684,7 +5684,7 @@
         "text": "Creates a shallow clone of an object.\r\n\r\nUse `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.",
         "codeBlocks": {
           "es6": "const shallowClone = obj => Object.assign({}, obj);",
-          "es5": "\"use strict\";\n\nvar shallowClone = function shallowClone(obj) {\n  return Object.assign({}, obj);\n};",
+          "es5": "var shallowClone = function shallowClone(obj) {\n  return Object.assign({}, obj);\n};",
           "example": "const a = { x: true, y: 1 };\r\nconst b = shallowClone(a); // a !== b"
         },
         "tags": [
@@ -5705,7 +5705,7 @@
         "text": "Has the same functionality as [`Array.prototype.prototype.splice()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice), but returning a new array instead of mutating the original array.\r\n\r\nUse `Array.prototype.slice()` and `Array.prototype.concat()` to get a new array with the new contents after removing existing elements and/or adding new elements.\r\nOmit the second argument, `index`, to start at `0`.\r\nOmit the third argument, `delCount`, to remove `0` elements.\r\nOmit the fourth argument, `elements`, in order to not add any new elements.",
         "codeBlocks": {
           "es6": "const shank = (arr, index = 0, delCount = 0, ...elements) =>\r\n  arr\r\n    .slice(0, index)\r\n    .concat(elements)\r\n    .concat(arr.slice(index + delCount));",
-          "es5": "\"use strict\";\n\nvar shank = function shank(arr) {\n  var index = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var delCount = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;\n\n  for (var _len = arguments.length, elements = new Array(_len > 3 ? _len - 3 : 0), _key = 3; _key < _len; _key++) {\n    elements[_key - 3] = arguments[_key];\n  }\n\n  return arr.slice(0, index).concat(elements).concat(arr.slice(index + delCount));\n};",
+          "es5": "var shank = function shank(arr) {\n  var index = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;\n  var delCount = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;\n\n  for (var _len = arguments.length, elements = new Array(_len > 3 ? _len - 3 : 0), _key = 3; _key < _len; _key++) {\n    elements[_key - 3] = arguments[_key];\n  }\n\n  return arr.slice(0, index).concat(elements).concat(arr.slice(index + delCount));\n};",
           "example": "const names = ['alpha', 'bravo', 'charlie'];\r\nconst namesAndDelta = shank(names, 1, 0, 'delta'); // [ 'alpha', 'delta', 'bravo', 'charlie' ]\r\nconst namesNoBravo = shank(names, 1, 1); // [ 'alpha', 'charlie' ]\r\nconsole.log(names); // ['alpha', 'bravo', 'charlie']"
         },
         "tags": [
@@ -5726,7 +5726,7 @@
         "text": "Shows all the elements specified.\r\n\r\nUse the spread operator (`...`) and `Array.prototype.forEach()` to clear the `display` property for each element specified.",
         "codeBlocks": {
           "es6": "const show = (...el) => [...el].forEach(e => (e.style.display = ''));",
-          "es5": "\"use strict\";\n\nvar show = function show() {\n  for (var _len = arguments.length, el = new Array(_len), _key = 0; _key < _len; _key++) {\n    el[_key] = arguments[_key];\n  }\n\n  return el.concat().forEach(function (e) {\n    return e.style.display = '';\n  });\n};",
+          "es5": "var show = function show() {\n  for (var _len = arguments.length, el = new Array(_len), _key = 0; _key < _len; _key++) {\n    el[_key] = arguments[_key];\n  }\n\n  return el.concat().forEach(function (e) {\n    return e.style.display = '';\n  });\n};",
           "example": "show(...document.querySelectorAll('img')); // Shows all <img> elements on the page"
         },
         "tags": [
@@ -5748,7 +5748,7 @@
         "text": "Randomizes the order of the values of an array, returning a new array.\r\n\r\nUses the [Fisher-Yates algorithm](https://github.com/30-seconds/30-seconds-of-code#shuffle) to reorder the elements of the array.",
         "codeBlocks": {
           "es6": "const shuffle = ([...arr]) => {\r\n  let m = arr.length;\r\n  while (m) {\r\n    const i = Math.floor(Math.random() * m--);\r\n    [arr[m], arr[i]] = [arr[i], arr[m]];\r\n  }\r\n  return arr;\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar shuffle = function shuffle(_ref) {\n  var _ref2 = _toArray(_ref),\n      arr = _ref2.slice(0);\n\n  var m = arr.length;\n\n  while (m) {\n    var i = Math.floor(Math.random() * m--);\n    var _ref3 = [arr[i], arr[m]];\n    arr[m] = _ref3[0];\n    arr[i] = _ref3[1];\n  }\n\n  return arr;\n};",
+          "es5": "function _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar shuffle = function shuffle(_ref) {\n  var _ref2 = _toArray(_ref),\n      arr = _ref2.slice(0);\n\n  var m = arr.length;\n\n  while (m) {\n    var i = Math.floor(Math.random() * m--);\n    var _ref3 = [arr[i], arr[m]];\n    arr[m] = _ref3[0];\n    arr[i] = _ref3[1];\n  }\n\n  return arr;\n};",
           "example": "const foo = [1, 2, 3];\r\nshuffle(foo); // [2, 3, 1], foo = [1, 2, 3]"
         },
         "tags": [
@@ -5770,7 +5770,7 @@
         "text": "Returns an array of elements that appear in both arrays.\r\n\r\nUse `Array.prototype.filter()` to remove values that are not part of `values`, determined using `Array.prototype.includes()`.",
         "codeBlocks": {
           "es6": "const similarity = (arr, values) => arr.filter(v => values.includes(v));",
-          "es5": "\"use strict\";\n\nvar similarity = function similarity(arr, values) {\n  return arr.filter(function (v) {\n    return values.includes(v);\n  });\n};",
+          "es5": "var similarity = function similarity(arr, values) {\n  return arr.filter(function (v) {\n    return values.includes(v);\n  });\n};",
           "example": "similarity([1, 2, 3], [1, 2, 4]); // [1, 2]"
         },
         "tags": [
@@ -5792,7 +5792,7 @@
         "text": "Get size of arrays, objects or strings.\r\n\r\nGet type of `val` (`array`, `object` or `string`). \r\nUse `length` property for arrays.\r\nUse `length` or `size` value if available or number of keys for objects.\r\nUse `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API/Blob) created from `val` for strings.\r\n\r\nSplit strings into array of characters with `split('')` and return its length.",
         "codeBlocks": {
           "es6": "const size = val =>\r\n  Array.isArray(val)\r\n    ? val.length\r\n    : val && typeof val === 'object'\r\n      ? val.size || val.length || Object.keys(val).length\r\n      : typeof val === 'string'\r\n        ? new Blob([val]).size\r\n        : 0;",
-          "es5": "\"use strict\";\n\nfunction _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar size = function size(val) {\n  return Array.isArray(val) ? val.length : val && _typeof(val) === 'object' ? val.size || val.length || Object.keys(val).length : typeof val === 'string' ? new Blob([val]).size : 0;\n};",
+          "es5": "function _typeof(obj) { if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; }; } return _typeof(obj); }\n\nvar size = function size(val) {\n  return Array.isArray(val) ? val.length : val && _typeof(val) === 'object' ? val.size || val.length || Object.keys(val).length : typeof val === 'string' ? new Blob([val]).size : 0;\n};",
           "example": "size([1, 2, 3, 4, 5]); // 5\r\nsize('size'); // 4\r\nsize({ one: 1, two: 2, three: 3 }); // 3"
         },
         "tags": [
@@ -5815,7 +5815,7 @@
         "text": "Delays the execution of an asynchronous function.\r\n\r\nDelay executing part of an `async` function, by putting it to sleep, returning a `Promise`.",
         "codeBlocks": {
           "es6": "const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));",
-          "es5": "\"use strict\";\n\nvar sleep = function sleep(ms) {\n  return new Promise(function (resolve) {\n    return setTimeout(resolve, ms);\n  });\n};",
+          "es5": "var sleep = function sleep(ms) {\n  return new Promise(function (resolve) {\n    return setTimeout(resolve, ms);\n  });\n};",
           "example": "async function sleepyWork() {\r\n  console.log(\"I'm going to sleep for 1 second.\");\r\n  await sleep(1000);\r\n  console.log('I woke up after 1 second.');\r\n}"
         },
         "tags": [
@@ -5837,7 +5837,7 @@
         "text": "Smoothly scrolls the element on which it's called into the visible area of the browser window.\r\n\r\nUse `.scrollIntoView` method to scroll the element. \r\nPass `{ behavior: 'smooth' }` to `.scrollIntoView` so it scrolls smoothly.",
         "codeBlocks": {
           "es6": "const smoothScroll = element =>\r\n  document.querySelector(element).scrollIntoView({\r\n    behavior: 'smooth'\r\n  });",
-          "es5": "\"use strict\";\n\nvar smoothScroll = function smoothScroll(element) {\n  return document.querySelector(element).scrollIntoView({\n    behavior: 'smooth'\n  });\n};",
+          "es5": "var smoothScroll = function smoothScroll(element) {\n  return document.querySelector(element).scrollIntoView({\n    behavior: 'smooth'\n  });\n};",
           "example": "smoothScroll('#fooBar'); // scrolls smoothly to the element with the id fooBar\r\nsmoothScroll('.fooBar'); // scrolls smoothly to the first element with a class of fooBar"
         },
         "tags": [
@@ -5859,7 +5859,7 @@
         "text": "Alphabetically sorts the characters in a string.\r\n\r\nUse the spread operator (`...`), `Array.prototype.sort()` and  `String.localeCompare()` to sort the characters in `str`, recombine using `String.prototype.join('')`.",
         "codeBlocks": {
           "es6": "const sortCharactersInString = str => [...str].sort((a, b) => a.localeCompare(b)).join('');",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar sortCharactersInString = function sortCharactersInString(str) {\n  return _toConsumableArray(str).sort(function (a, b) {\n    return a.localeCompare(b);\n  }).join('');\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar sortCharactersInString = function sortCharactersInString(str) {\n  return _toConsumableArray(str).sort(function (a, b) {\n    return a.localeCompare(b);\n  }).join('');\n};",
           "example": "sortCharactersInString('cabbage'); // 'aabbceg'"
         },
         "tags": [
@@ -5880,7 +5880,7 @@
         "text": "Returns the lowest index at which value should be inserted into array in order to maintain its sort order.\r\n\r\nCheck if the array is sorted in descending order (loosely).\r\nUse `Array.prototype.findIndex()` to find the appropriate index where the element should be inserted.",
         "codeBlocks": {
           "es6": "const sortedIndex = (arr, n) => {\r\n  const isDescending = arr[0] > arr[arr.length - 1];\r\n  const index = arr.findIndex(el => (isDescending ? n >= el : n <= el));\r\n  return index === -1 ? arr.length : index;\r\n};",
-          "es5": "\"use strict\";\n\nvar sortedIndex = function sortedIndex(arr, n) {\n  var isDescending = arr[0] > arr[arr.length - 1];\n  var index = arr.findIndex(function (el) {\n    return isDescending ? n >= el : n <= el;\n  });\n  return index === -1 ? arr.length : index;\n};",
+          "es5": "var sortedIndex = function sortedIndex(arr, n) {\n  var isDescending = arr[0] > arr[arr.length - 1];\n  var index = arr.findIndex(function (el) {\n    return isDescending ? n >= el : n <= el;\n  });\n  return index === -1 ? arr.length : index;\n};",
           "example": "sortedIndex([5, 3, 2, 1], 4); // 1\r\nsortedIndex([30, 50], 40); // 1"
         },
         "tags": [
@@ -5902,7 +5902,7 @@
         "text": "Returns the lowest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.\r\n\r\nCheck if the array is sorted in descending order (loosely).\r\nUse `Array.prototype.findIndex()` to find the appropriate index where the element should be inserted, based on the iterator function `fn`.",
         "codeBlocks": {
           "es6": "const sortedIndexBy = (arr, n, fn) => {\r\n  const isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\r\n  const val = fn(n);\r\n  const index = arr.findIndex(el => (isDescending ? val >= fn(el) : val <= fn(el)));\r\n  return index === -1 ? arr.length : index;\r\n};",
-          "es5": "\"use strict\";\n\nvar sortedIndexBy = function sortedIndexBy(arr, n, fn) {\n  var isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\n  var val = fn(n);\n  var index = arr.findIndex(function (el) {\n    return isDescending ? val >= fn(el) : val <= fn(el);\n  });\n  return index === -1 ? arr.length : index;\n};",
+          "es5": "var sortedIndexBy = function sortedIndexBy(arr, n, fn) {\n  var isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\n  var val = fn(n);\n  var index = arr.findIndex(function (el) {\n    return isDescending ? val >= fn(el) : val <= fn(el);\n  });\n  return index === -1 ? arr.length : index;\n};",
           "example": "sortedIndexBy([{ x: 4 }, { x: 5 }], { x: 4 }, o => o.x); // 0"
         },
         "tags": [
@@ -5925,7 +5925,7 @@
         "text": "Returns the highest index at which value should be inserted into array in order to maintain its sort order.\r\n\r\nCheck if the array is sorted in descending order (loosely).\r\nUse `Array.prototype.reverse()` and `Array.prototype.findIndex()` to find the appropriate last index where the element should be inserted.",
         "codeBlocks": {
           "es6": "const sortedLastIndex = (arr, n) => {\r\n  const isDescending = arr[0] > arr[arr.length - 1];\r\n  const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el));\r\n  return index === -1 ? 0 : arr.length - index;\r\n};",
-          "es5": "\"use strict\";\n\nvar sortedLastIndex = function sortedLastIndex(arr, n) {\n  var isDescending = arr[0] > arr[arr.length - 1];\n  var index = arr.reverse().findIndex(function (el) {\n    return isDescending ? n <= el : n >= el;\n  });\n  return index === -1 ? 0 : arr.length - index;\n};",
+          "es5": "var sortedLastIndex = function sortedLastIndex(arr, n) {\n  var isDescending = arr[0] > arr[arr.length - 1];\n  var index = arr.reverse().findIndex(function (el) {\n    return isDescending ? n <= el : n >= el;\n  });\n  return index === -1 ? 0 : arr.length - index;\n};",
           "example": "sortedLastIndex([10, 20, 30, 30, 40], 30); // 4"
         },
         "tags": [
@@ -5947,7 +5947,7 @@
         "text": "Returns the highest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function.\r\n\r\nCheck if the array is sorted in descending order (loosely).\r\nUse `Array.prototype.map()` to apply the iterator function to all elements of the array.\r\nUse `Array.prototype.reverse()` and `Array.prototype.findIndex()` to find the appropriate last index where the element should be inserted, based on the provided iterator function.",
         "codeBlocks": {
           "es6": "const sortedLastIndexBy = (arr, n, fn) => {\r\n  const isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\r\n  const val = fn(n);\r\n  const index = arr\r\n    .map(fn)\r\n    .reverse()\r\n    .findIndex(el => (isDescending ? val <= el : val >= el));\r\n  return index === -1 ? 0 : arr.length - index;\r\n};",
-          "es5": "\"use strict\";\n\nvar sortedLastIndexBy = function sortedLastIndexBy(arr, n, fn) {\n  var isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\n  var val = fn(n);\n  var index = arr.map(fn).reverse().findIndex(function (el) {\n    return isDescending ? val <= el : val >= el;\n  });\n  return index === -1 ? 0 : arr.length - index;\n};",
+          "es5": "var sortedLastIndexBy = function sortedLastIndexBy(arr, n, fn) {\n  var isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);\n  var val = fn(n);\n  var index = arr.map(fn).reverse().findIndex(function (el) {\n    return isDescending ? val <= el : val >= el;\n  });\n  return index === -1 ? 0 : arr.length - index;\n};",
           "example": "sortedLastIndexBy([{ x: 4 }, { x: 5 }], { x: 4 }, o => o.x); // 1"
         },
         "tags": [
@@ -5970,7 +5970,7 @@
         "text": "Splits a multiline string into an array of lines.\r\n\r\nUse `String.prototype.split()` and a regular expression to match line breaks and create an array.",
         "codeBlocks": {
           "es6": "const splitLines = str => str.split(/\\r?\\n/);",
-          "es5": "\"use strict\";\n\nvar splitLines = function splitLines(str) {\n  return str.split(/\\r?\\n/);\n};",
+          "es5": "var splitLines = function splitLines(str) {\n  return str.split(/\\r?\\n/);\n};",
           "example": "splitLines('This\\nis a\\nmultiline\\nstring.\\n'); // ['This', 'is a', 'multiline', 'string.' , '']"
         },
         "tags": [
@@ -5991,7 +5991,7 @@
         "text": "Takes a variadic function and returns a closure that accepts an array of arguments to map to the inputs of the function.\r\n\r\nUse closures and the spread operator (`...`) to map the array of arguments to the inputs of the function.",
         "codeBlocks": {
           "es6": "const spreadOver = fn => argsArr => fn(...argsArr);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar spreadOver = function spreadOver(fn) {\n  return function (argsArr) {\n    return fn.apply(void 0, _toConsumableArray(argsArr));\n  };\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar spreadOver = function spreadOver(fn) {\n  return function (argsArr) {\n    return fn.apply(void 0, _toConsumableArray(argsArr));\n  };\n};",
           "example": "const arrayMax = spreadOver(Math.max);\narrayMax([1, 2, 3]); // 3"
         },
         "tags": [
@@ -6012,7 +6012,7 @@
         "text": "Performs stable sorting of an array, preserving the initial indexes of items when their values are the same.\r\nDoes not mutate the original array, but returns a new array instead.\r\n\r\nUse `Array.prototype.map()` to pair each element of the input array with its corresponding index.\r\nUse `Array.prototype.sort()` and a `compare` function to sort the list, preserving their initial order if the items compared are equal.\r\nUse `Array.prototype.map()` to convert back to the initial array items.",
         "codeBlocks": {
           "es6": "const stableSort = (arr, compare) =>\r\n  arr\r\n    .map((item, index) => ({ item, index }))\r\n    .sort((a, b) => compare(a.item, b.item) || a.index - b.index)\r\n    .map(({ item }) => item);",
-          "es5": "\"use strict\";\n\nvar stableSort = function stableSort(arr, compare) {\n  return arr.map(function (item, index) {\n    return {\n      item: item,\n      index: index\n    };\n  }).sort(function (a, b) {\n    return compare(a.item, b.item) || a.index - b.index;\n  }).map(function (_ref) {\n    var item = _ref.item;\n    return item;\n  });\n};",
+          "es5": "var stableSort = function stableSort(arr, compare) {\n  return arr.map(function (item, index) {\n    return {\n      item: item,\n      index: index\n    };\n  }).sort(function (a, b) {\n    return compare(a.item, b.item) || a.index - b.index;\n  }).map(function (_ref) {\n    var item = _ref.item;\n    return item;\n  });\n};",
           "example": "const arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];\r\nconst stable = stableSort(arr, () => 0); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]"
         },
         "tags": [
@@ -6035,7 +6035,7 @@
         "text": "Returns the standard deviation of an array of numbers.\r\n\r\nUse `Array.prototype.reduce()` to calculate the mean, variance and the sum of the variance of the values, the variance of the values, then\r\ndetermine the standard deviation.\r\nYou can omit the second argument to get the sample standard deviation or set it to `true` to get the population standard deviation.",
         "codeBlocks": {
           "es6": "const standardDeviation = (arr, usePopulation = false) => {\r\n  const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;\r\n  return Math.sqrt(\r\n    arr.reduce((acc, val) => acc.concat((val - mean) ** 2), []).reduce((acc, val) => acc + val, 0) /\r\n      (arr.length - (usePopulation ? 0 : 1))\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nvar standardDeviation = function standardDeviation(arr) {\n  var usePopulation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  var mean = arr.reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / arr.length;\n  return Math.sqrt(arr.reduce(function (acc, val) {\n    return acc.concat(Math.pow(val - mean, 2));\n  }, []).reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / (arr.length - (usePopulation ? 0 : 1)));\n};",
+          "es5": "var standardDeviation = function standardDeviation(arr) {\n  var usePopulation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  var mean = arr.reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / arr.length;\n  return Math.sqrt(arr.reduce(function (acc, val) {\n    return acc.concat(Math.pow(val - mean, 2));\n  }, []).reduce(function (acc, val) {\n    return acc + val;\n  }, 0) / (arr.length - (usePopulation ? 0 : 1)));\n};",
           "example": "standardDeviation([10, 2, 38, 23, 38, 23, 21]); // 13.284434142114991 (sample)\r\nstandardDeviation([10, 2, 38, 23, 38, 23, 21], true); // 12.29899614287479 (population)"
         },
         "tags": [
@@ -6057,7 +6057,7 @@
         "text": "⚠️ **WARNING**: This function's execution time increases exponentially with each character. Anything more than 8 to 10 characters will cause your browser to hang as it tries to solve all the different combinations.\r\n\r\nGenerates all permutations of a string (contains duplicates).\r\n\r\nUse recursion.\r\nFor each letter in the given string, create all the partial permutations for the rest of its letters.\r\nUse `Array.prototype.map()` to combine the letter with each partial permutation, then `Array.prototype.reduce()` to combine all permutations in one array.\r\nBase cases are for string `length` equal to `2` or `1`.",
         "codeBlocks": {
           "es6": "const stringPermutations = str => {\r\n  if (str.length <= 2) return str.length === 2 ? [str, str[1] + str[0]] : [str];\r\n  return str\r\n    .split('')\r\n    .reduce(\r\n      (acc, letter, i) =>\r\n        acc.concat(stringPermutations(str.slice(0, i) + str.slice(i + 1)).map(val => letter + val)),\r\n      []\r\n    );\r\n};",
-          "es5": "\"use strict\";\n\nvar stringPermutations = function stringPermutations(str) {\n  if (str.length <= 2) return str.length === 2 ? [str, str[1] + str[0]] : [str];\n  return str.split('').reduce(function (acc, letter, i) {\n    return acc.concat(stringPermutations(str.slice(0, i) + str.slice(i + 1)).map(function (val) {\n      return letter + val;\n    }));\n  }, []);\n};",
+          "es5": "var stringPermutations = function stringPermutations(str) {\n  if (str.length <= 2) return str.length === 2 ? [str, str[1] + str[0]] : [str];\n  return str.split('').reduce(function (acc, letter, i) {\n    return acc.concat(stringPermutations(str.slice(0, i) + str.slice(i + 1)).map(function (val) {\n      return letter + val;\n    }));\n  }, []);\n};",
           "example": "stringPermutations('abc'); // ['abc','acb','bac','bca','cab','cba']"
         },
         "tags": [
@@ -6079,7 +6079,7 @@
         "text": "Removes HTML/XML tags from string.\r\n\r\nUse a regular expression to remove HTML/XML tags from a string.",
         "codeBlocks": {
           "es6": "const stripHTMLTags = str => str.replace(/<[^>]*>/g, '');",
-          "es5": "\"use strict\";\n\nvar stripHTMLTags = function stripHTMLTags(str) {\n  return str.replace(/<[^>]*>/g, '');\n};",
+          "es5": "var stripHTMLTags = function stripHTMLTags(str) {\n  return str.replace(/<[^>]*>/g, '');\n};",
           "example": "stripHTMLTags('<p><em>lorem</em> <strong>ipsum</strong></p>'); // 'lorem ipsum'"
         },
         "tags": [
@@ -6102,7 +6102,7 @@
         "text": "Returns the sum of two or more numbers/arrays.\r\n\r\nUse `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`.",
         "codeBlocks": {
           "es6": "const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);",
-          "es5": "\"use strict\";\n\nvar sum = function sum() {\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (acc, val) {\n    return acc + val;\n  }, 0);\n};",
+          "es5": "var sum = function sum() {\n  for (var _len = arguments.length, arr = new Array(_len), _key = 0; _key < _len; _key++) {\n    arr[_key] = arguments[_key];\n  }\n\n  return arr.concat().reduce(function (acc, val) {\n    return acc + val;\n  }, 0);\n};",
           "example": "sum(...[1, 2, 3, 4]); // 10"
         },
         "tags": [
@@ -6124,7 +6124,7 @@
         "text": "Returns the sum of an array, after mapping each element to a value using the provided function.\r\n\r\nUse `Array.prototype.map()` to map each element to the value returned by `fn`, `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0`.",
         "codeBlocks": {
           "es6": "const sumBy = (arr, fn) =>\r\n  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0);",
-          "es5": "\"use strict\";\n\nvar sumBy = function sumBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    return acc + val;\n  }, 0);\n};",
+          "es5": "var sumBy = function sumBy(arr, fn) {\n  return arr.map(typeof fn === 'function' ? fn : function (val) {\n    return val[fn];\n  }).reduce(function (acc, val) {\n    return acc + val;\n  }, 0);\n};",
           "example": "sumBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], o => o.n); // 20\r\nsumBy([{ n: 4 }, { n: 2 }, { n: 8 }, { n: 6 }], 'n'); // 20"
         },
         "tags": [
@@ -6147,7 +6147,7 @@
         "text": "Returns the sum of the powers of all the numbers from `start` to `end` (both inclusive).\r\n\r\nUse `Array.prototype.fill()` to create an array of all the numbers in the target range, `Array.prototype.map()` and the exponent operator (`**`) to raise them to `power` and `Array.prototype.reduce()` to add them together.\r\nOmit the second argument, `power`, to use a default power of `2`.\r\nOmit the third argument, `start`, to use a default starting value of `1`.",
         "codeBlocks": {
           "es6": "const sumPower = (end, power = 2, start = 1) =>\r\n  Array(end + 1 - start)\r\n    .fill(0)\r\n    .map((x, i) => (i + start) ** power)\r\n    .reduce((a, b) => a + b, 0);",
-          "es5": "\"use strict\";\n\nvar sumPower = function sumPower(end) {\n  var power = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 2;\n  var start = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array(end + 1 - start).fill(0).map(function (x, i) {\n    return Math.pow(i + start, power);\n  }).reduce(function (a, b) {\n    return a + b;\n  }, 0);\n};",
+          "es5": "var sumPower = function sumPower(end) {\n  var power = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 2;\n  var start = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 1;\n  return Array(end + 1 - start).fill(0).map(function (x, i) {\n    return Math.pow(i + start, power);\n  }).reduce(function (a, b) {\n    return a + b;\n  }, 0);\n};",
           "example": "sumPower(10); // 385\r\nsumPower(10, 3); // 3025\r\nsumPower(10, 3, 5); // 2925"
         },
         "tags": [
@@ -6168,7 +6168,7 @@
         "text": "Returns the symmetric difference between two arrays, without filtering out duplicate values.\r\n\r\nCreate a `Set` from each array, then use `Array.prototype.filter()` on each of them to only keep values not contained in the other.",
         "codeBlocks": {
           "es6": "const symmetricDifference = (a, b) => {\r\n  const sA = new Set(a),\r\n    sB = new Set(b);\r\n  return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifference = function symmetricDifference(a, b) {\n  var sA = new Set(a),\n      sB = new Set(b);\n  return _toConsumableArray(a.filter(function (x) {\n    return !sB.has(x);\n  })).concat(_toConsumableArray(b.filter(function (x) {\n    return !sA.has(x);\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifference = function symmetricDifference(a, b) {\n  var sA = new Set(a),\n      sB = new Set(b);\n  return _toConsumableArray(a.filter(function (x) {\n    return !sB.has(x);\n  })).concat(_toConsumableArray(b.filter(function (x) {\n    return !sA.has(x);\n  })));\n};",
           "example": "symmetricDifference([1, 2, 3], [1, 2, 4]); // [3, 4]\r\nsymmetricDifference([1, 2, 2], [1, 3, 1]); // [2, 2, 3]"
         },
         "tags": [
@@ -6190,7 +6190,7 @@
         "text": "Returns the symmetric difference between two arrays, after applying the provided function to each array element of both.\r\n\r\nCreate a `Set` by applying `fn` to each array's elements, then use `Array.prototype.filter()` on each of them to only keep values not contained in the other.",
         "codeBlocks": {
           "es6": "const symmetricDifferenceBy = (a, b, fn) => {\r\n  const sA = new Set(a.map(v => fn(v))),\r\n    sB = new Set(b.map(v => fn(v)));\r\n  return [...a.filter(x => !sB.has(fn(x))), ...b.filter(x => !sA.has(fn(x)))];\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifferenceBy = function symmetricDifferenceBy(a, b, fn) {\n  var sA = new Set(a.map(function (v) {\n    return fn(v);\n  })),\n      sB = new Set(b.map(function (v) {\n    return fn(v);\n  }));\n  return _toConsumableArray(a.filter(function (x) {\n    return !sB.has(fn(x));\n  })).concat(_toConsumableArray(b.filter(function (x) {\n    return !sA.has(fn(x));\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifferenceBy = function symmetricDifferenceBy(a, b, fn) {\n  var sA = new Set(a.map(function (v) {\n    return fn(v);\n  })),\n      sB = new Set(b.map(function (v) {\n    return fn(v);\n  }));\n  return _toConsumableArray(a.filter(function (x) {\n    return !sB.has(fn(x));\n  })).concat(_toConsumableArray(b.filter(function (x) {\n    return !sA.has(fn(x));\n  })));\n};",
           "example": "symmetricDifferenceBy([2.1, 1.2], [2.3, 3.4], Math.floor); // [ 1.2, 3.4 ]"
         },
         "tags": [
@@ -6212,7 +6212,7 @@
         "text": "Returns the symmetric difference between two arrays, using a provided function as a comparator.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.findIndex()` to find the appropriate values.",
         "codeBlocks": {
           "es6": "const symmetricDifferenceWith = (arr, val, comp) => [\r\n  ...arr.filter(a => val.findIndex(b => comp(a, b)) === -1),\r\n  ...val.filter(a => arr.findIndex(b => comp(a, b)) === -1)\r\n];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifferenceWith = function symmetricDifferenceWith(arr, val, comp) {\n  return _toConsumableArray(arr.filter(function (a) {\n    return val.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  })).concat(_toConsumableArray(val.filter(function (a) {\n    return arr.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  })));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar symmetricDifferenceWith = function symmetricDifferenceWith(arr, val, comp) {\n  return _toConsumableArray(arr.filter(function (a) {\n    return val.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  })).concat(_toConsumableArray(val.filter(function (a) {\n    return arr.findIndex(function (b) {\n      return comp(a, b);\n    }) === -1;\n  })));\n};",
           "example": "symmetricDifferenceWith(\r\n  [1, 1.2, 1.5, 3, 0],\r\n  [1.9, 3, 0, 3.9],\r\n  (a, b) => Math.round(a) === Math.round(b)\r\n); // [1, 1.2, 3.9]"
         },
         "tags": [
@@ -6234,7 +6234,7 @@
         "text": "Returns all elements in an array except for the first one.\r\n\r\nReturn `Array.prototype.slice(1)` if the array's `length` is more than `1`, otherwise, return the whole array.",
         "codeBlocks": {
           "es6": "const tail = arr => (arr.length > 1 ? arr.slice(1) : arr);",
-          "es5": "\"use strict\";\n\nvar tail = function tail(arr) {\n  return arr.length > 1 ? arr.slice(1) : arr;\n};",
+          "es5": "var tail = function tail(arr) {\n  return arr.length > 1 ? arr.slice(1) : arr;\n};",
           "example": "tail([1, 2, 3]); // [2,3]\r\ntail([1]); // [1]"
         },
         "tags": [
@@ -6255,7 +6255,7 @@
         "text": "Returns an array with n elements removed from the beginning.\r\n\r\nUse `Array.prototype.slice()` to create a slice of the array with `n` elements taken from the beginning.",
         "codeBlocks": {
           "es6": "const take = (arr, n = 1) => arr.slice(0, n);",
-          "es5": "\"use strict\";\n\nvar take = function take(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(0, n);\n};",
+          "es5": "var take = function take(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(0, n);\n};",
           "example": "take([1, 2, 3], 5); // [1, 2, 3]\r\ntake([1, 2, 3], 0); // []"
         },
         "tags": [
@@ -6276,7 +6276,7 @@
         "text": "Returns an array with n elements removed from the end.\r\n\r\nUse `Array.prototype.slice()` to create a slice of the array with `n` elements taken from the end.",
         "codeBlocks": {
           "es6": "const takeRight = (arr, n = 1) => arr.slice(arr.length - n, arr.length);",
-          "es5": "\"use strict\";\n\nvar takeRight = function takeRight(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(arr.length - n, arr.length);\n};",
+          "es5": "var takeRight = function takeRight(arr) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return arr.slice(arr.length - n, arr.length);\n};",
           "example": "takeRight([1, 2, 3], 2); // [ 2, 3 ]\r\ntakeRight([1, 2, 3]); // [3]"
         },
         "tags": [
@@ -6297,7 +6297,7 @@
         "text": "Removes elements from the end of an array until the passed function returns `true`. Returns the removed elements.\r\n\r\nLoop through the array, using a `Array.prototype.reduceRight()` and accumulating elements while the function returns falsy value.",
         "codeBlocks": {
           "es6": "const takeRightWhile = (arr, func) =>\r\n  arr.reduceRight((acc, el) => (func(el) ? acc : [el, ...acc]), []);",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar takeRightWhile = function takeRightWhile(arr, func) {\n  return arr.reduceRight(function (acc, el) {\n    return func(el) ? acc : [el].concat(_toConsumableArray(acc));\n  }, []);\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar takeRightWhile = function takeRightWhile(arr, func) {\n  return arr.reduceRight(function (acc, el) {\n    return func(el) ? acc : [el].concat(_toConsumableArray(acc));\n  }, []);\n};",
           "example": "takeRightWhile([1, 2, 3, 4], n => n < 3); // [3, 4]"
         },
         "tags": [
@@ -6319,7 +6319,7 @@
         "text": "Removes elements in an array until the passed function returns `true`. Returns the removed elements.\r\n\r\nLoop through the array, using a `for...of` loop over `Array.prototype.entries()` until the returned value from the function is `true`.\r\nReturn the removed elements, using `Array.prototype.slice()`.",
         "codeBlocks": {
           "es6": "const takeWhile = (arr, func) => {\r\n  for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);\r\n  return arr;\r\n};",
-          "es5": "\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar takeWhile = function takeWhile(arr, func) {\n  var _iteratorNormalCompletion = true;\n  var _didIteratorError = false;\n  var _iteratorError = undefined;\n\n  try {\n    for (var _iterator = arr.entries()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n      var _step$value = _slicedToArray(_step.value, 2),\n          i = _step$value[0],\n          val = _step$value[1];\n\n      if (func(val)) return arr.slice(0, i);\n    }\n  } catch (err) {\n    _didIteratorError = true;\n    _iteratorError = err;\n  } finally {\n    try {\n      if (!_iteratorNormalCompletion && _iterator.return != null) {\n        _iterator.return();\n      }\n    } finally {\n      if (_didIteratorError) {\n        throw _iteratorError;\n      }\n    }\n  }\n\n  return arr;\n};",
+          "es5": "function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArrayLimit(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar takeWhile = function takeWhile(arr, func) {\n  var _iteratorNormalCompletion = true;\n  var _didIteratorError = false;\n  var _iteratorError = undefined;\n\n  try {\n    for (var _iterator = arr.entries()[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {\n      var _step$value = _slicedToArray(_step.value, 2),\n          i = _step$value[0],\n          val = _step$value[1];\n\n      if (func(val)) return arr.slice(0, i);\n    }\n  } catch (err) {\n    _didIteratorError = true;\n    _iteratorError = err;\n  } finally {\n    try {\n      if (!_iteratorNormalCompletion && _iterator.return != null) {\n        _iterator.return();\n      }\n    } finally {\n      if (_didIteratorError) {\n        throw _iteratorError;\n      }\n    }\n  }\n\n  return arr;\n};",
           "example": "takeWhile([1, 2, 3, 4], n => n >= 3); // [1, 2]"
         },
         "tags": [
@@ -6341,7 +6341,7 @@
         "text": "Creates a throttled function that only invokes the provided function at most once per every `wait` milliseconds\r\n\r\nUse `setTimeout()` and `clearTimeout()` to throttle the given method, `fn`.\r\nUse `Function.prototype.apply()` to apply the `this` context to the function and provide the necessary `arguments`.\r\nUse `Date.now()` to keep track of the last time the throttled function was invoked.\r\nOmit the second argument, `wait`, to set the timeout at a default of 0 ms.",
         "codeBlocks": {
           "es6": "const throttle = (fn, wait) => {\r\n  let inThrottle, lastFn, lastTime;\r\n  return function() {\r\n    const context = this,\r\n      args = arguments;\r\n    if (!inThrottle) {\r\n      fn.apply(context, args);\r\n      lastTime = Date.now();\r\n      inThrottle = true;\r\n    } else {\r\n      clearTimeout(lastFn);\r\n      lastFn = setTimeout(function() {\r\n        if (Date.now() - lastTime >= wait) {\r\n          fn.apply(context, args);\r\n          lastTime = Date.now();\r\n        }\r\n      }, Math.max(wait - (Date.now() - lastTime), 0));\r\n    }\r\n  };\r\n};",
-          "es5": "\"use strict\";\n\nvar throttle = function throttle(fn, wait) {\n  var inThrottle, lastFn, lastTime;\n  return function () {\n    var context = this,\n        args = arguments;\n\n    if (!inThrottle) {\n      fn.apply(context, args);\n      lastTime = Date.now();\n      inThrottle = true;\n    } else {\n      clearTimeout(lastFn);\n      lastFn = setTimeout(function () {\n        if (Date.now() - lastTime >= wait) {\n          fn.apply(context, args);\n          lastTime = Date.now();\n        }\n      }, Math.max(wait - (Date.now() - lastTime), 0));\n    }\n  };\n};",
+          "es5": "var throttle = function throttle(fn, wait) {\n  var inThrottle, lastFn, lastTime;\n  return function () {\n    var context = this,\n        args = arguments;\n\n    if (!inThrottle) {\n      fn.apply(context, args);\n      lastTime = Date.now();\n      inThrottle = true;\n    } else {\n      clearTimeout(lastFn);\n      lastFn = setTimeout(function () {\n        if (Date.now() - lastTime >= wait) {\n          fn.apply(context, args);\n          lastTime = Date.now();\n        }\n      }, Math.max(wait - (Date.now() - lastTime), 0));\n    }\n  };\n};",
           "example": "window.addEventListener(\r\n  'resize',\r\n  throttle(function(evt) {\r\n    console.log(window.innerWidth);\r\n    console.log(window.innerHeight);\r\n  }, 250)\r\n); // Will log the window dimensions at most every 250ms"
         },
         "tags": [
@@ -6362,7 +6362,7 @@
         "text": "Iterates over a callback `n` times\r\n\r\nUse `Function.call()` to call `fn` `n` times or until it returns `false`.\r\nOmit the last argument, `context`, to use an `undefined` object (or the global object in non-strict mode).",
         "codeBlocks": {
           "es6": "const times = (n, fn, context = undefined) => {\r\n  let i = 0;\r\n  while (fn.call(context, i) !== false && ++i < n) {}\r\n};",
-          "es5": "\"use strict\";\n\nvar times = function times(n, fn) {\n  var context = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : undefined;\n  var i = 0;\n\n  while (fn.call(context, i) !== false && ++i < n) {}\n};",
+          "es5": "var times = function times(n, fn) {\n  var context = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : undefined;\n  var i = 0;\n\n  while (fn.call(context, i) !== false && ++i < n) {}\n};",
           "example": "var output = '';\r\ntimes(5, i => (output += i));\r\nconsole.log(output); // 01234"
         },
         "tags": [
@@ -6383,7 +6383,7 @@
         "text": "Measures the time taken by a function to execute.\r\n\r\nUse `console.time()` and `console.timeEnd()` to measure the difference between the start and end times to determine how long the callback took to execute.",
         "codeBlocks": {
           "es6": "const timeTaken = callback => {\r\n  console.time('timeTaken');\r\n  const r = callback();\r\n  console.timeEnd('timeTaken');\r\n  return r;\r\n};",
-          "es5": "\"use strict\";\n\nvar timeTaken = function timeTaken(callback) {\n  console.time('timeTaken');\n  var r = callback();\n  console.timeEnd('timeTaken');\n  return r;\n};",
+          "es5": "var timeTaken = function timeTaken(callback) {\n  console.time('timeTaken');\n  var r = callback();\n  console.timeEnd('timeTaken');\n  return r;\n};",
           "example": "timeTaken(() => Math.pow(2, 10)); // 1024, (logged): timeTaken: 0.02099609375ms"
         },
         "tags": [
@@ -6404,7 +6404,7 @@
         "text": "Converts a string to camelcase.\r\n\r\nBreak the string into words and combine them capitalizing the first letter of each word, using a regexp.",
         "codeBlocks": {
           "es6": "const toCamelCase = str => {\r\n  let s =\r\n    str &&\r\n    str\r\n      .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)\r\n      .map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())\r\n      .join('');\r\n  return s.slice(0, 1).toLowerCase() + s.slice(1);\r\n};",
-          "es5": "\"use strict\";\n\nvar toCamelCase = function toCamelCase(str) {\n  var s = str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase();\n  }).join('');\n  return s.slice(0, 1).toLowerCase() + s.slice(1);\n};",
+          "es5": "var toCamelCase = function toCamelCase(str) {\n  var s = str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase();\n  }).join('');\n  return s.slice(0, 1).toLowerCase() + s.slice(1);\n};",
           "example": "toCamelCase('some_database_field_name'); // 'someDatabaseFieldName'\r\ntoCamelCase('Some label that needs to be camelized'); // 'someLabelThatNeedsToBeCamelized'\r\ntoCamelCase('some-javascript-property'); // 'someJavascriptProperty'\r\ntoCamelCase('some-mixed_string with spaces_underscores-and-hyphens'); // 'someMixedStringWithSpacesUnderscoresAndHyphens'"
         },
         "tags": [
@@ -6426,7 +6426,7 @@
         "text": "Take a number and return specified currency formatting.\r\n\r\nUse `Intl.NumberFormat` to enable country / currency sensitive formatting.",
         "codeBlocks": {
           "es6": "const toCurrency = (n, curr, LanguageFormat = undefined) =>\r\n  Intl.NumberFormat(LanguageFormat, { style: 'currency', currency: curr }).format(n);",
-          "es5": "\"use strict\";\n\nvar toCurrency = function toCurrency(n, curr) {\n  var LanguageFormat = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : undefined;\n  return Intl.NumberFormat(LanguageFormat, {\n    style: 'currency',\n    currency: curr\n  }).format(n);\n};",
+          "es5": "var toCurrency = function toCurrency(n, curr) {\n  var LanguageFormat = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : undefined;\n  return Intl.NumberFormat(LanguageFormat, {\n    style: 'currency',\n    currency: curr\n  }).format(n);\n};",
           "example": "toCurrency(123456.789, 'EUR'); // €123,456.79  | currency: Euro | currencyLangFormat: Local\r\ntoCurrency(123456.789, 'USD', 'en-us'); // $123,456.79  | currency: US Dollar | currencyLangFormat: English (United States)\r\ntoCurrency(123456.789, 'USD', 'fa'); // ۱۲۳٬۴۵۶٫۷۹ ؜$ | currency: US Dollar | currencyLangFormat: Farsi\r\ntoCurrency(322342436423.2435, 'JPY'); // ¥322,342,436,423 | currency: Japanese Yen | currencyLangFormat: Local\r\ntoCurrency(322342436423.2435, 'JPY', 'fi'); // 322 342 436 423 ¥ | currency: Japanese Yen | currencyLangFormat: Finnish"
         },
         "tags": [
@@ -6447,7 +6447,7 @@
         "text": "Use `toLocaleString()` to convert a float-point arithmetic to the [Decimal mark](https://en.wikipedia.org/wiki/Decimal_mark) form. It makes a comma separated string from a number.",
         "codeBlocks": {
           "es6": "const toDecimalMark = num => num.toLocaleString('en-US');",
-          "es5": "\"use strict\";\n\nvar toDecimalMark = function toDecimalMark(num) {\n  return num.toLocaleString('en-US');\n};",
+          "es5": "var toDecimalMark = function toDecimalMark(num) {\n  return num.toLocaleString('en-US');\n};",
           "example": "toDecimalMark(12305030388.9087); // \"12,305,030,388.909\""
         },
         "tags": [
@@ -6469,7 +6469,7 @@
         "text": "Toggle a class for an element.\r\n\r\nUse `element.classList.toggle()` to toggle the specified class for the element.",
         "codeBlocks": {
           "es6": "const toggleClass = (el, className) => el.classList.toggle(className);",
-          "es5": "\"use strict\";\n\nvar toggleClass = function toggleClass(el, className) {\n  return el.classList.toggle(className);\n};",
+          "es5": "var toggleClass = function toggleClass(el, className) {\n  return el.classList.toggle(className);\n};",
           "example": "toggleClass(document.querySelector('p.special'), 'special'); // The paragraph will not have the 'special' class anymore"
         },
         "tags": [
@@ -6490,7 +6490,7 @@
         "text": "Reduces a given Array-like into a value hash (keyed data store).\r\n\r\nGiven an Iterable or Array-like structure, call `Array.prototype.prototype.reduce.call()` on the provided object to step over it and return an Object, keyed by the reference value.",
         "codeBlocks": {
           "es6": "const toHash = (object, key) =>\r\n  Array.prototype.reduce.call(\r\n    object,\r\n    (acc, data, index) => ((acc[!key ? index : data[key]] = data), acc),\r\n    {}\r\n  );",
-          "es5": "\"use strict\";\n\nvar toHash = function toHash(object, key) {\n  return Array.prototype.reduce.call(object, function (acc, data, index) {\n    return acc[!key ? index : data[key]] = data, acc;\n  }, {});\n};",
+          "es5": "var toHash = function toHash(object, key) {\n  return Array.prototype.reduce.call(object, function (acc, data, index) {\n    return acc[!key ? index : data[key]] = data, acc;\n  }, {});\n};",
           "example": "toHash([4, 3, 2, 1]); // { 0: 4, 1: 3, 2: 2, 1: 1 }\r\ntoHash([{ a: 'label' }], 'a'); // { label: { a: 'label' } }\r\n// A more in depth example:\r\nlet users = [{ id: 1, first: 'Jon' }, { id: 2, first: 'Joe' }, { id: 3, first: 'Moe' }];\r\nlet managers = [{ manager: 1, employees: [2, 3] }];\r\n// We use function here because we want a bindable reference, but a closure referencing the hash would work, too.\r\nmanagers.forEach(\r\n  manager =>\r\n    (manager.employees = manager.employees.map(function(id) {\r\n      return this[id];\r\n    }, toHash(users, 'id')))\r\n);\r\nmanagers; // [ { manager:1, employees: [ { id: 2, first: \"Joe\" }, { id: 3, first: \"Moe\" } ] } ]"
         },
         "tags": [
@@ -6511,7 +6511,7 @@
         "text": "Converts a string to kebab case.\r\n\r\nBreak the string into words and combine them adding `-` as a separator, using a regexp.",
         "codeBlocks": {
           "es6": "const toKebabCase = str =>\r\n  str &&\r\n  str\r\n    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)\r\n    .map(x => x.toLowerCase())\r\n    .join('-');",
-          "es5": "\"use strict\";\n\nvar toKebabCase = function toKebabCase(str) {\n  return str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.toLowerCase();\n  }).join('-');\n};",
+          "es5": "var toKebabCase = function toKebabCase(str) {\n  return str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.toLowerCase();\n  }).join('-');\n};",
           "example": "toKebabCase('camelCase'); // 'camel-case'\r\ntoKebabCase('some text'); // 'some-text'\r\ntoKebabCase('some-mixed_string With spaces_underscores-and-hyphens'); // 'some-mixed-string-with-spaces-underscores-and-hyphens'\r\ntoKebabCase('AllThe-small Things'); // \"all-the-small-things\"\r\ntoKebabCase('IAmListeningToFMWhileLoadingDifferentURLOnMyBrowserAndAlsoEditingSomeXMLAndHTML'); // \"i-am-listening-to-fm-while-loading-different-url-on-my-browser-and-also-editing-xml-and-html\""
         },
         "tags": [
@@ -6533,7 +6533,7 @@
         "text": "Results in a string representation of tomorrow's date.\r\n\r\nUse `new Date()` to get today's date, adding one day using `Date.getDate()` and `Date.setDate()`, and converting the Date object to a string.",
         "codeBlocks": {
           "es6": "const tomorrow = (long = false) => {\r\n  let t = new Date();\r\n  t.setDate(t.getDate() + 1);\r\n  const ret = `${t.getFullYear()}-${String(t.getMonth() + 1).padStart(2, '0')}-${String(\r\n    t.getDate()\r\n  ).padStart(2, '0')}`;\r\n  return !long ? ret : `${ret}T00:00:00`;\r\n};",
-          "es5": "\"use strict\";\n\nvar tomorrow = function tomorrow() {\n  var long = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;\n  var t = new Date();\n  t.setDate(t.getDate() + 1);\n  var ret = \"\".concat(t.getFullYear(), \"-\").concat(String(t.getMonth() + 1).padStart(2, '0'), \"-\").concat(String(t.getDate()).padStart(2, '0'));\n  return !long ? ret : \"\".concat(ret, \"T00:00:00\");\n};",
+          "es5": "var tomorrow = function tomorrow() {\n  var long = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;\n  var t = new Date();\n  t.setDate(t.getDate() + 1);\n  var ret = \"\".concat(t.getFullYear(), \"-\").concat(String(t.getMonth() + 1).padStart(2, '0'), \"-\").concat(String(t.getDate()).padStart(2, '0'));\n  return !long ? ret : \"\".concat(ret, \"T00:00:00\");\n};",
           "example": "tomorrow(); // 2017-12-27 (if current date is 2017-12-26)\r\ntomorrow(true); // 2017-12-27T00:00:00 (if current date is 2017-12-26)"
         },
         "tags": [
@@ -6554,7 +6554,7 @@
         "text": "Adds an ordinal suffix to a number.\r\n\r\nUse the modulo operator (`%`) to find values of single and tens digits.\r\nFind which ordinal pattern digits match.\r\nIf digit is found in teens pattern, use teens ordinal.",
         "codeBlocks": {
           "es6": "const toOrdinalSuffix = num => {\r\n  const int = parseInt(num),\r\n    digits = [int % 10, int % 100],\r\n    ordinals = ['st', 'nd', 'rd', 'th'],\r\n    oPattern = [1, 2, 3, 4],\r\n    tPattern = [11, 12, 13, 14, 15, 16, 17, 18, 19];\r\n  return oPattern.includes(digits[0]) && !tPattern.includes(digits[1])\r\n    ? int + ordinals[digits[0] - 1]\r\n    : int + ordinals[3];\r\n};",
-          "es5": "\"use strict\";\n\nvar toOrdinalSuffix = function toOrdinalSuffix(num) {\n  var int = parseInt(num),\n      digits = [int % 10, int % 100],\n      ordinals = ['st', 'nd', 'rd', 'th'],\n      oPattern = [1, 2, 3, 4],\n      tPattern = [11, 12, 13, 14, 15, 16, 17, 18, 19];\n  return oPattern.includes(digits[0]) && !tPattern.includes(digits[1]) ? int + ordinals[digits[0] - 1] : int + ordinals[3];\n};",
+          "es5": "var toOrdinalSuffix = function toOrdinalSuffix(num) {\n  var int = parseInt(num),\n      digits = [int % 10, int % 100],\n      ordinals = ['st', 'nd', 'rd', 'th'],\n      oPattern = [1, 2, 3, 4],\n      tPattern = [11, 12, 13, 14, 15, 16, 17, 18, 19];\n  return oPattern.includes(digits[0]) && !tPattern.includes(digits[1]) ? int + ordinals[digits[0] - 1] : int + ordinals[3];\n};",
           "example": "toOrdinalSuffix('123'); // \"123rd\""
         },
         "tags": [
@@ -6576,7 +6576,7 @@
         "text": "Converts a value to a safe integer.\r\n\r\nUse `Math.max()` and `Math.min()` to find the closest safe value.\r\nUse `Math.round()` to convert to an integer.",
         "codeBlocks": {
           "es6": "const toSafeInteger = num =>\r\n  Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));",
-          "es5": "\"use strict\";\n\nvar toSafeInteger = function toSafeInteger(num) {\n  return Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));\n};",
+          "es5": "var toSafeInteger = function toSafeInteger(num) {\n  return Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));\n};",
           "example": "toSafeInteger('3.2'); // 3\r\ntoSafeInteger(Infinity); // 9007199254740991"
         },
         "tags": [
@@ -6597,7 +6597,7 @@
         "text": "Converts a string to snake case.\r\n\r\nBreak the string into words and combine them adding `_` as a separator, using a regexp.",
         "codeBlocks": {
           "es6": "const toSnakeCase = str =>\r\n  str &&\r\n  str\r\n    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)\r\n    .map(x => x.toLowerCase())\r\n    .join('_');",
-          "es5": "\"use strict\";\n\nvar toSnakeCase = function toSnakeCase(str) {\n  return str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.toLowerCase();\n  }).join('_');\n};",
+          "es5": "var toSnakeCase = function toSnakeCase(str) {\n  return str && str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.toLowerCase();\n  }).join('_');\n};",
           "example": "toSnakeCase('camelCase'); // 'camel_case'\r\ntoSnakeCase('some text'); // 'some_text'\r\ntoSnakeCase('some-mixed_string With spaces_underscores-and-hyphens'); // 'some_mixed_string_with_spaces_underscores_and_hyphens'\r\ntoSnakeCase('AllThe-small Things'); // \"all_the_smal_things\"\r\ntoSnakeCase('IAmListeningToFMWhileLoadingDifferentURLOnMyBrowserAndAlsoEditingSomeXMLAndHTML'); // \"i_am_listening_to_fm_while_loading_different_url_on_my_browser_and_also_editing_some_xml_and_html\""
         },
         "tags": [
@@ -6619,7 +6619,7 @@
         "text": "Converts a string to title case.\r\n\r\nBreak the string into words, using a regexp, and combine them capitalizing the first letter of each word and adding a whitespace between them.",
         "codeBlocks": {
           "es6": "const toTitleCase = str =>\r\n  str\r\n    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)\r\n    .map(x => x.charAt(0).toUpperCase() + x.slice(1))\r\n    .join(' ');",
-          "es5": "\"use strict\";\n\nvar toTitleCase = function toTitleCase(str) {\n  return str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.charAt(0).toUpperCase() + x.slice(1);\n  }).join(' ');\n};",
+          "es5": "var toTitleCase = function toTitleCase(str) {\n  return str.match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g).map(function (x) {\n    return x.charAt(0).toUpperCase() + x.slice(1);\n  }).join(' ');\n};",
           "example": "toTitleCase('some_database_field_name'); // 'Some Database Field Name'\r\ntoTitleCase('Some label that needs to be title-cased'); // 'Some Label That Needs To Be Title Cased'\r\ntoTitleCase('some-package-name'); // 'Some Package Name'\r\ntoTitleCase('some-mixed_string with spaces_underscores-and-hyphens'); // 'Some Mixed String With Spaces Underscores And Hyphens'"
         },
         "tags": [
@@ -6641,7 +6641,7 @@
         "text": "Applies a function against an accumulator and each key in the object (from left to right).\r\n\r\nUse `Object.keys(obj)` to iterate over each key in the object, `Array.prototype.reduce()` to call the apply the specified function against the given accumulator.",
         "codeBlocks": {
           "es6": "const transform = (obj, fn, acc) => Object.keys(obj).reduce((a, k) => fn(a, obj[k], k, obj), acc);",
-          "es5": "\"use strict\";\n\nvar transform = function transform(obj, fn, acc) {\n  return Object.keys(obj).reduce(function (a, k) {\n    return fn(a, obj[k], k, obj);\n  }, acc);\n};",
+          "es5": "var transform = function transform(obj, fn, acc) {\n  return Object.keys(obj).reduce(function (a, k) {\n    return fn(a, obj[k], k, obj);\n  }, acc);\n};",
           "example": "transform(\r\n  { a: 1, b: 2, c: 1 },\r\n  (r, v, k) => {\r\n    (r[v] || (r[v] = [])).push(k);\r\n    return r;\r\n  },\r\n  {}\r\n); // { '1': ['a', 'c'], '2': ['b'] }"
         },
         "tags": [
@@ -6663,7 +6663,7 @@
         "text": "Triggers a specific event on a given element, optionally passing custom data.\r\n\r\nUse `new CustomEvent()` to create an event from the specified `eventType` and details.\r\nUse `el.dispatchEvent()` to trigger the newly created event on the given element.\r\nOmit the third argument, `detail`, if you do not want to pass custom data to the triggered event.",
         "codeBlocks": {
           "es6": "const triggerEvent = (el, eventType, detail) =>\r\n  el.dispatchEvent(new CustomEvent(eventType, { detail }));",
-          "es5": "\"use strict\";\n\nvar triggerEvent = function triggerEvent(el, eventType, detail) {\n  return el.dispatchEvent(new CustomEvent(eventType, {\n    detail: detail\n  }));\n};",
+          "es5": "var triggerEvent = function triggerEvent(el, eventType, detail) {\n  return el.dispatchEvent(new CustomEvent(eventType, {\n    detail: detail\n  }));\n};",
           "example": "triggerEvent(document.getElementById('myId'), 'click');\r\ntriggerEvent(document.getElementById('myId'), 'click', { username: 'bob' });"
         },
         "tags": [
@@ -6685,7 +6685,7 @@
         "text": "Truncates a string up to a specified length.\r\n\r\nDetermine if the string's `length` is greater than `num`.\r\nReturn the string truncated to the desired length, with `'...'` appended to the end or the original string.",
         "codeBlocks": {
           "es6": "const truncateString = (str, num) =>\r\n  str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;",
-          "es5": "\"use strict\";\n\nvar truncateString = function truncateString(str, num) {\n  return str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;\n};",
+          "es5": "var truncateString = function truncateString(str, num) {\n  return str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;\n};",
           "example": "truncateString('boomerang', 7); // 'boom...'"
         },
         "tags": [
@@ -6706,7 +6706,7 @@
         "text": "Checks if the predicate (second argument) is truthy on all elements of a collection (first argument).\r\n\r\nUse `Array.prototype.every()` to check if each passed object has the specified property and if it returns a truthy value.",
         "codeBlocks": {
           "es6": "const truthCheckCollection = (collection, pre) => collection.every(obj => obj[pre]);",
-          "es5": "\"use strict\";\n\nvar truthCheckCollection = function truthCheckCollection(collection, pre) {\n  return collection.every(function (obj) {\n    return obj[pre];\n  });\n};",
+          "es5": "var truthCheckCollection = function truthCheckCollection(collection, pre) {\n  return collection.every(function (obj) {\n    return obj[pre];\n  });\n};",
           "example": "truthCheckCollection([{ user: 'Tinky-Winky', sex: 'male' }, { user: 'Dipsy', sex: 'male' }], 'sex'); // true"
         },
         "tags": [
@@ -6729,7 +6729,7 @@
         "text": "Creates a function that accepts up to one argument, ignoring any additional arguments.\r\n\r\nCall the provided function, `fn`, with just the first argument given.",
         "codeBlocks": {
           "es6": "const unary = fn => val => fn(val);",
-          "es5": "\"use strict\";\n\nvar unary = function unary(fn) {\n  return function (val) {\n    return fn(val);\n  };\n};",
+          "es5": "var unary = function unary(fn) {\n  return function (val) {\n    return fn(val);\n  };\n};",
           "example": "['6', '8', '10'].map(unary(parseInt)); // [6, 8, 10]"
         },
         "tags": [
@@ -6751,7 +6751,7 @@
         "text": "Uncurries a function up to depth `n`.\r\n\r\nReturn a variadic function.\r\nUse `Array.prototype.reduce()` on the provided arguments to call each subsequent curry level of the function.\r\nIf the `length` of the provided arguments is less than `n` throw an error.\r\nOtherwise, call `fn` with the proper amount of arguments, using `Array.prototype.slice(0, n)`.\r\nOmit the second argument, `n`, to uncurry up to depth `1`.",
         "codeBlocks": {
           "es6": "const uncurry = (fn, n = 1) => (...args) => {\r\n  const next = acc => args => args.reduce((x, y) => x(y), acc);\r\n  if (n > args.length) throw new RangeError('Arguments too few!');\r\n  return next(fn)(args.slice(0, n));\r\n};",
-          "es5": "\"use strict\";\n\nvar uncurry = function uncurry(fn) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return function () {\n    var next = function next(acc) {\n      return function (args) {\n        return args.reduce(function (x, y) {\n          return x(y);\n        }, acc);\n      };\n    };\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    if (n > args.length) throw new RangeError('Arguments too few!');\n    return next(fn)(args.slice(0, n));\n  };\n};",
+          "es5": "var uncurry = function uncurry(fn) {\n  var n = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;\n  return function () {\n    var next = function next(acc) {\n      return function (args) {\n        return args.reduce(function (x, y) {\n          return x(y);\n        }, acc);\n      };\n    };\n\n    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n      args[_key] = arguments[_key];\n    }\n\n    if (n > args.length) throw new RangeError('Arguments too few!');\n    return next(fn)(args.slice(0, n));\n  };\n};",
           "example": "const add = x => y => z => x + y + z;\r\nconst uncurriedAdd = uncurry(add, 3);\r\nuncurriedAdd(1, 2, 3); // 6"
         },
         "tags": [
@@ -6772,7 +6772,7 @@
         "text": "Unescapes escaped HTML characters.\r\n\r\nUse `String.prototype.replace()` with a regex that matches the characters that need to be unescaped, using a callback function to replace each escaped character instance with its associated unescaped character using a dictionary (object).",
         "codeBlocks": {
           "es6": "const unescapeHTML = str =>\r\n  str.replace(\r\n    /&amp;|&lt;|&gt;|&#39;|&quot;/g,\r\n    tag =>\r\n      ({\r\n        '&amp;': '&',\r\n        '&lt;': '<',\r\n        '&gt;': '>',\r\n        '&#39;': \"'\",\r\n        '&quot;': '\"'\r\n      }[tag] || tag)\r\n  );",
-          "es5": "\"use strict\";\n\nvar unescapeHTML = function unescapeHTML(str) {\n  return str.replace(/&amp;|&lt;|&gt;|&#39;|&quot;/g, function (tag) {\n    return {\n      '&amp;': '&',\n      '&lt;': '<',\n      '&gt;': '>',\n      '&#39;': \"'\",\n      '&quot;': '\"'\n    }[tag] || tag;\n  });\n};",
+          "es5": "var unescapeHTML = function unescapeHTML(str) {\n  return str.replace(/&amp;|&lt;|&gt;|&#39;|&quot;/g, function (tag) {\n    return {\n      '&amp;': '&',\n      '&lt;': '<',\n      '&gt;': '>',\n      '&#39;': \"'\",\n      '&quot;': '\"'\n    }[tag] || tag;\n  });\n};",
           "example": "unescapeHTML('&lt;a href=&quot;#&quot;&gt;Me &amp; you&lt;/a&gt;'); // '<a href=\"#\">Me & you</a>'"
         },
         "tags": [
@@ -6794,7 +6794,7 @@
         "text": "Unflatten an object with the paths for keys.\r\n\r\nUse `Object.keys(obj)` combined with `Array.prototype.reduce()` to convert flattened path node to a leaf node.\r\nIf the value of a key contains a dot delimiter (`.`), use `Array.prototype.split('.')`, string transformations and `JSON.parse()` to create an object, then `Object.assign()` to create the leaf node.\r\nOtherwise, add the appropriate key-value pair to the accumulator object.",
         "codeBlocks": {
           "es6": "const unflattenObject = obj =>\r\n  Object.keys(obj).reduce((acc, k) => {\r\n    if (k.indexOf('.') !== -1) {\r\n      const keys = k.split('.');\r\n      Object.assign(\r\n        acc,\r\n        JSON.parse(\r\n          '{' +\r\n            keys.map((v, i) => (i !== keys.length - 1 ? `\"${v}\":{` : `\"${v}\":`)).join('') +\r\n            obj[k] +\r\n            '}'.repeat(keys.length)\r\n        )\r\n      );\r\n    } else acc[k] = obj[k];\r\n    return acc;\r\n  }, {});",
-          "es5": "\"use strict\";\n\nvar unflattenObject = function unflattenObject(obj) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    if (k.indexOf('.') !== -1) {\n      var keys = k.split('.');\n      Object.assign(acc, JSON.parse('{' + keys.map(function (v, i) {\n        return i !== keys.length - 1 ? \"\\\"\".concat(v, \"\\\":{\") : \"\\\"\".concat(v, \"\\\":\");\n      }).join('') + obj[k] + '}'.repeat(keys.length)));\n    } else acc[k] = obj[k];\n\n    return acc;\n  }, {});\n};",
+          "es5": "var unflattenObject = function unflattenObject(obj) {\n  return Object.keys(obj).reduce(function (acc, k) {\n    if (k.indexOf('.') !== -1) {\n      var keys = k.split('.');\n      Object.assign(acc, JSON.parse('{' + keys.map(function (v, i) {\n        return i !== keys.length - 1 ? \"\\\"\".concat(v, \"\\\":{\") : \"\\\"\".concat(v, \"\\\":\");\n      }).join('') + obj[k] + '}'.repeat(keys.length)));\n    } else acc[k] = obj[k];\n\n    return acc;\n  }, {});\n};",
           "example": "unflattenObject({ 'a.b.c': 1, d: 1 }); // { a: { b: { c: 1 } }, d: 1 }"
         },
         "tags": [
@@ -6815,7 +6815,7 @@
         "text": "Builds an array, using an iterator function and an initial seed value.\r\n\r\nUse a `while` loop and `Array.prototype.push()` to call the function repeatedly until it returns `false`.\r\nThe iterator function accepts one argument (`seed`) and must always return an array with two elements ([`value`, `nextSeed`]) or `false` to terminate.",
         "codeBlocks": {
           "es6": "const unfold = (fn, seed) => {\r\n  let result = [],\r\n    val = [null, seed];\r\n  while ((val = fn(val[1]))) result.push(val[0]);\r\n  return result;\r\n};",
-          "es5": "\"use strict\";\n\nvar unfold = function unfold(fn, seed) {\n  var result = [],\n      val = [null, seed];\n\n  while (val = fn(val[1])) {\n    result.push(val[0]);\n  }\n\n  return result;\n};",
+          "es5": "var unfold = function unfold(fn, seed) {\n  var result = [],\n      val = [null, seed];\n\n  while (val = fn(val[1])) {\n    result.push(val[0]);\n  }\n\n  return result;\n};",
           "example": "var f = n => (n > 50 ? false : [-n, n + 10]);\r\nunfold(f, 10); // [-10, -20, -30, -40, -50]"
         },
         "tags": [
@@ -6837,7 +6837,7 @@
         "text": "Returns every element that exists in any of the two arrays once.\r\n\r\nCreate a `Set` with all values of `a` and `b` and convert to an array.",
         "codeBlocks": {
           "es6": "const union = (a, b) => Array.from(new Set([...a, ...b]));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar union = function union(a, b) {\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b))));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar union = function union(a, b) {\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b))));\n};",
           "example": "union([1, 2, 3], [4, 3, 2]); // [1,2,3,4]"
         },
         "tags": [
@@ -6859,7 +6859,7 @@
         "text": "Returns every element that exists in any of the two arrays once, after applying the provided function to each array element of both.\r\n\r\nCreate a `Set` by applying all `fn` to all values of `a`.\r\nCreate a `Set` from `a` and all elements in `b` whose value, after applying `fn` does not match a value in the previously created set.\r\nReturn the last set converted to an array.",
         "codeBlocks": {
           "es6": "const unionBy = (a, b, fn) => {\r\n  const s = new Set(a.map(fn));\r\n  return Array.from(new Set([...a, ...b.filter(x => !s.has(fn(x)))]));\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unionBy = function unionBy(a, b, fn) {\n  var s = new Set(a.map(fn));\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b.filter(function (x) {\n    return !s.has(fn(x));\n  })))));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unionBy = function unionBy(a, b, fn) {\n  var s = new Set(a.map(fn));\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b.filter(function (x) {\n    return !s.has(fn(x));\n  })))));\n};",
           "example": "unionBy([2.1], [1.2, 2.3], Math.floor); // [2.1, 1.2]"
         },
         "tags": [
@@ -6881,7 +6881,7 @@
         "text": "Returns every element that exists in any of the two arrays once, using a provided comparator function.\r\n\r\nCreate a `Set` with all values of `a` and values in `b` for which the comparator finds no matches in `a`, using `Array.prototype.findIndex()`.",
         "codeBlocks": {
           "es6": "const unionWith = (a, b, comp) =>\r\n  Array.from(new Set([...a, ...b.filter(x => a.findIndex(y => comp(x, y)) === -1)]));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unionWith = function unionWith(a, b, comp) {\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b.filter(function (x) {\n    return a.findIndex(function (y) {\n      return comp(x, y);\n    }) === -1;\n  })))));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unionWith = function unionWith(a, b, comp) {\n  return Array.from(new Set(_toConsumableArray(a).concat(_toConsumableArray(b.filter(function (x) {\n    return a.findIndex(function (y) {\n      return comp(x, y);\n    }) === -1;\n  })))));\n};",
           "example": "unionWith([1, 1.2, 1.5, 3, 0], [1.9, 3, 0, 3.9], (a, b) => Math.round(a) === Math.round(b)); // [1, 1.2, 1.5, 3, 0, 3.9]"
         },
         "tags": [
@@ -6903,7 +6903,7 @@
         "text": "Returns all unique values of an array.\r\n\r\nUse ES6 `Set` and the `...rest` operator to discard all duplicated values.",
         "codeBlocks": {
           "es6": "const uniqueElements = arr => [...new Set(arr)];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar uniqueElements = function uniqueElements(arr) {\n  return _toConsumableArray(new Set(arr));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar uniqueElements = function uniqueElements(arr) {\n  return _toConsumableArray(new Set(arr));\n};",
           "example": "uniqueElements([1, 2, 2, 3, 4, 4, 5]); // [1, 2, 3, 4, 5]"
         },
         "tags": [
@@ -6924,7 +6924,7 @@
         "text": "Returns all unique values of an array, based on a provided comparator function.\r\n\r\nUse `Array.prototype.reduce()` and `Array.prototype.some()` for an array containing only the first unique occurence of each value, based on the comparator function, `fn`.\r\nThe comparator function takes two arguments: the values of the two elements being compared.",
         "codeBlocks": {
           "es6": "const uniqueElementsBy = (arr, fn) =>\r\n  arr.reduce((acc, v) => {\r\n    if (!acc.some(x => fn(v, x))) acc.push(v);\r\n    return acc;\r\n  }, []);",
-          "es5": "\"use strict\";\n\nvar uniqueElementsBy = function uniqueElementsBy(arr, fn) {\n  return arr.reduce(function (acc, v) {\n    if (!acc.some(function (x) {\n      return fn(v, x);\n    })) acc.push(v);\n    return acc;\n  }, []);\n};",
+          "es5": "var uniqueElementsBy = function uniqueElementsBy(arr, fn) {\n  return arr.reduce(function (acc, v) {\n    if (!acc.some(function (x) {\n      return fn(v, x);\n    })) acc.push(v);\n    return acc;\n  }, []);\n};",
           "example": "uniqueElementsBy(\r\n  [\r\n    { id: 0, value: 'a' },\r\n    { id: 1, value: 'b' },\r\n    { id: 2, value: 'c' },\r\n    { id: 1, value: 'd' },\r\n    { id: 0, value: 'e' }\r\n  ],\r\n  (a, b) => a.id == b.id\r\n); // [ { id: 0, value: 'a' }, { id: 1, value: 'b' }, { id: 2, value: 'c' } ]"
         },
         "tags": [
@@ -6946,7 +6946,7 @@
         "text": "Returns all unique values of an array, based on a provided comparator function.\r\n\r\nUse `Array.prototype.reduce()` and `Array.prototype.some()` for an array containing only the last unique occurence of each value, based on the comparator function, `fn`.\r\nThe comparator function takes two arguments: the values of the two elements being compared.",
         "codeBlocks": {
           "es6": "const uniqueElementsByRight = (arr, fn) =>\r\n  arr.reduceRight((acc, v) => {\r\n    if (!acc.some(x => fn(v, x))) acc.push(v);\r\n    return acc;\r\n  }, []);",
-          "es5": "\"use strict\";\n\nvar uniqueElementsByRight = function uniqueElementsByRight(arr, fn) {\n  return arr.reduceRight(function (acc, v) {\n    if (!acc.some(function (x) {\n      return fn(v, x);\n    })) acc.push(v);\n    return acc;\n  }, []);\n};",
+          "es5": "var uniqueElementsByRight = function uniqueElementsByRight(arr, fn) {\n  return arr.reduceRight(function (acc, v) {\n    if (!acc.some(function (x) {\n      return fn(v, x);\n    })) acc.push(v);\n    return acc;\n  }, []);\n};",
           "example": "uniqueElementsByRight(\r\n  [\r\n    { id: 0, value: 'a' },\r\n    { id: 1, value: 'b' },\r\n    { id: 2, value: 'c' },\r\n    { id: 1, value: 'd' },\r\n    { id: 0, value: 'e' }\r\n  ],\r\n  (a, b) => a.id == b.id\r\n); // [ { id: 0, value: 'e' }, { id: 1, value: 'd' }, { id: 2, value: 'c' } ]"
         },
         "tags": [
@@ -6968,7 +6968,7 @@
         "text": "Returns the unique symmetric difference between two arrays, not containing duplicate values from either array.\r\n\r\nUse `Array.prototype.filter()` and `Array.prototype.includes()` on each array to remove values contained in the other, then create a `Set` from the results, removing duplicate values.",
         "codeBlocks": {
           "es6": "const uniqueSymmetricDifference = (a, b) => [\r\n  ...new Set([...a.filter(v => !b.includes(v)), ...b.filter(v => !a.includes(v))])\r\n];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar uniqueSymmetricDifference = function uniqueSymmetricDifference(a, b) {\n  return _toConsumableArray(new Set(_toConsumableArray(a.filter(function (v) {\n    return !b.includes(v);\n  })).concat(_toConsumableArray(b.filter(function (v) {\n    return !a.includes(v);\n  })))));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar uniqueSymmetricDifference = function uniqueSymmetricDifference(a, b) {\n  return _toConsumableArray(new Set(_toConsumableArray(a.filter(function (v) {\n    return !b.includes(v);\n  })).concat(_toConsumableArray(b.filter(function (v) {\n    return !a.includes(v);\n  })))));\n};",
           "example": "uniqueSymmetricDifference([1, 2, 3], [1, 2, 4]); // [3, 4]\r\nuniqueSymmetricDifference([1, 2, 2], [1, 3, 1]); // [2, 3]"
         },
         "tags": [
@@ -6990,7 +6990,7 @@
         "text": "Converts a tilde path to an absolute path.\r\n\r\nUse `String.prototype.replace()` with a regular expression and `OS.homedir()` to replace the `~` in the start of the path with the home directory.",
         "codeBlocks": {
           "es6": "const untildify = str => str.replace(/^~($|\\/|\\\\)/, `${require('os').homedir()}$1`);",
-          "es5": "\"use strict\";\n\nvar untildify = function untildify(str) {\n  return str.replace(/^~($|\\/|\\\\)/, \"\".concat(require('os').homedir(), \"$1\"));\n};",
+          "es5": "var untildify = function untildify(str) {\n  return str.replace(/^~($|\\/|\\\\)/, \"\".concat(require('os').homedir(), \"$1\"));\n};",
           "example": "untildify('~/node'); // '/Users/aUser/node'"
         },
         "tags": [
@@ -7012,7 +7012,7 @@
         "text": "Creates an array of arrays, ungrouping the elements in an array produced by [zip](#zip).\r\n\r\nUse `Math.max.apply()` to get the longest subarray in the array, `Array.prototype.map()` to make each element an array.\r\nUse `Array.prototype.reduce()` and `Array.prototype.forEach()` to map grouped values to individual arrays.",
         "codeBlocks": {
           "es6": "const unzip = arr =>\r\n  arr.reduce(\r\n    (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),\r\n    Array.from({\r\n      length: Math.max(...arr.map(x => x.length))\r\n    }).map(x => [])\r\n  );",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unzip = function unzip(arr) {\n  return arr.reduce(function (acc, val) {\n    return val.forEach(function (v, i) {\n      return acc[i].push(v);\n    }), acc;\n  }, Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(arr.map(function (x) {\n      return x.length;\n    })))\n  }).map(function (x) {\n    return [];\n  }));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unzip = function unzip(arr) {\n  return arr.reduce(function (acc, val) {\n    return val.forEach(function (v, i) {\n      return acc[i].push(v);\n    }), acc;\n  }, Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(arr.map(function (x) {\n      return x.length;\n    })))\n  }).map(function (x) {\n    return [];\n  }));\n};",
           "example": "unzip([['a', 1, true], ['b', 2, false]]); // [['a', 'b'], [1, 2], [true, false]]\r\nunzip([['a', 1, true], ['b', 2]]); // [['a', 'b'], [1, 2], [true]]"
         },
         "tags": [
@@ -7033,7 +7033,7 @@
         "text": "Creates an array of elements, ungrouping the elements in an array produced by [zip](#zip) and applying the provided function.\r\n\r\nUse `Math.max.apply()` to get the longest subarray in the array, `Array.prototype.map()` to make each element an array.\r\nUse `Array.prototype.reduce()` and `Array.prototype.forEach()` to map grouped values to individual arrays.\r\nUse `Array.prototype.map()` and the spread operator (`...`) to apply `fn` to each individual group of elements.",
         "codeBlocks": {
           "es6": "const unzipWith = (arr, fn) =>\r\n  arr\r\n    .reduce(\r\n      (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),\r\n      Array.from({\r\n        length: Math.max(...arr.map(x => x.length))\r\n      }).map(x => [])\r\n    )\r\n    .map(val => fn(...val));",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unzipWith = function unzipWith(arr, fn) {\n  return arr.reduce(function (acc, val) {\n    return val.forEach(function (v, i) {\n      return acc[i].push(v);\n    }), acc;\n  }, Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(arr.map(function (x) {\n      return x.length;\n    })))\n  }).map(function (x) {\n    return [];\n  })).map(function (val) {\n    return fn.apply(void 0, _toConsumableArray(val));\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar unzipWith = function unzipWith(arr, fn) {\n  return arr.reduce(function (acc, val) {\n    return val.forEach(function (v, i) {\n      return acc[i].push(v);\n    }), acc;\n  }, Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(arr.map(function (x) {\n      return x.length;\n    })))\n  }).map(function (x) {\n    return [];\n  })).map(function (val) {\n    return fn.apply(void 0, _toConsumableArray(val));\n  });\n};",
           "example": "unzipWith([[1, 10, 100], [2, 20, 200]], (...args) => args.reduce((acc, v) => acc + v, 0)); // [3, 30, 300]"
         },
         "tags": [
@@ -7055,7 +7055,7 @@
         "text": "Joins all given URL segments together, then normalizes the resulting URL.\r\n\r\nUse `String.prototype.join('/')` to combine URL segments, then a series of `String.prototype.replace()` calls with various regexps to normalize the resulting URL (remove double slashes, add proper slashes for protocol, remove slashes before parameters, combine parameters with `'&'` and normalize first parameter delimiter).",
         "codeBlocks": {
           "es6": "const URLJoin = (...args) =>\r\n  args\r\n    .join('/')\r\n    .replace(/[\\/]+/g, '/')\r\n    .replace(/^(.+):\\//, '$1://')\r\n    .replace(/^file:/, 'file:/')\r\n    .replace(/\\/(\\?|&|#[^!])/g, '$1')\r\n    .replace(/\\?/g, '&')\r\n    .replace('&', '?');",
-          "es5": "\"use strict\";\n\nvar URLJoin = function URLJoin() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.join('/').replace(/[\\/]+/g, '/').replace(/^(.+):\\//, '$1://').replace(/^file:/, 'file:/').replace(/\\/(\\?|&|#[^!])/g, '$1').replace(/\\?/g, '&').replace('&', '?');\n};",
+          "es5": "var URLJoin = function URLJoin() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.join('/').replace(/[\\/]+/g, '/').replace(/^(.+):\\//, '$1://').replace(/^file:/, 'file:/').replace(/\\/(\\?|&|#[^!])/g, '$1').replace(/\\?/g, '&').replace('&', '?');\n};",
           "example": "URLJoin('http://www.google.com', 'a', '/b/cd', '?foo=123', '?bar=foo'); // 'http://www.google.com/a/b/cd?foo=123&bar=foo'"
         },
         "tags": [
@@ -7078,7 +7078,7 @@
         "text": "Generates a UUID in a browser.\r\n\r\nUse `crypto` API to generate a UUID, compliant with [RFC4122](https://www.ietf.org/rfc/rfc4122.txt) version 4.",
         "codeBlocks": {
           "es6": "const UUIDGeneratorBrowser = () =>\r\n  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>\r\n    (c ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16)\r\n  );",
-          "es5": "\"use strict\";\n\nvar UUIDGeneratorBrowser = function UUIDGeneratorBrowser() {\n  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, function (c) {\n    return (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16);\n  });\n};",
+          "es5": "var UUIDGeneratorBrowser = function UUIDGeneratorBrowser() {\n  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, function (c) {\n    return (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16);\n  });\n};",
           "example": "UUIDGeneratorBrowser(); // '7982fcfe-5721-4632-bede-6000885be57d'"
         },
         "tags": [
@@ -7101,7 +7101,7 @@
         "text": "Generates a UUID in Node.JS.\r\n\r\nUse `crypto` API to generate a UUID, compliant with [RFC4122](https://www.ietf.org/rfc/rfc4122.txt) version 4.",
         "codeBlocks": {
           "es6": "const crypto = require('crypto');\r\nconst UUIDGeneratorNode = () =>\r\n  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>\r\n    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)\r\n  );",
-          "es5": "\"use strict\";\n\nvar crypto = require('crypto');\n\nvar UUIDGeneratorNode = function UUIDGeneratorNode() {\n  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, function (c) {\n    return (c ^ crypto.randomBytes(1)[0] & 15 >> c / 4).toString(16);\n  });\n};",
+          "es5": "var crypto = require('crypto');\n\nvar UUIDGeneratorNode = function UUIDGeneratorNode() {\n  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, function (c) {\n    return (c ^ crypto.randomBytes(1)[0] & 15 >> c / 4).toString(16);\n  });\n};",
           "example": "UUIDGeneratorNode(); // '79c7c136-60ee-40a2-beb2-856f1feabefc'"
         },
         "tags": [
@@ -7124,7 +7124,7 @@
         "text": "Returns `true` if the given value is a number, `false` otherwise.\r\n\r\nUse `!isNaN()` in combination with `parseFloat()` to check if the argument is a number.\r\nUse `isFinite()` to check if the number is finite.\r\nUse `Number()` to check if the coercion holds.",
         "codeBlocks": {
           "es6": "const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;",
-          "es5": "\"use strict\";\n\nvar validateNumber = function validateNumber(n) {\n  return !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;\n};",
+          "es5": "var validateNumber = function validateNumber(n) {\n  return !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;\n};",
           "example": "validateNumber('10'); // true"
         },
         "tags": [
@@ -7146,7 +7146,7 @@
         "text": "Tests a value, `x`, against a predicate function. If `true`, return `fn(x)`. Else, return `x`. \r\n\r\nReturn a function expecting a single value, `x`, that returns the appropriate value based on `pred`.",
         "codeBlocks": {
           "es6": "const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);",
-          "es5": "\"use strict\";\n\nvar when = function when(pred, whenTrue) {\n  return function (x) {\n    return pred(x) ? whenTrue(x) : x;\n  };\n};",
+          "es5": "var when = function when(pred, whenTrue) {\n  return function (x) {\n    return pred(x) ? whenTrue(x) : x;\n  };\n};",
           "example": "const doubleEvenNumbers = when(x => x % 2 === 0, x => x * 2);\r\ndoubleEvenNumbers(2); // 4\r\ndoubleEvenNumbers(1); // 1"
         },
         "tags": [
@@ -7167,7 +7167,7 @@
         "text": "Filters out the elements of an array, that have one of the specified values.\r\n\r\nUse `Array.prototype.filter()` to create an array excluding(using `!Array.includes()`) all given values.\r\n\r\n_(For a snippet that mutates the original array see [`pull`](#pull))_",
         "codeBlocks": {
           "es6": "const without = (arr, ...args) => arr.filter(v => !args.includes(v));",
-          "es5": "\"use strict\";\n\nvar without = function without(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return arr.filter(function (v) {\n    return !args.includes(v);\n  });\n};",
+          "es5": "var without = function without(arr) {\n  for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {\n    args[_key - 1] = arguments[_key];\n  }\n\n  return arr.filter(function (v) {\n    return !args.includes(v);\n  });\n};",
           "example": "without([2, 1, 2, 3], 1, 2); // [3]"
         },
         "tags": [
@@ -7188,7 +7188,7 @@
         "text": "Converts a given string into an array of words.\r\n\r\nUse `String.prototype.split()` with a supplied pattern (defaults to non-alpha as a regexp) to convert to an array of strings. Use `Array.prototype.filter()` to remove any empty strings.\r\nOmit the second argument to use the default regexp.",
         "codeBlocks": {
           "es6": "const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);",
-          "es5": "\"use strict\";\n\nvar words = function words(str) {\n  var pattern = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : /[^a-zA-Z-]+/;\n  return str.split(pattern).filter(Boolean);\n};",
+          "es5": "var words = function words(str) {\n  var pattern = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : /[^a-zA-Z-]+/;\n  return str.split(pattern).filter(Boolean);\n};",
           "example": "words('I love javaScript!!'); // [\"I\", \"love\", \"javaScript\"]\r\nwords('python, javaScript & coffee'); // [\"python\", \"javaScript\", \"coffee\"]"
         },
         "tags": [
@@ -7210,7 +7210,7 @@
         "text": "Creates a new array out of the two supplied by creating each possible pair from the arrays.\r\n\r\nUse `Array.prototype.reduce()`, `Array.prototype.map()` and `Array.prototype.concat()` to produce every possible pair from the elements of the two arrays and save them in an array.",
         "codeBlocks": {
           "es6": "const xProd = (a, b) => a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);",
-          "es5": "\"use strict\";\n\nvar xProd = function xProd(a, b) {\n  return a.reduce(function (acc, x) {\n    return acc.concat(b.map(function (y) {\n      return [x, y];\n    }));\n  }, []);\n};",
+          "es5": "var xProd = function xProd(a, b) {\n  return a.reduce(function (acc, x) {\n    return acc.concat(b.map(function (y) {\n      return [x, y];\n    }));\n  }, []);\n};",
           "example": "xProd([1, 2], ['a', 'b']); // [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]"
         },
         "tags": [
@@ -7232,7 +7232,7 @@
         "text": "Returns `true` if the string is `y`/`yes` or `false` if the string is `n`/`no`.\r\n\r\nUse `RegExp.test()` to check if the string evaluates to `y/yes` or `n/no`.\r\nOmit the second argument, `def` to set the default answer as `no`.",
         "codeBlocks": {
           "es6": "const yesNo = (val, def = false) =>\r\n  /^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;",
-          "es5": "\"use strict\";\n\nvar yesNo = function yesNo(val) {\n  var def = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return /^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;\n};",
+          "es5": "var yesNo = function yesNo(val) {\n  var def = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n  return /^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;\n};",
           "example": "yesNo('Y'); // true\r\nyesNo('yes'); // true\r\nyesNo('No'); // false\r\nyesNo('Foo', true); // true"
         },
         "tags": [
@@ -7254,7 +7254,7 @@
         "text": "Creates an array of elements, grouped based on the position in the original arrays.\r\n\r\nUse `Math.max.apply()` to get the longest array in the arguments.\r\nCreates an array with that length as return value and use `Array.from()` with a map-function to create an array of grouped elements.\r\nIf lengths of the argument-arrays vary, `undefined` is used where no value could be found.",
         "codeBlocks": {
           "es6": "const zip = (...arrays) => {\r\n  const maxLength = Math.max(...arrays.map(x => x.length));\r\n  return Array.from({ length: maxLength }).map((_, i) => {\r\n    return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]);\r\n  });\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar zip = function zip() {\n  for (var _len = arguments.length, arrays = new Array(_len), _key = 0; _key < _len; _key++) {\n    arrays[_key] = arguments[_key];\n  }\n\n  var maxLength = Math.max.apply(Math, _toConsumableArray(arrays.map(function (x) {\n    return x.length;\n  })));\n  return Array.from({\n    length: maxLength\n  }).map(function (_, i) {\n    return Array.from({\n      length: arrays.length\n    }, function (_, k) {\n      return arrays[k][i];\n    });\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar zip = function zip() {\n  for (var _len = arguments.length, arrays = new Array(_len), _key = 0; _key < _len; _key++) {\n    arrays[_key] = arguments[_key];\n  }\n\n  var maxLength = Math.max.apply(Math, _toConsumableArray(arrays.map(function (x) {\n    return x.length;\n  })));\n  return Array.from({\n    length: maxLength\n  }).map(function (_, i) {\n    return Array.from({\n      length: arrays.length\n    }, function (_, k) {\n      return arrays[k][i];\n    });\n  });\n};",
           "example": "zip(['a', 'b'], [1, 2], [true, false]); // [['a', 1, true], ['b', 2, false]]\r\nzip(['a'], [1, 2], [true, false]); // [['a', 1, true], [undefined, 2, false]]"
         },
         "tags": [
@@ -7275,7 +7275,7 @@
         "text": "Given an array of valid property identifiers and an array of values, return an object associating the properties to the values.\r\n\r\nSince an object can have undefined values but not undefined property pointers, the array of properties is used to decide the structure of the resulting object using `Array.prototype.reduce()`.",
         "codeBlocks": {
           "es6": "const zipObject = (props, values) =>\r\n  props.reduce((obj, prop, index) => ((obj[prop] = values[index]), obj), {});",
-          "es5": "\"use strict\";\n\nvar zipObject = function zipObject(props, values) {\n  return props.reduce(function (obj, prop, index) {\n    return obj[prop] = values[index], obj;\n  }, {});\n};",
+          "es5": "var zipObject = function zipObject(props, values) {\n  return props.reduce(function (obj, prop, index) {\n    return obj[prop] = values[index], obj;\n  }, {});\n};",
           "example": "zipObject(['a', 'b', 'c'], [1, 2]); // {a: 1, b: 2, c: undefined}\r\nzipObject(['a', 'b'], [1, 2, 3]); // {a: 1, b: 2}"
         },
         "tags": [
@@ -7297,7 +7297,7 @@
         "text": "Creates an array of elements, grouped based on the position in the original arrays and using function as the last value to specify how grouped values should be combined.\r\n\r\nCheck if the last argument provided is a function.\r\nUse `Math.max()` to get the longest array in the arguments.\r\nCreates an array with that length as return value and use `Array.from()` with a map-function to create an array of grouped elements.\r\nIf lengths of the argument-arrays vary, `undefined` is used where no value could be found.\r\nThe function is invoked with the elements of each group `(...group)`.",
         "codeBlocks": {
           "es6": "const zipWith = (...array) => {\r\n  const fn = typeof array[array.length - 1] === 'function' ? array.pop() : undefined;\r\n  return Array.from(\r\n    { length: Math.max(...array.map(a => a.length)) },\r\n    (_, i) => (fn ? fn(...array.map(a => a[i])) : array.map(a => a[i]))\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar zipWith = function zipWith() {\n  for (var _len = arguments.length, array = new Array(_len), _key = 0; _key < _len; _key++) {\n    array[_key] = arguments[_key];\n  }\n\n  var fn = typeof array[array.length - 1] === 'function' ? array.pop() : undefined;\n  return Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(array.map(function (a) {\n      return a.length;\n    })))\n  }, function (_, i) {\n    return fn ? fn.apply(void 0, _toConsumableArray(array.map(function (a) {\n      return a[i];\n    }))) : array.map(function (a) {\n      return a[i];\n    });\n  });\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar zipWith = function zipWith() {\n  for (var _len = arguments.length, array = new Array(_len), _key = 0; _key < _len; _key++) {\n    array[_key] = arguments[_key];\n  }\n\n  var fn = typeof array[array.length - 1] === 'function' ? array.pop() : undefined;\n  return Array.from({\n    length: Math.max.apply(Math, _toConsumableArray(array.map(function (a) {\n      return a.length;\n    })))\n  }, function (_, i) {\n    return fn ? fn.apply(void 0, _toConsumableArray(array.map(function (a) {\n      return a[i];\n    }))) : array.map(function (a) {\n      return a[i];\n    });\n  });\n};",
           "example": "zipWith([1, 2], [10, 20], [100, 200], (a, b, c) => a + b + c); // [111,222]\r\nzipWith(\r\n  [1, 2, 3],\r\n  [10, 20],\r\n  [100, 200],\r\n  (a, b, c) => (a != null ? a : 'a') + (b != null ? b : 'b') + (c != null ? c : 'c')\r\n); // [111, 222, '3bc']"
         },
         "tags": [
@@ -7319,7 +7319,7 @@
         "text": "Use recursion. Similar to `Array.prototype.indexOf()` that finds the index of a value within an array.\r\nThe difference being this operation only works with sorted arrays which offers a major performance boost due to it's logarithmic nature when compared to a linear search or `Array.prototype.indexOf()`.\r\n\r\nSearch a sorted array by repeatedly dividing the search interval in half.\r\nBegin with an interval covering the whole array.\r\nIf the value of the search is less than the item in the middle of the interval, recurse into the lower half. Otherwise recurse into the upper half.\r\nRepeatedly recurse until the value is found which is the mid or you've recursed to a point that is greater than the length which means the value doesn't exist and return `-1`.",
         "codeBlocks": {
           "es6": "const binarySearch = (arr, val, start = 0, end = arr.length - 1) => {\r\n  if (start > end) return -1;\r\n  const mid = Math.floor((start + end) / 2);\r\n  if (arr[mid] > val) return binarySearch(arr, val, start, mid - 1);\r\n  if (arr[mid] < val) return binarySearch(arr, val, mid + 1, end);\r\n  return mid;\r\n};",
-          "es5": "\"use strict\";\n\nvar binarySearch = function binarySearch(arr, val) {\n  var start = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;\n  var end = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : arr.length - 1;\n  if (start > end) return -1;\n  var mid = Math.floor((start + end) / 2);\n  if (arr[mid] > val) return binarySearch(arr, val, start, mid - 1);\n  if (arr[mid] < val) return binarySearch(arr, val, mid + 1, end);\n  return mid;\n};",
+          "es5": "var binarySearch = function binarySearch(arr, val) {\n  var start = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;\n  var end = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : arr.length - 1;\n  if (start > end) return -1;\n  var mid = Math.floor((start + end) / 2);\n  if (arr[mid] > val) return binarySearch(arr, val, start, mid - 1);\n  if (arr[mid] < val) return binarySearch(arr, val, mid + 1, end);\n  return mid;\n};",
           "example": "binarySearch([1, 4, 6, 7, 12, 13, 15, 18, 19, 20, 22, 24], 6); // 2\r\nbinarySearch([1, 4, 6, 7, 12, 13, 15, 18, 19, 20, 22, 24], 21); // -1"
         },
         "tags": []
@@ -7337,7 +7337,7 @@
         "text": "Celsius to Fahrenheit temperature conversion.\r\n\r\nFollows the conversion formula `F =  1.8C + 32`.",
         "codeBlocks": {
           "es6": "const celsiusToFahrenheit = degrees => 1.8 * degrees + 32;",
-          "es5": "\"use strict\";\n\nvar celsiusToFahrenheit = function celsiusToFahrenheit(degrees) {\n  return 1.8 * degrees + 32;\n};",
+          "es5": "var celsiusToFahrenheit = function celsiusToFahrenheit(degrees) {\n  return 1.8 * degrees + 32;\n};",
           "example": "celsiusToFahrenheit(33) // 91.4"
         },
         "tags": []
@@ -7355,7 +7355,7 @@
         "text": "Removes any properties except the ones specified from a JSON object.\r\n\r\nUse `Object.keys()` method to loop over given JSON object and deleting keys that are not included in given array.\r\nIf you pass a special key,`childIndicator`, it will search deeply apply the function to inner objects, too.",
         "codeBlocks": {
           "es6": "const cleanObj = (obj, keysToKeep = [], childIndicator) => {\r\n  Object.keys(obj).forEach(key => {\r\n    if (key === childIndicator) {\r\n      cleanObj(obj[key], keysToKeep, childIndicator);\r\n    } else if (!keysToKeep.includes(key)) {\r\n      delete obj[key];\r\n    }\r\n  });\r\n  return obj;\r\n};",
-          "es5": "\"use strict\";\n\nvar cleanObj = function cleanObj(obj) {\n  var keysToKeep = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];\n  var childIndicator = arguments.length > 2 ? arguments[2] : undefined;\n  Object.keys(obj).forEach(function (key) {\n    if (key === childIndicator) {\n      cleanObj(obj[key], keysToKeep, childIndicator);\n    } else if (!keysToKeep.includes(key)) {\n      delete obj[key];\n    }\n  });\n  return obj;\n};",
+          "es5": "var cleanObj = function cleanObj(obj) {\n  var keysToKeep = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];\n  var childIndicator = arguments.length > 2 ? arguments[2] : undefined;\n  Object.keys(obj).forEach(function (key) {\n    if (key === childIndicator) {\n      cleanObj(obj[key], keysToKeep, childIndicator);\n    } else if (!keysToKeep.includes(key)) {\n      delete obj[key];\n    }\n  });\n  return obj;\n};",
           "example": "const testObj = { a: 1, b: 2, children: { a: 1, b: 2 } };\r\ncleanObj(testObj, ['a'], 'children'); // { a: 1, children : { a: 1}}"
         },
         "tags": []
@@ -7373,7 +7373,7 @@
         "text": "Applies the Collatz algorithm.\r\n\r\nIf `n` is even, return `n/2`. Otherwise, return `3n+1`.",
         "codeBlocks": {
           "es6": "const collatz = n => (n % 2 === 0 ? n / 2 : 3 * n + 1);",
-          "es5": "\"use strict\";\n\nvar collatz = function collatz(n) {\n  return n % 2 === 0 ? n / 2 : 3 * n + 1;\n};",
+          "es5": "var collatz = function collatz(n) {\n  return n % 2 === 0 ? n / 2 : 3 * n + 1;\n};",
           "example": "collatz(8); // 4"
         },
         "tags": []
@@ -7391,7 +7391,7 @@
         "text": "Retuns `number` of vowels in provided string.\r\n\r\nUse a regular expression to count the number of vowels `(A, E, I, O, U)` in a `string`.",
         "codeBlocks": {
           "es6": "const countVowels = str => (str.match(/[aeiou]/gi) || []).length;",
-          "es5": "\"use strict\";\n\nvar countVowels = function countVowels(str) {\n  return (str.match(/[aeiou]/gi) || []).length;\n};",
+          "es5": "var countVowels = function countVowels(str) {\n  return (str.match(/[aeiou]/gi) || []).length;\n};",
           "example": "countVowels('foobar'); // 3\r\ncountVowels('gym'); // 0"
         },
         "tags": []
@@ -7409,7 +7409,7 @@
         "text": "Returns the array of factors of the given `num`.\r\nIf the second argument is set to `true` returns only the prime factors of `num`.\r\nIf `num` is `1` or `0` returns an empty array.\r\nIf `num` is less than `0` returns all the factors of `-int` together with their additive inverses.\r\n\r\nUse `Array.from()`, `Array.prototype.map()` and `Array.prototype.filter()` to find all the factors of `num`.\r\nIf given `num` is negative, use `Array.prototype.reduce()` to add the additive inverses to the array.\r\nReturn all results if `primes` is `false`, else determine and return only the prime factors using `isPrime` and `Array.prototype.filter()`.\r\nOmit the second argument, `primes`, to return prime and non-prime factors by default.\r\n\r\n**Note**:- _Negative numbers are not considered prime._",
         "codeBlocks": {
           "es6": "const factors = (num, primes = false) => {\r\n  const isPrime = num => {\r\n    const boundary = Math.floor(Math.sqrt(num));\r\n    for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;\r\n    return num >= 2;\r\n  };\r\n  const isNeg = num < 0;\r\n  num = isNeg ? -num : num;\r\n  let array = Array.from({ length: num - 1 })\r\n    .map((val, i) => (num % (i + 2) === 0 ? i + 2 : false))\r\n    .filter(val => val);\r\n  if (isNeg)\r\n    array = array.reduce((acc, val) => {\r\n      acc.push(val);\r\n      acc.push(-val);\r\n      return acc;\r\n    }, []);\r\n  return primes ? array.filter(isPrime) : array;\r\n};",
-          "es5": "\"use strict\";\n\nvar factors = function factors(num) {\n  var primes = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var isPrime = function isPrime(num) {\n    var boundary = Math.floor(Math.sqrt(num));\n\n    for (var i = 2; i <= boundary; i++) {\n      if (num % i === 0) return false;\n    }\n\n    return num >= 2;\n  };\n\n  var isNeg = num < 0;\n  num = isNeg ? -num : num;\n  var array = Array.from({\n    length: num - 1\n  }).map(function (val, i) {\n    return num % (i + 2) === 0 ? i + 2 : false;\n  }).filter(function (val) {\n    return val;\n  });\n  if (isNeg) array = array.reduce(function (acc, val) {\n    acc.push(val);\n    acc.push(-val);\n    return acc;\n  }, []);\n  return primes ? array.filter(isPrime) : array;\n};",
+          "es5": "var factors = function factors(num) {\n  var primes = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;\n\n  var isPrime = function isPrime(num) {\n    var boundary = Math.floor(Math.sqrt(num));\n\n    for (var i = 2; i <= boundary; i++) {\n      if (num % i === 0) return false;\n    }\n\n    return num >= 2;\n  };\n\n  var isNeg = num < 0;\n  num = isNeg ? -num : num;\n  var array = Array.from({\n    length: num - 1\n  }).map(function (val, i) {\n    return num % (i + 2) === 0 ? i + 2 : false;\n  }).filter(function (val) {\n    return val;\n  });\n  if (isNeg) array = array.reduce(function (acc, val) {\n    acc.push(val);\n    acc.push(-val);\n    return acc;\n  }, []);\n  return primes ? array.filter(isPrime) : array;\n};",
           "example": "factors(12); // [2,3,4,6,12]\r\nfactors(12, true); // [2,3]\r\nfactors(-12); // [2, -2, 3, -3, 4, -4, 6, -6, 12, -12]\r\nfactors(-12, true); // [2,3]"
         },
         "tags": []
@@ -7427,7 +7427,7 @@
         "text": "Fahrenheit to Celsius temperature conversion.\r\n\r\nFollows the conversion formula `C = (F - 32) * 5/9`.",
         "codeBlocks": {
           "es6": "const fahrenheitToCelsius = degrees => (degrees - 32) * 5/9;",
-          "es5": "\"use strict\";\n\nvar fahrenheitToCelsius = function fahrenheitToCelsius(degrees) {\n  return (degrees - 32) * 5 / 9;\n};",
+          "es5": "var fahrenheitToCelsius = function fahrenheitToCelsius(degrees) {\n  return (degrees - 32) * 5 / 9;\n};",
           "example": "fahrenheitToCelsius(32); // 0"
         },
         "tags": []
@@ -7445,7 +7445,7 @@
         "text": "Returns the number of fibonnacci numbers up to `num`(`0` and `num` inclusive).\r\n\r\nUse a mathematical formula to calculate the number of fibonacci numbers until `num`.",
         "codeBlocks": {
           "es6": "const fibonacciCountUntilNum = num =>\r\n  Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));",
-          "es5": "\"use strict\";\n\nvar fibonacciCountUntilNum = function fibonacciCountUntilNum(num) {\n  return Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));\n};",
+          "es5": "var fibonacciCountUntilNum = function fibonacciCountUntilNum(num) {\n  return Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));\n};",
           "example": "fibonacciCountUntilNum(10); // 7"
         },
         "tags": []
@@ -7463,7 +7463,7 @@
         "text": "Generates an array, containing the Fibonacci sequence, up until the nth term.\r\n\r\nCreate an empty array of the specific length, initializing the first two values (`0` and `1`).\r\nUse `Array.prototype.reduce()` to add values into the array, using the sum of the last two values, except for the first two.\r\nUses a mathematical formula to calculate the length of the array required.",
         "codeBlocks": {
           "es6": "const fibonacciUntilNum = num => {\r\n  let n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));\r\n  return Array.from({ length: n }).reduce(\r\n    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),\r\n    []\r\n  );\r\n};",
-          "es5": "\"use strict\";\n\nvar fibonacciUntilNum = function fibonacciUntilNum(num) {\n  var n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));\n  return Array.from({\n    length: n\n  }).reduce(function (acc, val, i) {\n    return acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i);\n  }, []);\n};",
+          "es5": "var fibonacciUntilNum = function fibonacciUntilNum(num) {\n  var n = Math.ceil(Math.log(num * Math.sqrt(5) + 1 / 2) / Math.log((Math.sqrt(5) + 1) / 2));\n  return Array.from({\n    length: n\n  }).reduce(function (acc, val, i) {\n    return acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i);\n  }, []);\n};",
           "example": "fibonacciUntilNum(10); // [ 0, 1, 1, 2, 3, 5, 8 ]"
         },
         "tags": []
@@ -7481,7 +7481,7 @@
         "text": "Returns the area of a triangle using only the 3 side lengths, Heron's formula. Assumes that the sides define a valid triangle. Does NOT assume it is a right triangle.\r\n\r\nMore information on what Heron's formula is and why it works available here: https://en.wikipedia.org/wiki/Heron%27s_formula.\r\n\r\nUses `Math.sqrt()` to find the square root of a value.",
         "codeBlocks": {
           "es6": "const heronArea = (side_a, side_b, side_c) => {\r\n    const p = (side_a + side_b + side_c) / 2\r\n    return Math.sqrt(p * (p-side_a) * (p-side_b) * (p-side_c))\r\n  };",
-          "es5": "\"use strict\";\n\nvar heronArea = function heronArea(side_a, side_b, side_c) {\n  var p = (side_a + side_b + side_c) / 2;\n  return Math.sqrt(p * (p - side_a) * (p - side_b) * (p - side_c));\n};",
+          "es5": "var heronArea = function heronArea(side_a, side_b, side_c) {\n  var p = (side_a + side_b + side_c) / 2;\n  return Math.sqrt(p * (p - side_a) * (p - side_b) * (p - side_c));\n};",
           "example": "heronArea(3, 4, 5); // 6"
         },
         "tags": []
@@ -7499,7 +7499,7 @@
         "text": "Returns the number of times `num` can be divided by `divisor` (integer or fractional) without getting a fractional answer.\r\nWorks for both negative and positive integers.\r\n\r\nIf `divisor` is `-1` or `1` return `Infinity`.\r\nIf `divisor` is `-0` or `0` return `0`.\r\nOtherwise, keep dividing `num` with `divisor` and incrementing `i`, while the result is an integer.\r\nReturn the number of times the loop was executed, `i`.",
         "codeBlocks": {
           "es6": "const howManyTimes = (num, divisor) => {\r\n  if (divisor === 1 || divisor === -1) return Infinity;\r\n  if (divisor === 0) return 0;\r\n  let i = 0;\r\n  while (Number.isInteger(num / divisor)) {\r\n    i++;\r\n    num = num / divisor;\r\n  }\r\n  return i;\r\n};",
-          "es5": "\"use strict\";\n\nvar howManyTimes = function howManyTimes(num, divisor) {\n  if (divisor === 1 || divisor === -1) return Infinity;\n  if (divisor === 0) return 0;\n  var i = 0;\n\n  while (Number.isInteger(num / divisor)) {\n    i++;\n    num = num / divisor;\n  }\n\n  return i;\n};",
+          "es5": "var howManyTimes = function howManyTimes(num, divisor) {\n  if (divisor === 1 || divisor === -1) return Infinity;\n  if (divisor === 0) return 0;\n  var i = 0;\n\n  while (Number.isInteger(num / divisor)) {\n    i++;\n    num = num / divisor;\n  }\n\n  return i;\n};",
           "example": "howManyTimes(100, 2); // 2\r\nhowManyTimes(100, 2.5); // 2\r\nhowManyTimes(100, 0); // 0\r\nhowManyTimes(100, -1); // Infinity"
         },
         "tags": []
@@ -7517,7 +7517,7 @@
         "text": "Makes a `DELETE` request to the passed URL.\r\n\r\nUse `XMLHttpRequest` web api to make a `delete` request to the given `url`.\r\nHandle the `onload` event, by running the provided `callback` function.\r\nHandle the `onerror` event, by running the provided `err` function.\r\nOmit the third argument, `err` to log the request to the console's error stream by default.",
         "codeBlocks": {
           "es6": "const httpDelete = (url, callback, err = console.error) => {\r\n  const request = new XMLHttpRequest();\r\n  request.open('DELETE', url, true);\r\n  request.onload = () => callback(request);\r\n  request.onerror = () => err(request);\r\n  request.send();\r\n};",
-          "es5": "\"use strict\";\n\nvar httpDelete = function httpDelete(url, callback) {\n  var err = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('DELETE', url, true);\n\n  request.onload = function () {\n    return callback(request);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send();\n};",
+          "es5": "var httpDelete = function httpDelete(url, callback) {\n  var err = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : console.error;\n  var request = new XMLHttpRequest();\n  request.open('DELETE', url, true);\n\n  request.onload = function () {\n    return callback(request);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send();\n};",
           "example": "httpDelete('https://website.com/users/123', request => {\r\n  console.log(request.responseText);\r\n}); // 'Deletes a user from the database'"
         },
         "tags": []
@@ -7535,7 +7535,7 @@
         "text": "Makes a `PUT` request to the passed URL.\r\n\r\nUse `XMLHttpRequest` web api to make a `put` request to the given `url`.\r\nSet the value of an `HTTP` request header with `setRequestHeader` method.\r\nHandle the `onload` event, by running the provided `callback` function.\r\nHandle the `onerror` event, by running the provided `err` function.\r\nOmit the last argument, `err` to log the request to the console's error stream by default.",
         "codeBlocks": {
           "es6": "const httpPut = (url, data, callback, err = console.error) => {\r\n  const request = new XMLHttpRequest();\r\n  request.open(\"PUT\", url, true);\r\n  request.setRequestHeader('Content-type','application/json; charset=utf-8');\r\n  request.onload = () => callback(request);\r\n  request.onerror = () => err(request);\r\n  request.send(data);\r\n};",
-          "es5": "\"use strict\";\n\nvar httpPut = function httpPut(url, data, callback) {\n  var err = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : console.error;\n  var request = new XMLHttpRequest();\n  request.open(\"PUT\", url, true);\n  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');\n\n  request.onload = function () {\n    return callback(request);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send(data);\n};",
+          "es5": "var httpPut = function httpPut(url, data, callback) {\n  var err = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : console.error;\n  var request = new XMLHttpRequest();\n  request.open(\"PUT\", url, true);\n  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');\n\n  request.onload = function () {\n    return callback(request);\n  };\n\n  request.onerror = function () {\n    return err(request);\n  };\n\n  request.send(data);\n};",
           "example": "const password = \"fooBaz\";\r\nconst data = JSON.stringify(password);\r\nhttpPut('https://website.com/users/123', data, request => {\r\n  console.log(request.responseText);\r\n}); // 'Updates a user's password in database'"
         },
         "tags": []
@@ -7553,7 +7553,7 @@
         "text": "Checks if the given number is an Armstrong number or not.\r\n\r\nConvert the given number into an array of digits. Use the exponent operator (`**`) to get the appropriate power for each digit and sum them up. If the sum is equal to the number itself, return `true` otherwise `false`.",
         "codeBlocks": {
           "es6": "const isArmstrongNumber = digits =>\r\n  (arr => arr.reduce((a, d) => a + parseInt(d) ** arr.length, 0) == digits)(\r\n    (digits + '').split('')\r\n  );",
-          "es5": "\"use strict\";\n\nvar isArmstrongNumber = function isArmstrongNumber(digits) {\n  return function (arr) {\n    return arr.reduce(function (a, d) {\n      return a + Math.pow(parseInt(d), arr.length);\n    }, 0) == digits;\n  }((digits + '').split(''));\n};",
+          "es5": "var isArmstrongNumber = function isArmstrongNumber(digits) {\n  return function (arr) {\n    return arr.reduce(function (a, d) {\n      return a + Math.pow(parseInt(d), arr.length);\n    }, 0) == digits;\n  }((digits + '').split(''));\n};",
           "example": "isArmstrongNumber(1634); // true\r\nisArmstrongNumber(56); // false"
         },
         "tags": []
@@ -7571,7 +7571,7 @@
         "text": "Determines if the `pattern` matches with `str`.\r\n\r\nUse `String.toLowerCase()` to convert both strings to lowercase, then loop through `str` and determine if it contains all characters of `pattern` and in the correct order.\r\nAdapted from [here](https://github.com/forrestthewoods/lib_fts/blob/80f3f8c52db53428247e741b9efe2cde9667050c/code/fts_fuzzy_match.js#L18).",
         "codeBlocks": {
           "es6": "const isSimilar = (pattern, str) =>\r\n  [...str].reduce(\r\n      (matchIndex, char) =>\r\n          char.toLowerCase() === (pattern[matchIndex] || '').toLowerCase()\r\n              ? matchIndex + 1\r\n              : matchIndex,\r\n      0\r\n  ) === pattern.length;",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar isSimilar = function isSimilar(pattern, str) {\n  return _toConsumableArray(str).reduce(function (matchIndex, char) {\n    return char.toLowerCase() === (pattern[matchIndex] || '').toLowerCase() ? matchIndex + 1 : matchIndex;\n  }, 0) === pattern.length;\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nvar isSimilar = function isSimilar(pattern, str) {\n  return _toConsumableArray(str).reduce(function (matchIndex, char) {\n    return char.toLowerCase() === (pattern[matchIndex] || '').toLowerCase() ? matchIndex + 1 : matchIndex;\n  }, 0) === pattern.length;\n};",
           "example": "isSimilar('rt','Rohit'); // true\r\nisSimilar('tr','Rohit'); // false"
         },
         "tags": []
@@ -7589,7 +7589,7 @@
         "text": "Converts a JSON object to a date.\r\n\r\nUse `Date()`, to convert dates in JSON format to readable format (`dd/mm/yyyy`).",
         "codeBlocks": {
           "es6": "const JSONToDate = arr => {\r\n  const dt = new Date(parseInt(arr.toString().substr(6)));\r\n  return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;\r\n};",
-          "es5": "\"use strict\";\n\nvar JSONToDate = function JSONToDate(arr) {\n  var dt = new Date(parseInt(arr.toString().substr(6)));\n  return \"\".concat(dt.getDate(), \"/\").concat(dt.getMonth() + 1, \"/\").concat(dt.getFullYear());\n};",
+          "es5": "var JSONToDate = function JSONToDate(arr) {\n  var dt = new Date(parseInt(arr.toString().substr(6)));\n  return \"\".concat(dt.getDate(), \"/\").concat(dt.getMonth() + 1, \"/\").concat(dt.getFullYear());\n};",
           "example": "JSONToDate(/Date(1489525200000)/); // \"14/3/2017\""
         },
         "tags": []
@@ -7607,7 +7607,7 @@
         "text": "Convert kilometers/hour to miles/hour.\r\n\r\nMultiply the constant of proportionality with the argument.",
         "codeBlocks": {
           "es6": "const kmphToMph = (kmph) => 0.621371192 * kmph;",
-          "es5": "\"use strict\";\n\nvar kmphToMph = function kmphToMph(kmph) {\n  return 0.621371192 * kmph;\n};",
+          "es5": "var kmphToMph = function kmphToMph(kmph) {\n  return 0.621371192 * kmph;\n};",
           "example": "kmphToMph(10); // 16.09344000614692\r\nkmphToMph(345.4); // 138.24264965280207"
         },
         "tags": []
@@ -7625,7 +7625,7 @@
         "text": "Calculates the [Levenshtein distance](https://en.wikipedia.org/wiki/Levenshtein_distance) between two strings.\r\n\r\nCalculates the number of changes (substitutions, deletions or additions) required to convert `string1` to `string2`. \r\nCan also be used to compare two strings as shown in the second example.",
         "codeBlocks": {
           "es6": "``` js\r\nconst levenshteinDistance = (string1, string2) => {\r\n  if (string1.length === 0) return string2.length;\r\n  if (string2.length === 0) return string1.length;\r\n  let matrix = Array(string2.length + 1)\r\n    .fill(0)\r\n    .map((x, i) => [i]);\r\n  matrix[0] = Array(string1.length + 1)\r\n    .fill(0)\r\n    .map((x, i) => i);\r\n  for (let i = 1; i <= string2.length; i++) {\r\n    for (let j = 1; j <= string1.length; j++) {\r\n      if (string2[i - 1] === string1[j - 1]) {\r\n        matrix[i][j] = matrix[i - 1][j - 1];\r\n      } else {\r\n        matrix[i][j] = Math.min(\r\n          matrix[i - 1][j - 1] + 1,\r\n          matrix[i][j - 1] + 1,\r\n          matrix[i - 1][j] + 1\r\n        );\r\n      }\r\n    }\r\n  }\r\n  return matrix[string2.length][string1.length];\r\n};\r\n```",
-          "es5": "\"use strict\";\n\nfunction _templateObject2() {\n  var data = _taggedTemplateLiteral([\" js\\nconst levenshteinDistance = (string1, string2) => {\\n  if (string1.length === 0) return string2.length;\\n  if (string2.length === 0) return string1.length;\\n  let matrix = Array(string2.length + 1)\\n    .fill(0)\\n    .map((x, i) => [i]);\\n  matrix[0] = Array(string1.length + 1)\\n    .fill(0)\\n    .map((x, i) => i);\\n  for (let i = 1; i <= string2.length; i++) {\\n    for (let j = 1; j <= string1.length; j++) {\\n      if (string2[i - 1] === string1[j - 1]) {\\n        matrix[i][j] = matrix[i - 1][j - 1];\\n      } else {\\n        matrix[i][j] = Math.min(\\n          matrix[i - 1][j - 1] + 1,\\n          matrix[i][j - 1] + 1,\\n          matrix[i - 1][j] + 1\\n        );\\n      }\\n    }\\n  }\\n  return matrix[string2.length][string1.length];\\n};\\n\"]);\n\n  _templateObject2 = function _templateObject2() {\n    return data;\n  };\n\n  return data;\n}\n\nfunction _templateObject() {\n  var data = _taggedTemplateLiteral([\"\"]);\n\n  _templateObject = function _templateObject() {\n    return data;\n  };\n\n  return data;\n}\n\nfunction _taggedTemplateLiteral(strings, raw) { if (!raw) { raw = strings.slice(0); } return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }\n\n\"\"(_templateObject2())(_templateObject());",
+          "es5": "function _templateObject2() {\n  var data = _taggedTemplateLiteral([\" js\\nconst levenshteinDistance = (string1, string2) => {\\n  if (string1.length === 0) return string2.length;\\n  if (string2.length === 0) return string1.length;\\n  let matrix = Array(string2.length + 1)\\n    .fill(0)\\n    .map((x, i) => [i]);\\n  matrix[0] = Array(string1.length + 1)\\n    .fill(0)\\n    .map((x, i) => i);\\n  for (let i = 1; i <= string2.length; i++) {\\n    for (let j = 1; j <= string1.length; j++) {\\n      if (string2[i - 1] === string1[j - 1]) {\\n        matrix[i][j] = matrix[i - 1][j - 1];\\n      } else {\\n        matrix[i][j] = Math.min(\\n          matrix[i - 1][j - 1] + 1,\\n          matrix[i][j - 1] + 1,\\n          matrix[i - 1][j] + 1\\n        );\\n      }\\n    }\\n  }\\n  return matrix[string2.length][string1.length];\\n};\\n\"]);\n\n  _templateObject2 = function _templateObject2() {\n    return data;\n  };\n\n  return data;\n}\n\nfunction _templateObject() {\n  var data = _taggedTemplateLiteral([\"\"]);\n\n  _templateObject = function _templateObject() {\n    return data;\n  };\n\n  return data;\n}\n\nfunction _taggedTemplateLiteral(strings, raw) { if (!raw) { raw = strings.slice(0); } return Object.freeze(Object.defineProperties(strings, { raw: { value: Object.freeze(raw) } })); }\n\n\"\"(_templateObject2())(_templateObject());",
           "example": "levenshteinDistance('30-seconds-of-code','30-seconds-of-python-code'); // 7\r\nconst compareStrings = (string1,string2) => (100 - levenshteinDistance(string1,string2) / Math.max(string1.length,string2.length));\r\ncompareStrings('30-seconds-of-code', '30-seconds-of-python-code'); // 99.72 (%)"
         },
         "tags": []
@@ -7643,7 +7643,7 @@
         "text": "Convert miles/hour to kilometers/hour.\r\n\r\nMultiply the constant of proportionality with the argument.",
         "codeBlocks": {
           "es6": "const mphToKmph = (mph) => 1.6093440006146922 * mph;",
-          "es5": "\"use strict\";\n\nvar mphToKmph = function mphToKmph(mph) {\n  return 1.6093440006146922 * mph;\n};",
+          "es5": "var mphToKmph = function mphToKmph(mph) {\n  return 1.6093440006146922 * mph;\n};",
           "example": "mphToKmph(10); // 16.09344000614692\r\nmphToKmph(85.9); // 138.24264965280207"
         },
         "tags": []
@@ -7661,7 +7661,7 @@
         "text": "Logs a value and returns it.\r\n\r\nUse `console.log` to log the supplied value, combined with the `||` operator to return it.",
         "codeBlocks": {
           "es6": "const pipeLog = data => console.log(data) || data;",
-          "es5": "\"use strict\";\n\nvar pipeLog = function pipeLog(data) {\n  return console.log(data) || data;\n};",
+          "es5": "var pipeLog = function pipeLog(data) {\n  return console.log(data) || data;\n};",
           "example": "pipeLog(1); // logs `1` and returns `1`"
         },
         "tags": []
@@ -7679,7 +7679,7 @@
         "text": "QuickSort an Array (ascending sort by default).\r\n\r\nUse recursion.\r\nUse `Array.prototype.filter` and spread operator (`...`) to create an array that all elements with values less than the pivot come before the pivot, and all elements with values greater than the pivot come after it.\r\nIf the parameter `desc` is truthy, return array sorts in descending order.",
         "codeBlocks": {
           "es6": "const quickSort = ([n, ...nums], desc) =>\r\n  isNaN(n)\r\n    ? []\r\n    : [\r\n        ...quickSort(nums.filter(v => (desc ? v > n : v <= n)), desc),\r\n        n,\r\n        ...quickSort(nums.filter(v => (!desc ? v > n : v <= n)), desc)\r\n      ];",
-          "es5": "\"use strict\";\n\nfunction _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar quickSort = function quickSort(_ref, desc) {\n  var _ref2 = _toArray(_ref),\n      n = _ref2[0],\n      nums = _ref2.slice(1);\n\n  return isNaN(n) ? [] : _toConsumableArray(quickSort(nums.filter(function (v) {\n    return desc ? v > n : v <= n;\n  }), desc)).concat([n], _toConsumableArray(quickSort(nums.filter(function (v) {\n    return !desc ? v > n : v <= n;\n  }), desc)));\n};",
+          "es5": "function _toConsumableArray(arr) { return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _nonIterableSpread(); }\n\nfunction _nonIterableSpread() { throw new TypeError(\"Invalid attempt to spread non-iterable instance\"); }\n\nfunction _arrayWithoutHoles(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = new Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } }\n\nfunction _toArray(arr) { return _arrayWithHoles(arr) || _iterableToArray(arr) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance\"); }\n\nfunction _iterableToArray(iter) { if (Symbol.iterator in Object(iter) || Object.prototype.toString.call(iter) === \"[object Arguments]\") return Array.from(iter); }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nvar quickSort = function quickSort(_ref, desc) {\n  var _ref2 = _toArray(_ref),\n      n = _ref2[0],\n      nums = _ref2.slice(1);\n\n  return isNaN(n) ? [] : _toConsumableArray(quickSort(nums.filter(function (v) {\n    return desc ? v > n : v <= n;\n  }), desc)).concat([n], _toConsumableArray(quickSort(nums.filter(function (v) {\n    return !desc ? v > n : v <= n;\n  }), desc)));\n};",
           "example": "quickSort([4, 1, 3, 2]); // [1,2,3,4]\r\nquickSort([4, 1, 3, 2], true); // [4,3,2,1]"
         },
         "tags": []
@@ -7697,7 +7697,7 @@
         "text": "Converts a JSON object to a date.\r\n\r\nUse `Date()`, to convert dates in JSON format to readable format (`dd/mm/yyyy`).",
         "codeBlocks": {
           "es6": "const JSONToDate = arr => {\r\n  const dt = new Date(parseInt(arr.toString().substr(6)));\r\n  return `${dt.getDate()}/${dt.getMonth() + 1}/${dt.getFullYear()}`;\r\n};",
-          "es5": "\"use strict\";\n\nvar JSONToDate = function JSONToDate(arr) {\n  var dt = new Date(parseInt(arr.toString().substr(6)));\n  return \"\".concat(dt.getDate(), \"/\").concat(dt.getMonth() + 1, \"/\").concat(dt.getFullYear());\n};",
+          "es5": "var JSONToDate = function JSONToDate(arr) {\n  var dt = new Date(parseInt(arr.toString().substr(6)));\n  return \"\".concat(dt.getDate(), \"/\").concat(dt.getMonth() + 1, \"/\").concat(dt.getFullYear());\n};",
           "example": "JSONToDate(/Date(1489525200000)/); // \"14/3/2017\""
         },
         "tags": []
@@ -7715,7 +7715,7 @@
         "text": "Returns all the vowels in a `str` replaced by `repl`.\r\n\r\nUse `String.prototype.replace()` with a regexp to replace all vowels in `str`.\r\nOmot `repl` to use a default value of `''`.",
         "codeBlocks": {
           "es6": "const removeVowels = (str, repl = '') => str.replace(/[aeiou]/gi, repl);",
-          "es5": "\"use strict\";\n\nvar removeVowels = function removeVowels(str) {\n  var repl = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';\n  return str.replace(/[aeiou]/gi, repl);\n};",
+          "es5": "var removeVowels = function removeVowels(str) {\n  var repl = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : '';\n  return str.replace(/[aeiou]/gi, repl);\n};",
           "example": "removeVowels(\"foobAr\"); // \"fbr\"\r\nremoveVowels(\"foobAr\",\"*\"); // \"f**b*r\""
         },
         "tags": []
@@ -7733,7 +7733,7 @@
         "text": "Solves the given mathematical expression in [reverse polish notation](https://en.wikipedia.org/wiki/Reverse_Polish_notation).\r\nThrows appropriate errors if there are unrecognized symbols or the expression is wrong. The valid operators are :- `+`,`-`,`*`,`/`,`^`,`**` (`^`&`**` are the exponential symbols and are same). This snippet does not supports any unary operators.\r\n\r\nUse a dictionary, `OPERATORS` to specify each operator's matching mathematical operation.\r\nUse `String.prototype.replace()` with a regular expression to replace `^` with `**`, `String.prototype.split()` to tokenize the string and `Array.prototype.filter()` to remove empty tokens.\r\nUse `Array.prototype.forEach()` to parse each `symbol`, evaluate it as a numeric value or operator and solve the mathematical expression.\r\nNumeric values are converted to floating point numbers and pushed to a `stack`, while operators are evaluated using the `OPERATORS` dictionary and pop elements from the `stack` to apply operations.",
         "codeBlocks": {
           "es6": "const solveRPN = rpn => {\r\n  const OPERATORS = {\r\n    '*': (a, b) => a * b,\r\n    '+': (a, b) => a + b,\r\n    '-': (a, b) => a - b,\r\n    '/': (a, b) => a / b,\r\n    '**': (a, b) => a ** b\r\n  };\r\n  const [stack, solve] = [\r\n    [],\r\n    rpn\r\n      .replace(/\\^/g, '**')\r\n      .split(/\\s+/g)\r\n      .filter(el => !/\\s+/.test(el) && el !== '')\r\n  ];\r\n  solve.forEach(symbol => {\r\n    if (!isNaN(parseFloat(symbol)) && isFinite(symbol)) {\r\n      stack.push(symbol);\r\n    } else if (Object.keys(OPERATORS).includes(symbol)) {\r\n      const [a, b] = [stack.pop(), stack.pop()];\r\n      stack.push(OPERATORS[symbol](parseFloat(b), parseFloat(a)));\r\n    } else {\r\n      throw `${symbol} is not a recognized symbol`;\r\n    }\r\n  });\r\n  if (stack.length === 1) return stack.pop();\r\n  else throw `${rpn} is not a proper RPN. Please check it and try again`;\r\n};",
-          "es5": "\"use strict\";\n\nvar solveRPN = function solveRPN(rpn) {\n  var OPERATORS = {\n    '*': function _(a, b) {\n      return a * b;\n    },\n    '+': function _(a, b) {\n      return a + b;\n    },\n    '-': function _(a, b) {\n      return a - b;\n    },\n    '/': function _(a, b) {\n      return a / b;\n    },\n    '**': function _(a, b) {\n      return Math.pow(a, b);\n    }\n  };\n  var _ref = [[], rpn.replace(/\\^/g, '**').split(/\\s+/g).filter(function (el) {\n    return !/\\s+/.test(el) && el !== '';\n  })],\n      stack = _ref[0],\n      solve = _ref[1];\n  solve.forEach(function (symbol) {\n    if (!isNaN(parseFloat(symbol)) && isFinite(symbol)) {\n      stack.push(symbol);\n    } else if (Object.keys(OPERATORS).includes(symbol)) {\n      var _ref2 = [stack.pop(), stack.pop()],\n          a = _ref2[0],\n          b = _ref2[1];\n      stack.push(OPERATORS[symbol](parseFloat(b), parseFloat(a)));\n    } else {\n      throw \"\".concat(symbol, \" is not a recognized symbol\");\n    }\n  });\n  if (stack.length === 1) return stack.pop();else throw \"\".concat(rpn, \" is not a proper RPN. Please check it and try again\");\n};",
+          "es5": "var solveRPN = function solveRPN(rpn) {\n  var OPERATORS = {\n    '*': function _(a, b) {\n      return a * b;\n    },\n    '+': function _(a, b) {\n      return a + b;\n    },\n    '-': function _(a, b) {\n      return a - b;\n    },\n    '/': function _(a, b) {\n      return a / b;\n    },\n    '**': function _(a, b) {\n      return Math.pow(a, b);\n    }\n  };\n  var _ref = [[], rpn.replace(/\\^/g, '**').split(/\\s+/g).filter(function (el) {\n    return !/\\s+/.test(el) && el !== '';\n  })],\n      stack = _ref[0],\n      solve = _ref[1];\n  solve.forEach(function (symbol) {\n    if (!isNaN(parseFloat(symbol)) && isFinite(symbol)) {\n      stack.push(symbol);\n    } else if (Object.keys(OPERATORS).includes(symbol)) {\n      var _ref2 = [stack.pop(), stack.pop()],\n          a = _ref2[0],\n          b = _ref2[1];\n      stack.push(OPERATORS[symbol](parseFloat(b), parseFloat(a)));\n    } else {\n      throw \"\".concat(symbol, \" is not a recognized symbol\");\n    }\n  });\n  if (stack.length === 1) return stack.pop();else throw \"\".concat(rpn, \" is not a proper RPN. Please check it and try again\");\n};",
           "example": "solveRPN('15 7 1 1 + - / 3 * 2 1 1 + + -'); // 5\r\nsolveRPN('2 3 ^'); // 8"
         },
         "tags": []
@@ -7751,7 +7751,7 @@
         "text": "Performs speech synthesis (experimental).\r\n\r\nUse `SpeechSynthesisUtterance.voice` and `window.speechSynthesis.getVoices()` to convert a message to speech.\r\nUse `window.speechSynthesis.speak()` to play the message.\r\n\r\nLearn more about the [SpeechSynthesisUtterance interface of the Web Speech API](https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesisUtterance).",
         "codeBlocks": {
           "es6": "const speechSynthesis = message => {\r\n  const msg = new SpeechSynthesisUtterance(message);\r\n  msg.voice = window.speechSynthesis.getVoices()[0];\r\n  window.speechSynthesis.speak(msg);\r\n};",
-          "es5": "\"use strict\";\n\nvar speechSynthesis = function speechSynthesis(message) {\n  var msg = new SpeechSynthesisUtterance(message);\n  msg.voice = window.speechSynthesis.getVoices()[0];\n  window.speechSynthesis.speak(msg);\n};",
+          "es5": "var speechSynthesis = function speechSynthesis(message) {\n  var msg = new SpeechSynthesisUtterance(message);\n  msg.voice = window.speechSynthesis.getVoices()[0];\n  window.speechSynthesis.speak(msg);\n};",
           "example": "speechSynthesis('Hello, World'); // // plays the message"
         },
         "tags": []
@@ -7769,7 +7769,7 @@
         "text": "Squares each number in an array and then sums the results together.\r\n\r\nUse `Array.prototype.reduce()` in combination with `Math.pow()` to iterate over numbers and sum their squares into an accumulator.",
         "codeBlocks": {
           "es6": "const squareSum = (...args) => args.reduce((squareSum, number) => squareSum + Math.pow(number, 2), 0);",
-          "es5": "\"use strict\";\n\nvar squareSum = function squareSum() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.reduce(function (squareSum, number) {\n    return squareSum + Math.pow(number, 2);\n  }, 0);\n};",
+          "es5": "var squareSum = function squareSum() {\n  for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {\n    args[_key] = arguments[_key];\n  }\n\n  return args.reduce(function (squareSum, number) {\n    return squareSum + Math.pow(number, 2);\n  }, 0);\n};",
           "example": "squareSum(1, 2, 2); // 9"
         },
         "tags": []
diff --git a/static-parts/README-end.md b/static-parts/README-end.md
index e4030fe3a..445b4cf2e 100644
--- a/static-parts/README-end.md
+++ b/static-parts/README-end.md
@@ -7,4 +7,5 @@
 
 ## Credits
 
+*Logos made by [Angelos Chalaris](https://github.com/Chalarangelo) are licensed under the [MIT](https://opensource.org/licenses/MIT) license.*
 *This README is built using [markdown-builder](https://github.com/30-seconds/markdown-builder).*
diff --git a/static-parts/README-start.md b/static-parts/README-start.md
index b95bac6b9..4e3e75811 100644
--- a/static-parts/README-start.md
+++ b/static-parts/README-start.md
@@ -11,8 +11,7 @@
 * Use <kbd>Ctrl</kbd> + <kbd>F</kbd> or <kbd>command</kbd> + <kbd>F</kbd> to search for a snippet.
 * Contributions welcome, please read the [contribution guide](CONTRIBUTING.md).
 * Snippets are written in ES6, use the [Babel transpiler](https://babeljs.io/) to ensure backwards-compatibility.
-* You can import these snippets into your text editor of choice (VSCode, Atom, Sublime), using the files found in [this repo](https://github.com/Rob-Rychs/30-seconds-of-code-texteditorsnippets).
-* You can import these snippets into Alfred 3, using [this file](https://github.com/lslvxy/30-seconds-of-code-alfredsnippets).
+* You can import these snippets into VSCode, by following the instruction found [here](https://github.com/30-seconds/30-seconds-of-code/tree/master/vscode_snippets).
 * You can search, view and copy these snippets from a terminal, using the CLI application from [this repo](https://github.com/sQVe/30s).
 * If you want to follow 30-seconds-of-code on social media, you can find us on [Facebook](https://www.facebook.com/30secondsofcode), [Instagram](https://www.instagram.com/30secondsofcode) and [Twitter](https://twitter.com/30secondsofcode).
 
@@ -38,10 +37,7 @@ npm install 30-seconds-of-code
 yarn add 30-seconds-of-code
 ```
 
-CDN links
-
-* [ES2017 Full (UMD)](https://unpkg.com/30-seconds-of-code)
-* [ES5 Minified (UMD)](https://unpkg.com/30-seconds-of-code/dist/_30s.es5.min.js)
+[CDN link](https://unpkg.com/30-seconds-of-code/)
 
 <details>
 <summary>Details</summary>
diff --git a/vscode_snippets/README.md b/vscode_snippets/README.md
new file mode 100644
index 000000000..3827a0f2c
--- /dev/null
+++ b/vscode_snippets/README.md
@@ -0,0 +1,7 @@
+# Importing 30-seconds-of-code snippets to VSCode
+
+1. Open Visual Studio Code.
+2. Use <kbd>Ctrl</kbd> + <kbd>Shift</kbd> + <kbd>P</kbd> or <kbd>command</kbd> + <kbd>Shift</kbd> + <kbd>P</kbd> to open the Command Palette.
+3. Search for `Preferences: Configure User Snippets` and then `New Global Snippets file...`.
+4. Select a name and save in the default snippets directory.
+5. Copy and paste the content of `snippets.json` from the `vscode_snippets` folder to the file you previously created.
\ No newline at end of file
diff --git a/vscode_snippets/snippets.json b/vscode_snippets/snippets.json
new file mode 100644
index 000000000..c03844454
--- /dev/null
+++ b/vscode_snippets/snippets.json
@@ -0,0 +1,3334 @@
+{
+  "all": {
+    "prefix": "30s_all",
+    "body": [
+      "const all = (arr, fn = Boolean) => arr.every(fn);"
+    ],
+    "description": "Returns `true` if the provided predicate function returns `true` for all elements in a collection, `false` otherwise."
+  },
+  "allEqual": {
+    "prefix": "30s_allEqual",
+    "body": [
+      "const allEqual = arr => arr.every(val => val === arr[0]);"
+    ],
+    "description": "Check if all elements in an array are equal."
+  },
+  "any": {
+    "prefix": "30s_any",
+    "body": [
+      "const any = (arr, fn = Boolean) => arr.some(fn);"
+    ],
+    "description": "Returns `true` if the provided predicate function returns `true` for at least one element in a collection, `false` otherwise."
+  },
+  "approximatelyEqual": {
+    "prefix": "30s_approximatelyEqual",
+    "body": [
+      "const approximatelyEqual = (v1, v2, epsilon = 0.001) => Math.abs(v1 - v2) < epsilon;"
+    ],
+    "description": "Checks if two numbers are approximately equal to each other."
+  },
+  "arrayToCSV": {
+    "prefix": "30s_arrayToCSV",
+    "body": [
+      "const arrayToCSV = (arr, delimiter = ',') =>",
+      "  arr.map(v => v.map(x => `\"${x}\"`).join(delimiter)).join('\\n');"
+    ],
+    "description": "Converts a 2D array to a comma-separated values (CSV) string."
+  },
+  "arrayToHtmlList": {
+    "prefix": "30s_arrayToHtmlList",
+    "body": [
+      "const arrayToHtmlList = (arr, listID) =>",
+      "  (el => (",
+      "    (el = document.querySelector('#' + listID)),",
+      "    (el.innerHTML += arr.map(item => `<li>${item}</li>`).join(''))",
+      "  ))();"
+    ],
+    "description": "Converts the given array elements into `<li>` tags and appends them to the list of the given id."
+  },
+  "ary": {
+    "prefix": "30s_ary",
+    "body": [
+      "const ary = (fn, n) => (...args) => fn(...args.slice(0, n));"
+    ],
+    "description": "Creates a function that accepts up to `n` arguments, ignoring any additional arguments."
+  },
+  "atob": {
+    "prefix": "30s_atob",
+    "body": [
+      "const atob = str => Buffer.from(str, 'base64').toString('binary');"
+    ],
+    "description": "Decodes a string of data which has been encoded using base-64 encoding."
+  },
+  "attempt": {
+    "prefix": "30s_attempt",
+    "body": [
+      "const attempt = (fn, ...args) => {",
+      "  try {",
+      "    return fn(...args);",
+      "  } catch (e) {",
+      "    return e instanceof Error ? e : new Error(e);",
+      "  }",
+      "};"
+    ],
+    "description": "Attempts to invoke a function with the provided arguments, returning either the result or the caught error object."
+  },
+  "average": {
+    "prefix": "30s_average",
+    "body": [
+      "const average = (...nums) => nums.reduce((acc, val) => acc + val, 0) / nums.length;"
+    ],
+    "description": "Returns the average of two or more numbers."
+  },
+  "averageBy": {
+    "prefix": "30s_averageBy",
+    "body": [
+      "const averageBy = (arr, fn) =>",
+      "  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0) /",
+      "  arr.length;"
+    ],
+    "description": "Returns the average of an array, after mapping each element to a value using the provided function."
+  },
+  "bifurcate": {
+    "prefix": "30s_bifurcate",
+    "body": [
+      "const bifurcate = (arr, filter) =>",
+      "  arr.reduce((acc, val, i) => (acc[filter[i] ? 0 : 1].push(val), acc), [[], []]);"
+    ],
+    "description": "Splits values into two groups. If an element in `filter` is truthy, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group."
+  },
+  "bifurcateBy": {
+    "prefix": "30s_bifurcateBy",
+    "body": [
+      "const bifurcateBy = (arr, fn) =>",
+      "  arr.reduce((acc, val, i) => (acc[fn(val, i) ? 0 : 1].push(val), acc), [[], []]);"
+    ],
+    "description": "Splits values into two groups according to a predicate function, which specifies which group an element in the input collection belongs to. If the predicate function returns a truthy value, the collection element belongs to the first group; otherwise, it belongs to the second group."
+  },
+  "bind": {
+    "prefix": "30s_bind",
+    "body": [
+      "const bind = (fn, context, ...boundArgs) => (...args) => fn.apply(context, [...boundArgs, ...args]);"
+    ],
+    "description": "Creates a function that invokes `fn` with a given context, optionally adding any additional supplied parameters to the beginning of the arguments."
+  },
+  "bindAll": {
+    "prefix": "30s_bindAll",
+    "body": [
+      "const bindAll = (obj, ...fns) =>",
+      "  fns.forEach(",
+      "    fn => (",
+      "      (f = obj[fn]),",
+      "      (obj[fn] = function() {",
+      "        return f.apply(obj);",
+      "      })",
+      "    )",
+      "  );"
+    ],
+    "description": "Binds methods of an object to the object itself, overwriting the existing method."
+  },
+  "bindKey": {
+    "prefix": "30s_bindKey",
+    "body": [
+      "const bindKey = (context, fn, ...boundArgs) => (...args) =>",
+      "  context[fn].apply(context, [...boundArgs, ...args]);"
+    ],
+    "description": "Creates a function that invokes the method at a given key of an object, optionally adding any additional supplied parameters to the beginning of the arguments."
+  },
+  "binomialCoefficient": {
+    "prefix": "30s_binomialCoefficient",
+    "body": [
+      "const binomialCoefficient = (n, k) => {",
+      "  if (Number.isNaN(n) || Number.isNaN(k)) return NaN;",
+      "  if (k < 0 || k > n) return 0;",
+      "  if (k === 0 || k === n) return 1;",
+      "  if (k === 1 || k === n - 1) return n;",
+      "  if (n - k < k) k = n - k;",
+      "  let res = n;",
+      "  for (let j = 2; j <= k; j++) res *= (n - j + 1) / j;",
+      "  return Math.round(res);",
+      "};"
+    ],
+    "description": "Evaluates the binomial coefficient of two integers `n` and `k`."
+  },
+  "bottomVisible": {
+    "prefix": "30s_bottomVisible",
+    "body": [
+      "const bottomVisible = () =>",
+      "  document.documentElement.clientHeight + window.scrollY >=",
+      "  (document.documentElement.scrollHeight || document.documentElement.clientHeight);"
+    ],
+    "description": "Returns `true` if the bottom of the page is visible, `false` otherwise."
+  },
+  "btoa": {
+    "prefix": "30s_btoa",
+    "body": [
+      "const btoa = str => Buffer.from(str, 'binary').toString('base64');"
+    ],
+    "description": "Creates a base-64 encoded ASCII string from a String object in which each character in the string is treated as a byte of binary data."
+  },
+  "byteSize": {
+    "prefix": "30s_byteSize",
+    "body": [
+      "const byteSize = str => new Blob([str]).size;"
+    ],
+    "description": "Returns the length of a string in bytes."
+  },
+  "call": {
+    "prefix": "30s_call",
+    "body": [
+      "const call = (key, ...args) => context => context[key](...args);"
+    ],
+    "description": "Given a key and a set of arguments, call them when given a context. Primarily useful in composition."
+  },
+  "capitalize": {
+    "prefix": "30s_capitalize",
+    "body": [
+      "const capitalize = ([first, ...rest], lowerRest = false) =>",
+      "  first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join(''));"
+    ],
+    "description": "Capitalizes the first letter of a string."
+  },
+  "capitalizeEveryWord": {
+    "prefix": "30s_capitalizeEveryWord",
+    "body": [
+      "const capitalizeEveryWord = str => str.replace(/\\b[a-z]/g, char => char.toUpperCase());"
+    ],
+    "description": "Capitalizes the first letter of every word in a string."
+  },
+  "castArray": {
+    "prefix": "30s_castArray",
+    "body": [
+      "const castArray = val => (Array.isArray(val) ? val : [val]);"
+    ],
+    "description": "Casts the provided value as an array if it's not one."
+  },
+  "chainAsync": {
+    "prefix": "30s_chainAsync",
+    "body": [
+      "const chainAsync = fns => {",
+      "  let curr = 0;",
+      "  const next = () => fns[curr++](next);",
+      "  next();",
+      "};"
+    ],
+    "description": "Chains asynchronous functions."
+  },
+  "chunk": {
+    "prefix": "30s_chunk",
+    "body": [
+      "const chunk = (arr, size) =>",
+      "  Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>",
+      "    arr.slice(i * size, i * size + size)",
+      "  );"
+    ],
+    "description": "Chunks an array into smaller arrays of a specified size."
+  },
+  "clampNumber": {
+    "prefix": "30s_clampNumber",
+    "body": [
+      "const clampNumber = (num, a, b) => Math.max(Math.min(num, Math.max(a, b)), Math.min(a, b));"
+    ],
+    "description": "Clamps `num` within the inclusive range specified by the boundary values `a` and `b`."
+  },
+  "cloneRegExp": {
+    "prefix": "30s_cloneRegExp",
+    "body": [
+      "const cloneRegExp = regExp => new RegExp(regExp.source, regExp.flags);"
+    ],
+    "description": "Clones a regular expression."
+  },
+  "coalesce": {
+    "prefix": "30s_coalesce",
+    "body": [
+      "const coalesce = (...args) => args.find(_ => ![undefined, null].includes(_));"
+    ],
+    "description": "Returns the first non-null/undefined argument."
+  },
+  "coalesceFactory": {
+    "prefix": "30s_coalesceFactory",
+    "body": [
+      "const coalesceFactory = valid => (...args) => args.find(valid);"
+    ],
+    "description": "Returns a customized coalesce function that returns the first argument that returns `true` from the provided argument validation function."
+  },
+  "collectInto": {
+    "prefix": "30s_collectInto",
+    "body": [
+      "const collectInto = fn => (...args) => fn(args);"
+    ],
+    "description": "Changes a function that accepts an array into a variadic function."
+  },
+  "colorize": {
+    "prefix": "30s_colorize",
+    "body": [
+      "const colorize = (...args) => ({",
+      "  black: `\\x1b[30m${args.join(' ')}`,",
+      "  red: `\\x1b[31m${args.join(' ')}`,",
+      "  green: `\\x1b[32m${args.join(' ')}`,",
+      "  yellow: `\\x1b[33m${args.join(' ')}`,",
+      "  blue: `\\x1b[34m${args.join(' ')}`,",
+      "  magenta: `\\x1b[35m${args.join(' ')}`,",
+      "  cyan: `\\x1b[36m${args.join(' ')}`,",
+      "  white: `\\x1b[37m${args.join(' ')}`,",
+      "  bgBlack: `\\x1b[40m${args.join(' ')}\\x1b[0m`,",
+      "  bgRed: `\\x1b[41m${args.join(' ')}\\x1b[0m`,",
+      "  bgGreen: `\\x1b[42m${args.join(' ')}\\x1b[0m`,",
+      "  bgYellow: `\\x1b[43m${args.join(' ')}\\x1b[0m`,",
+      "  bgBlue: `\\x1b[44m${args.join(' ')}\\x1b[0m`,",
+      "  bgMagenta: `\\x1b[45m${args.join(' ')}\\x1b[0m`,",
+      "  bgCyan: `\\x1b[46m${args.join(' ')}\\x1b[0m`,",
+      "  bgWhite: `\\x1b[47m${args.join(' ')}\\x1b[0m`",
+      "});"
+    ],
+    "description": "Add special characters to text to print in color in the console (combined with `console.log()`)."
+  },
+  "compact": {
+    "prefix": "30s_compact",
+    "body": [
+      "const compact = arr => arr.filter(Boolean);"
+    ],
+    "description": "Removes falsey values from an array."
+  },
+  "compose": {
+    "prefix": "30s_compose",
+    "body": [
+      "const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));"
+    ],
+    "description": "Performs right-to-left function composition."
+  },
+  "composeRight": {
+    "prefix": "30s_composeRight",
+    "body": [
+      "const composeRight = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));"
+    ],
+    "description": "Performs left-to-right function composition."
+  },
+  "converge": {
+    "prefix": "30s_converge",
+    "body": [
+      "const converge = (converger, fns) => (...args) => converger(...fns.map(fn => fn.apply(null, args)));"
+    ],
+    "description": "Accepts a converging function and a list of branching functions and returns a function that applies each branching function to the arguments and the results of the branching functions are passed as arguments to the converging function."
+  },
+  "copyToClipboard": {
+    "prefix": "30s_copyToClipboard",
+    "body": [
+      "const copyToClipboard = str => {",
+      "  const el = document.createElement('textarea');",
+      "  el.value = str;",
+      "  el.setAttribute('readonly', '');",
+      "  el.style.position = 'absolute';",
+      "  el.style.left = '-9999px';",
+      "  document.body.appendChild(el);",
+      "  const selected =",
+      "    document.getSelection().rangeCount > 0 ? document.getSelection().getRangeAt(0) : false;",
+      "  el.select();",
+      "  document.execCommand('copy');",
+      "  document.body.removeChild(el);",
+      "  if (selected) {",
+      "    document.getSelection().removeAllRanges();",
+      "    document.getSelection().addRange(selected);",
+      "  }",
+      "};"
+    ],
+    "description": "⚠️ **NOTICE:** The same functionality can be easily implemented by using the new asynchronous Clipboard API, which is still experimental but should be used in the future instead of this snippet. Find out more about it [here](https://github.com/w3c/clipboard-apis/blob/master/explainer.adoc#writing-to-the-clipboard)."
+  },
+  "countBy": {
+    "prefix": "30s_countBy",
+    "body": [
+      "const countBy = (arr, fn) =>",
+      "  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => {",
+      "    acc[val] = (acc[val] || 0) + 1;",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Groups the elements of an array based on the given function and returns the count of elements in each group."
+  },
+  "counter": {
+    "prefix": "30s_counter",
+    "body": [
+      "const counter = (selector, start, end, step = 1, duration = 2000) => {",
+      "  let current = start,",
+      "    _step = (end - start) * step < 0 ? -step : step,",
+      "    timer = setInterval(() => {",
+      "      current += _step;",
+      "      document.querySelector(selector).innerHTML = current;",
+      "      if (current >= end) document.querySelector(selector).innerHTML = end;",
+      "      if (current >= end) clearInterval(timer);",
+      "    }, Math.abs(Math.floor(duration / (end - start))));",
+      "  return timer;",
+      "};"
+    ],
+    "description": "Creates a counter with the specified range, step and duration for the specified selector."
+  },
+  "countOccurrences": {
+    "prefix": "30s_countOccurrences",
+    "body": [
+      "const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);"
+    ],
+    "description": "Counts the occurrences of a value in an array."
+  },
+  "createElement": {
+    "prefix": "30s_createElement",
+    "body": [
+      "const createElement = str => {",
+      "  const el = document.createElement('div');",
+      "  el.innerHTML = str;",
+      "  return el.firstElementChild;",
+      "};"
+    ],
+    "description": "Creates an element from a string (without appending it to the document). \r\nIf the given string contains multiple elements, only the first one will be returned."
+  },
+  "createEventHub": {
+    "prefix": "30s_createEventHub",
+    "body": [
+      "const createEventHub = () => ({",
+      "  hub: Object.create(null),",
+      "  emit(event, data) {",
+      "    (this.hub[event] || []).forEach(handler => handler(data));",
+      "  },",
+      "  on(event, handler) {",
+      "    if (!this.hub[event]) this.hub[event] = [];",
+      "    this.hub[event].push(handler);",
+      "  },",
+      "  off(event, handler) {",
+      "    const i = (this.hub[event] || []).findIndex(h => h === handler);",
+      "    if (i > -1) this.hub[event].splice(i, 1);",
+      "  }",
+      "});"
+    ],
+    "description": "Creates a pub/sub ([publish–subscribe](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern)) event hub with `emit`, `on`, and `off` methods."
+  },
+  "CSVToArray": {
+    "prefix": "30s_CSVToArray",
+    "body": [
+      "const CSVToArray = (data, delimiter = ',', omitFirstRow = false) =>",
+      "  data",
+      "    .slice(omitFirstRow ? data.indexOf('\\n') + 1 : 0)",
+      "    .split('\\n')",
+      "    .map(v => v.split(delimiter));"
+    ],
+    "description": "Converts a comma-separated values (CSV) string to a 2D array."
+  },
+  "CSVToJSON": {
+    "prefix": "30s_CSVToJSON",
+    "body": [
+      "const CSVToJSON = (data, delimiter = ',') => {",
+      "  const titles = data.slice(0, data.indexOf('\\n')).split(delimiter);",
+      "  return data",
+      "    .slice(data.indexOf('\\n') + 1)",
+      "    .split('\\n')",
+      "    .map(v => {",
+      "      const values = v.split(delimiter);",
+      "      return titles.reduce((obj, title, index) => ((obj[title] = values[index]), obj), {});",
+      "    });",
+      "};"
+    ],
+    "description": "Converts a comma-separated values (CSV) string to a 2D array of objects.\r\nThe first row of the string is used as the title row."
+  },
+  "currentURL": {
+    "prefix": "30s_currentURL",
+    "body": [
+      "const currentURL = () => window.location.href;"
+    ],
+    "description": "Returns the current URL."
+  },
+  "curry": {
+    "prefix": "30s_curry",
+    "body": [
+      "const curry = (fn, arity = fn.length, ...args) =>",
+      "  arity <= args.length ? fn(...args) : curry.bind(null, fn, arity, ...args);"
+    ],
+    "description": "Curries a function."
+  },
+  "dayOfYear": {
+    "prefix": "30s_dayOfYear",
+    "body": [
+      "const dayOfYear = date =>",
+      "  Math.floor((date - new Date(date.getFullYear(), 0, 0)) / 1000 / 60 / 60 / 24);"
+    ],
+    "description": "Gets the day of the year from a `Date` object."
+  },
+  "debounce": {
+    "prefix": "30s_debounce",
+    "body": [
+      "const debounce = (fn, ms = 0) => {",
+      "  let timeoutId;",
+      "  return function(...args) {",
+      "    clearTimeout(timeoutId);",
+      "    timeoutId = setTimeout(() => fn.apply(this, args), ms);",
+      "  };",
+      "};"
+    ],
+    "description": "Creates a debounced function that delays invoking the provided function until at least `ms` milliseconds have elapsed since the last time it was invoked."
+  },
+  "decapitalize": {
+    "prefix": "30s_decapitalize",
+    "body": [
+      "const decapitalize = ([first, ...rest], upperRest = false) =>",
+      "  first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));"
+    ],
+    "description": "Decapitalizes the first letter of a string."
+  },
+  "deepClone": {
+    "prefix": "30s_deepClone",
+    "body": [
+      "const deepClone = obj => {",
+      "  let clone = Object.assign({}, obj);",
+      "  Object.keys(clone).forEach(",
+      "    key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])",
+      "  );",
+      "  return Array.isArray(obj) ? (clone.length = obj.length) && Array.from(clone) : clone;",
+      "};"
+    ],
+    "description": "Creates a deep clone of an object."
+  },
+  "deepFlatten": {
+    "prefix": "30s_deepFlatten",
+    "body": [
+      "const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));"
+    ],
+    "description": "Deep flattens an array."
+  },
+  "deepFreeze": {
+    "prefix": "30s_deepFreeze",
+    "body": [
+      "const deepFreeze = obj =>",
+      "  Object.keys(obj).forEach(",
+      "    prop =>",
+      "      !(obj[prop] instanceof Object) || Object.isFrozen(obj[prop]) ? null : deepFreeze(obj[prop])",
+      "  ) || Object.freeze(obj);"
+    ],
+    "description": "Deep freezes an object."
+  },
+  "defaults": {
+    "prefix": "30s_defaults",
+    "body": [
+      "const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);"
+    ],
+    "description": "Assigns default values for all properties in an object that are `undefined`."
+  },
+  "defer": {
+    "prefix": "30s_defer",
+    "body": [
+      "const defer = (fn, ...args) => setTimeout(fn, 1, ...args);"
+    ],
+    "description": "Defers invoking a function until the current call stack has cleared."
+  },
+  "degreesToRads": {
+    "prefix": "30s_degreesToRads",
+    "body": [
+      "const degreesToRads = deg => (deg * Math.PI) / 180.0;"
+    ],
+    "description": "Converts an angle from degrees to radians."
+  },
+  "delay": {
+    "prefix": "30s_delay",
+    "body": [
+      "const delay = (fn, wait, ...args) => setTimeout(fn, wait, ...args);"
+    ],
+    "description": "Invokes the provided function after `wait` milliseconds."
+  },
+  "detectDeviceType": {
+    "prefix": "30s_detectDeviceType",
+    "body": [
+      "const detectDeviceType = () =>",
+      "  /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent)",
+      "    ? 'Mobile'",
+      "    : 'Desktop';"
+    ],
+    "description": "Detects wether the website is being opened in a mobile device or a desktop/laptop."
+  },
+  "difference": {
+    "prefix": "30s_difference",
+    "body": [
+      "const difference = (a, b) => {",
+      "  const s = new Set(b);",
+      "  return a.filter(x => !s.has(x));",
+      "};"
+    ],
+    "description": "Returns the difference between two arrays."
+  },
+  "differenceBy": {
+    "prefix": "30s_differenceBy",
+    "body": [
+      "const differenceBy = (a, b, fn) => {",
+      "  const s = new Set(b.map(fn));",
+      "  return a.filter(x => !s.has(fn(x)));",
+      "};"
+    ],
+    "description": "Returns the difference between two arrays, after applying the provided function to each array element of both."
+  },
+  "differenceWith": {
+    "prefix": "30s_differenceWith",
+    "body": [
+      "const differenceWith = (arr, val, comp) => arr.filter(a => val.findIndex(b => comp(a, b)) === -1);"
+    ],
+    "description": "Filters out all values from an array for which the comparator function does not return `true`."
+  },
+  "dig": {
+    "prefix": "30s_dig",
+    "body": [
+      "const dig = (obj, target) =>",
+      "  target in obj",
+      "    ? obj[target]",
+      "    : Object.values(obj).reduce((acc, val) => {",
+      "      if (acc !== undefined) return acc;",
+      "      if (typeof val === 'object') return dig(val, target);",
+      "    }, undefined);"
+    ],
+    "description": "Returns the target value in a nested JSON object, based on the given key."
+  },
+  "digitize": {
+    "prefix": "30s_digitize",
+    "body": [
+      "const digitize = n => [...`${n}`].map(i => parseInt(i));"
+    ],
+    "description": "Converts a number to an array of digits."
+  },
+  "distance": {
+    "prefix": "30s_distance",
+    "body": [
+      "const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);"
+    ],
+    "description": "Returns the distance between two points."
+  },
+  "drop": {
+    "prefix": "30s_drop",
+    "body": [
+      "const drop = (arr, n = 1) => arr.slice(n);"
+    ],
+    "description": "Returns a new array with `n` elements removed from the left."
+  },
+  "dropRight": {
+    "prefix": "30s_dropRight",
+    "body": [
+      "const dropRight = (arr, n = 1) => arr.slice(0, -n);"
+    ],
+    "description": "Returns a new array with `n` elements removed from the right."
+  },
+  "dropRightWhile": {
+    "prefix": "30s_dropRightWhile",
+    "body": [
+      "const dropRightWhile = (arr, func) => {",
+      "  while (arr.length > 0 && !func(arr[arr.length - 1])) arr = arr.slice(0, -1);",
+      "  return arr;",
+      "};"
+    ],
+    "description": "Removes elements from the end of an array until the passed function returns `true`. Returns the remaining elements in the array."
+  },
+  "dropWhile": {
+    "prefix": "30s_dropWhile",
+    "body": [
+      "const dropWhile = (arr, func) => {",
+      "  while (arr.length > 0 && !func(arr[0])) arr = arr.slice(1);",
+      "  return arr;",
+      "};"
+    ],
+    "description": "Removes elements in an array until the passed function returns `true`. Returns the remaining elements in the array."
+  },
+  "elementContains": {
+    "prefix": "30s_elementContains",
+    "body": [
+      "const elementContains = (parent, child) => parent !== child && parent.contains(child);"
+    ],
+    "description": "Returns `true` if the `parent` element contains the `child` element, `false` otherwise."
+  },
+  "elementIsVisibleInViewport": {
+    "prefix": "30s_elementIsVisibleInViewport",
+    "body": [
+      "const elementIsVisibleInViewport = (el, partiallyVisible = false) => {",
+      "  const { top, left, bottom, right } = el.getBoundingClientRect();",
+      "  const { innerHeight, innerWidth } = window;",
+      "  return partiallyVisible",
+      "    ? ((top > 0 && top < innerHeight) || (bottom > 0 && bottom < innerHeight)) &&",
+      "        ((left > 0 && left < innerWidth) || (right > 0 && right < innerWidth))",
+      "    : top >= 0 && left >= 0 && bottom <= innerHeight && right <= innerWidth;",
+      "};"
+    ],
+    "description": "Returns `true` if the element specified is visible in the viewport, `false` otherwise."
+  },
+  "elo": {
+    "prefix": "30s_elo",
+    "body": [
+      "const elo = ([...ratings], kFactor = 32, selfRating) => {",
+      "  const [a, b] = ratings;",
+      "  const expectedScore = (self, opponent) => 1 / (1 + 10 ** ((opponent - self) / 400));",
+      "  const newRating = (rating, i) =>",
+      "    (selfRating || rating) + kFactor * (i - expectedScore(i ? a : b, i ? b : a));",
+      "  if (ratings.length === 2) return [newRating(a, 1), newRating(b, 0)];",
+      "",
+      "  for (let i = 0, len = ratings.length; i < len; i++) {",
+      "    let j = i;",
+      "    while (j < len - 1) {",
+      "      j++;",
+      "      [ratings[i], ratings[j]] = elo([ratings[i], ratings[j]], kFactor);",
+      "    }",
+      "  }",
+      "  return ratings;",
+      "};"
+    ],
+    "description": "Computes the new ratings between two or more opponents using the [Elo rating system](https://en.wikipedia.org/wiki/Elo_rating_system). It takes an array\r\nof pre-ratings and returns an array containing post-ratings.\r\nThe array should be ordered from best performer to worst performer (winner -> loser)."
+  },
+  "equals": {
+    "prefix": "30s_equals",
+    "body": [
+      "const equals = (a, b) => {",
+      "  if (a === b) return true;",
+      "  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();",
+      "  if (!a || !b || (typeof a !== 'object' && typeof b !== 'object')) return a === b;",
+      "  if (a === null || a === undefined || b === null || b === undefined) return false;",
+      "  if (a.prototype !== b.prototype) return false;",
+      "  let keys = Object.keys(a);",
+      "  if (keys.length !== Object.keys(b).length) return false;",
+      "  return keys.every(k => equals(a[k], b[k]));",
+      "};"
+    ],
+    "description": "Performs a deep comparison between two values to determine if they are equivalent."
+  },
+  "escapeHTML": {
+    "prefix": "30s_escapeHTML",
+    "body": [
+      "const escapeHTML = str =>",
+      "  str.replace(",
+      "    /[&<>'\"]/g,",
+      "    tag =>",
+      "      ({",
+      "        '&': '&amp;',",
+      "        '<': '&lt;',",
+      "        '>': '&gt;',",
+      "        \"'\": '&#39;',",
+      "        '\"': '&quot;'",
+      "      }[tag] || tag)",
+      "  );"
+    ],
+    "description": "Escapes a string for use in HTML."
+  },
+  "escapeRegExp": {
+    "prefix": "30s_escapeRegExp",
+    "body": [
+      "const escapeRegExp = str => str.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\$&');"
+    ],
+    "description": "Escapes a string to use in a regular expression."
+  },
+  "everyNth": {
+    "prefix": "30s_everyNth",
+    "body": [
+      "const everyNth = (arr, nth) => arr.filter((e, i) => i % nth === nth - 1);"
+    ],
+    "description": "Returns every nth element in an array."
+  },
+  "extendHex": {
+    "prefix": "30s_extendHex",
+    "body": [
+      "const extendHex = shortHex =>",
+      "  '#' +",
+      "  shortHex",
+      "    .slice(shortHex.startsWith('#') ? 1 : 0)",
+      "    .split('')",
+      "    .map(x => x + x)",
+      "    .join('');"
+    ],
+    "description": "Extends a 3-digit color code to a 6-digit color code."
+  },
+  "factorial": {
+    "prefix": "30s_factorial",
+    "body": [
+      "const factorial = n =>",
+      "  n < 0",
+      "    ? (() => {",
+      "      throw new TypeError('Negative numbers are not allowed!');",
+      "    })()",
+      "    : n <= 1",
+      "      ? 1",
+      "      : n * factorial(n - 1);"
+    ],
+    "description": "Calculates the factorial of a number."
+  },
+  "fibonacci": {
+    "prefix": "30s_fibonacci",
+    "body": [
+      "const fibonacci = n =>",
+      "  Array.from({ length: n }).reduce(",
+      "    (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),",
+      "    []",
+      "  );"
+    ],
+    "description": "Generates an array, containing the Fibonacci sequence, up until the nth term."
+  },
+  "filterNonUnique": {
+    "prefix": "30s_filterNonUnique",
+    "body": [
+      "const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));"
+    ],
+    "description": "Filters out the non-unique values in an array."
+  },
+  "filterNonUniqueBy": {
+    "prefix": "30s_filterNonUniqueBy",
+    "body": [
+      "const filterNonUniqueBy = (arr, fn) =>",
+      "  arr.filter((v, i) => arr.every((x, j) => (i === j) === fn(v, x, i, j)));"
+    ],
+    "description": "Filters out the non-unique values in an array, based on a provided comparator function."
+  },
+  "findKey": {
+    "prefix": "30s_findKey",
+    "body": [
+      "const findKey = (obj, fn) => Object.keys(obj).find(key => fn(obj[key], key, obj));"
+    ],
+    "description": "Returns the first key that satisfies the provided testing function. Otherwise `undefined` is returned."
+  },
+  "findLast": {
+    "prefix": "30s_findLast",
+    "body": [
+      "const findLast = (arr, fn) => arr.filter(fn).pop();"
+    ],
+    "description": "Returns the last element for which the provided function returns a truthy value."
+  },
+  "findLastIndex": {
+    "prefix": "30s_findLastIndex",
+    "body": [
+      "const findLastIndex = (arr, fn) =>",
+      "  arr",
+      "    .map((val, i) => [i, val])",
+      "    .filter(([i, val]) => fn(val, i, arr))",
+      "    .pop()[0];"
+    ],
+    "description": "Returns the index of the last element for which the provided function returns a truthy value."
+  },
+  "findLastKey": {
+    "prefix": "30s_findLastKey",
+    "body": [
+      "const findLastKey = (obj, fn) =>",
+      "  Object.keys(obj)",
+      "    .reverse()",
+      "    .find(key => fn(obj[key], key, obj));"
+    ],
+    "description": "Returns the last key that satisfies the provided testing function.\r\nOtherwise `undefined` is returned."
+  },
+  "flatten": {
+    "prefix": "30s_flatten",
+    "body": [
+      "const flatten = (arr, depth = 1) =>",
+      "  arr.reduce((a, v) => a.concat(depth > 1 && Array.isArray(v) ? flatten(v, depth - 1) : v), []);"
+    ],
+    "description": "Flattens an array up to the specified depth."
+  },
+  "flattenObject": {
+    "prefix": "30s_flattenObject",
+    "body": [
+      "const flattenObject = (obj, prefix = '') =>",
+      "  Object.keys(obj).reduce((acc, k) => {",
+      "    const pre = prefix.length ? prefix + '.' : '';",
+      "    if (typeof obj[k] === 'object') Object.assign(acc, flattenObject(obj[k], pre + k));",
+      "    else acc[pre + k] = obj[k];",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Flatten an object with the paths for keys."
+  },
+  "flip": {
+    "prefix": "30s_flip",
+    "body": [
+      "const flip = fn => (first, ...rest) => fn(...rest, first);"
+    ],
+    "description": "Flip takes a function as an argument, then makes the first argument the last."
+  },
+  "forEachRight": {
+    "prefix": "30s_forEachRight",
+    "body": [
+      "const forEachRight = (arr, callback) =>",
+      "  arr",
+      "    .slice(0)",
+      "    .reverse()",
+      "    .forEach(callback);"
+    ],
+    "description": "Executes a provided function once for each array element, starting from the array's last element."
+  },
+  "formatDuration": {
+    "prefix": "30s_formatDuration",
+    "body": [
+      "const formatDuration = ms => {",
+      "  if (ms < 0) ms = -ms;",
+      "  const time = {",
+      "    day: Math.floor(ms / 86400000),",
+      "    hour: Math.floor(ms / 3600000) % 24,",
+      "    minute: Math.floor(ms / 60000) % 60,",
+      "    second: Math.floor(ms / 1000) % 60,",
+      "    millisecond: Math.floor(ms) % 1000",
+      "  };",
+      "  return Object.entries(time)",
+      "    .filter(val => val[1] !== 0)",
+      "    .map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`)",
+      "    .join(', ');",
+      "};"
+    ],
+    "description": "Returns the human readable format of the given number of milliseconds."
+  },
+  "forOwn": {
+    "prefix": "30s_forOwn",
+    "body": [
+      "const forOwn = (obj, fn) => Object.keys(obj).forEach(key => fn(obj[key], key, obj));"
+    ],
+    "description": "Iterates over all own properties of an object, running a callback for each one."
+  },
+  "forOwnRight": {
+    "prefix": "30s_forOwnRight",
+    "body": [
+      "const forOwnRight = (obj, fn) =>",
+      "  Object.keys(obj)",
+      "    .reverse()",
+      "    .forEach(key => fn(obj[key], key, obj));"
+    ],
+    "description": "Iterates over all own properties of an object in reverse, running a callback for each one."
+  },
+  "fromCamelCase": {
+    "prefix": "30s_fromCamelCase",
+    "body": [
+      "const fromCamelCase = (str, separator = '_') =>",
+      "  str",
+      "    .replace(/([a-z\\d])([A-Z])/g, '$1' + separator + '$2')",
+      "    .replace(/([A-Z]+)([A-Z][a-z\\d]+)/g, '$1' + separator + '$2')",
+      "    .toLowerCase();"
+    ],
+    "description": "Converts a string from camelcase."
+  },
+  "functionName": {
+    "prefix": "30s_functionName",
+    "body": [
+      "const functionName = fn => (console.debug(fn.name), fn);"
+    ],
+    "description": "Logs the name of a function."
+  },
+  "functions": {
+    "prefix": "30s_functions",
+    "body": [
+      "const functions = (obj, inherited = false) =>",
+      "  (inherited",
+      "    ? [...Object.keys(obj), ...Object.keys(Object.getPrototypeOf(obj))]",
+      "    : Object.keys(obj)",
+      "  ).filter(key => typeof obj[key] === 'function');"
+    ],
+    "description": "Returns an array of function property names from own (and optionally inherited) enumerable properties of an object."
+  },
+  "gcd": {
+    "prefix": "30s_gcd",
+    "body": [
+      "const gcd = (...arr) => {",
+      "  const _gcd = (x, y) => (!y ? x : gcd(y, x % y));",
+      "  return [...arr].reduce((a, b) => _gcd(a, b));",
+      "};"
+    ],
+    "description": "Calculates the greatest common divisor between two or more numbers/arrays."
+  },
+  "geometricProgression": {
+    "prefix": "30s_geometricProgression",
+    "body": [
+      "const geometricProgression = (end, start = 1, step = 2) =>",
+      "  Array.from({ length: Math.floor(Math.log(end / start) / Math.log(step)) + 1 }).map(",
+      "    (v, i) => start * step ** i",
+      "  );"
+    ],
+    "description": "Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive and the ratio between two terms is `step`.\r\nReturns an error if `step` equals `1`."
+  },
+  "get": {
+    "prefix": "30s_get",
+    "body": [
+      "const get = (from, ...selectors) =>",
+      "  [...selectors].map(s =>",
+      "    s",
+      "      .replace(/\\[([^\\[\\]]*)\\]/g, '.$1.')",
+      "      .split('.')",
+      "      .filter(t => t !== '')",
+      "      .reduce((prev, cur) => prev && prev[cur], from)",
+      "  );"
+    ],
+    "description": "Retrieve a set of properties indicated by the given selectors from an object."
+  },
+  "getColonTimeFromDate": {
+    "prefix": "30s_getColonTimeFromDate",
+    "body": [
+      "const getColonTimeFromDate = date => date.toTimeString().slice(0, 8);"
+    ],
+    "description": "Returns a string of the form `HH:MM:SS` from a `Date` object."
+  },
+  "getDaysDiffBetweenDates": {
+    "prefix": "30s_getDaysDiffBetweenDates",
+    "body": [
+      "const getDaysDiffBetweenDates = (dateInitial, dateFinal) =>",
+      "  (dateFinal - dateInitial) / (1000 * 3600 * 24);"
+    ],
+    "description": "Returns the difference (in days) between two dates."
+  },
+  "getImages": {
+    "prefix": "30s_getImages",
+    "body": [
+      "const getImages = (el, includeDuplicates = false) => {",
+      "  const images = [...el.getElementsByTagName('img')].map(img => img.getAttribute('src'));",
+      "  return includeDuplicates ? images : [...new Set(images)];",
+      "};"
+    ],
+    "description": "Fetches all images from within an element and puts them into an array"
+  },
+  "getMeridiemSuffixOfInteger": {
+    "prefix": "30s_getMeridiemSuffixOfInteger",
+    "body": [
+      "const getMeridiemSuffixOfInteger = num =>",
+      "  num === 0 || num === 24",
+      "    ? 12 + 'am'",
+      "    : num === 12",
+      "      ? 12 + 'pm'",
+      "      : num < 12",
+      "        ? (num % 12) + 'am'",
+      "        : (num % 12) + 'pm';"
+    ],
+    "description": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value."
+  },
+  "getScrollPosition": {
+    "prefix": "30s_getScrollPosition",
+    "body": [
+      "const getScrollPosition = (el = window) => ({",
+      "  x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,",
+      "  y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop",
+      "});"
+    ],
+    "description": "Returns the scroll position of the current page."
+  },
+  "getStyle": {
+    "prefix": "30s_getStyle",
+    "body": [
+      "const getStyle = (el, ruleName) => getComputedStyle(el)[ruleName];"
+    ],
+    "description": "Returns the value of a CSS rule for the specified element."
+  },
+  "getType": {
+    "prefix": "30s_getType",
+    "body": [
+      "const getType = v =>",
+      "  v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();"
+    ],
+    "description": "Returns the native type of a value."
+  },
+  "getURLParameters": {
+    "prefix": "30s_getURLParameters",
+    "body": [
+      "const getURLParameters = url =>",
+      "  (url.match(/([^?=&]+)(=([^&]*))/g) || []).reduce(",
+      "    (a, v) => ((a[v.slice(0, v.indexOf('='))] = v.slice(v.indexOf('=') + 1)), a),",
+      "    {}",
+      "  );"
+    ],
+    "description": "Returns an object containing the parameters of the current URL."
+  },
+  "groupBy": {
+    "prefix": "30s_groupBy",
+    "body": [
+      "const groupBy = (arr, fn) =>",
+      "  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val, i) => {",
+      "    acc[val] = (acc[val] || []).concat(arr[i]);",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Groups the elements of an array based on the given function."
+  },
+  "hammingDistance": {
+    "prefix": "30s_hammingDistance",
+    "body": [
+      "const hammingDistance = (num1, num2) => ((num1 ^ num2).toString(2).match(/1/g) || '').length;"
+    ],
+    "description": "Calculates the Hamming distance between two values."
+  },
+  "hasClass": {
+    "prefix": "30s_hasClass",
+    "body": [
+      "const hasClass = (el, className) => el.classList.contains(className);"
+    ],
+    "description": "Returns `true` if the element has the specified class, `false` otherwise."
+  },
+  "hasFlags": {
+    "prefix": "30s_hasFlags",
+    "body": [
+      "const hasFlags = (...flags) =>",
+      "  flags.every(flag => process.argv.includes(/^-{1,2}/.test(flag) ? flag : '--' + flag));"
+    ],
+    "description": "Check if the current process's arguments contain the specified flags."
+  },
+  "hashBrowser": {
+    "prefix": "30s_hashBrowser",
+    "body": [
+      "const hashBrowser = val =>",
+      "  crypto.subtle.digest('SHA-256', new TextEncoder('utf-8').encode(val)).then(h => {",
+      "    let hexes = [],",
+      "      view = new DataView(h);",
+      "    for (let i = 0; i < view.byteLength; i += 4)",
+      "      hexes.push(('00000000' + view.getUint32(i).toString(16)).slice(-8));",
+      "    return hexes.join('');",
+      "  });"
+    ],
+    "description": "Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise."
+  },
+  "hashNode": {
+    "prefix": "30s_hashNode",
+    "body": [
+      "const crypto = require('crypto');",
+      "const hashNode = val =>",
+      "  new Promise(resolve =>",
+      "    setTimeout(",
+      "      () =>",
+      "        resolve(",
+      "          crypto",
+      "            .createHash('sha256')",
+      "            .update(val)",
+      "            .digest('hex')",
+      "        ),",
+      "      0",
+      "    )",
+      "  );"
+    ],
+    "description": "Creates a hash for a value using the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) algorithm. Returns a promise."
+  },
+  "head": {
+    "prefix": "30s_head",
+    "body": [
+      "const head = arr => arr[0];"
+    ],
+    "description": "Returns the head of a list."
+  },
+  "hexToRGB": {
+    "prefix": "30s_hexToRGB",
+    "body": [
+      "const hexToRGB = hex => {",
+      "  let alpha = false,",
+      "    h = hex.slice(hex.startsWith('#') ? 1 : 0);",
+      "  if (h.length === 3) h = [...h].map(x => x + x).join('');",
+      "  else if (h.length === 8) alpha = true;",
+      "  h = parseInt(h, 16);",
+      "  return (",
+      "    'rgb' +",
+      "    (alpha ? 'a' : '') +",
+      "    '(' +",
+      "    (h >>> (alpha ? 24 : 16)) +",
+      "    ', ' +",
+      "    ((h & (alpha ? 0x00ff0000 : 0x00ff00)) >>> (alpha ? 16 : 8)) +",
+      "    ', ' +",
+      "    ((h & (alpha ? 0x0000ff00 : 0x0000ff)) >>> (alpha ? 8 : 0)) +",
+      "    (alpha ? `, ${h & 0x000000ff}` : '') +",
+      "    ')'",
+      "  );",
+      "};"
+    ],
+    "description": "Converts a color code to a `rgb()` or `rgba()` string if alpha value is provided."
+  },
+  "hide": {
+    "prefix": "30s_hide",
+    "body": [
+      "const hide = els => els.forEach(e => (e.style.display = 'none'));"
+    ],
+    "description": "Hides all the elements specified."
+  },
+  "httpGet": {
+    "prefix": "30s_httpGet",
+    "body": [
+      "const httpGet = (url, callback, err = console.error) => {",
+      "  const request = new XMLHttpRequest();",
+      "  request.open('GET', url, true);",
+      "  request.onload = () => callback(request.responseText);",
+      "  request.onerror = () => err(request);",
+      "  request.send();",
+      "};"
+    ],
+    "description": "Makes a `GET` request to the passed URL."
+  },
+  "httpPost": {
+    "prefix": "30s_httpPost",
+    "body": [
+      "const httpPost = (url, data, callback, err = console.error) => {",
+      "  const request = new XMLHttpRequest();",
+      "  request.open('POST', url, true);",
+      "  request.setRequestHeader('Content-type', 'application/json; charset=utf-8');",
+      "  request.onload = () => callback(request.responseText);",
+      "  request.onerror = () => err(request);",
+      "  request.send(data);",
+      "};"
+    ],
+    "description": "Makes a `POST` request to the passed URL."
+  },
+  "httpsRedirect": {
+    "prefix": "30s_httpsRedirect",
+    "body": [
+      "const httpsRedirect = () => {",
+      "  if (location.protocol !== 'https:') location.replace('https://' + location.href.split('//')[1]);",
+      "};"
+    ],
+    "description": "Redirects the page to HTTPS if its currently in HTTP. Also, pressing the back button doesn't take it back to the HTTP page as its replaced in the history."
+  },
+  "hz": {
+    "prefix": "30s_hz",
+    "body": [
+      "const hz = (fn, iterations = 100) => {",
+      "  const before = performance.now();",
+      "  for (let i = 0; i < iterations; i++) fn();",
+      "  return (1000 * iterations) / (performance.now() - before);",
+      "};"
+    ],
+    "description": "Returns the number of times a function executed per second. \r\n`hz` is the unit for `hertz`, the unit of frequency defined as one cycle per second."
+  },
+  "indentString": {
+    "prefix": "30s_indentString",
+    "body": [
+      "const indentString = (str, count, indent = ' ') => str.replace(/^/gm, indent.repeat(count));"
+    ],
+    "description": "Indents each line in the provided string."
+  },
+  "indexOfAll": {
+    "prefix": "30s_indexOfAll",
+    "body": [
+      "const indexOfAll = (arr, val) => arr.reduce((acc, el, i) => (el === val ? [...acc, i] : acc), []);"
+    ],
+    "description": "Returns all indices of `val` in an array.\r\nIf `val` never occurs, returns `[]`."
+  },
+  "initial": {
+    "prefix": "30s_initial",
+    "body": [
+      "const initial = arr => arr.slice(0, -1);"
+    ],
+    "description": "Returns all the elements of an array except the last one."
+  },
+  "initialize2DArray": {
+    "prefix": "30s_initialize2DArray",
+    "body": [
+      "const initialize2DArray = (w, h, val = null) =>",
+      "  Array.from({ length: h }).map(() => Array.from({ length: w }).fill(val));"
+    ],
+    "description": "Initializes a 2D array of given width and height and value."
+  },
+  "initializeArrayWithRange": {
+    "prefix": "30s_initializeArrayWithRange",
+    "body": [
+      "const initializeArrayWithRange = (end, start = 0, step = 1) =>",
+      "  Array.from({ length: Math.ceil((end - start + 1) / step) }, (v, i) => i * step + start);"
+    ],
+    "description": "Initializes an array containing the numbers in the specified range where `start` and `end` are inclusive with their common difference `step`."
+  },
+  "initializeArrayWithRangeRight": {
+    "prefix": "30s_initializeArrayWithRangeRight",
+    "body": [
+      "const initializeArrayWithRangeRight = (end, start = 0, step = 1) =>",
+      "  Array.from({ length: Math.ceil((end + 1 - start) / step) }).map(",
+      "    (v, i, arr) => (arr.length - i - 1) * step + start",
+      "  );"
+    ],
+    "description": "Initializes an array containing the numbers in the specified range (in reverse) where `start` and `end` are inclusive with their common difference `step`."
+  },
+  "initializeArrayWithValues": {
+    "prefix": "30s_initializeArrayWithValues",
+    "body": [
+      "const initializeArrayWithValues = (n, val = 0) => Array(n).fill(val);"
+    ],
+    "description": "Initializes and fills an array with the specified values."
+  },
+  "initializeNDArray": {
+    "prefix": "30s_initializeNDArray",
+    "body": [
+      "const initializeNDArray = (val, ...args) =>",
+      "  args.length === 0",
+      "    ? val",
+      "    : Array.from({ length: args[0] }).map(() => initializeNDArray(val, ...args.slice(1)));"
+    ],
+    "description": "Create a n-dimensional array with given value."
+  },
+  "inRange": {
+    "prefix": "30s_inRange",
+    "body": [
+      "const inRange = (n, start, end = null) => {",
+      "  if (end && start > end) [end, start] = [start, end];",
+      "  return end == null ? n >= 0 && n < start : n >= start && n < end;",
+      "};"
+    ],
+    "description": "Checks if the given number falls within the given range."
+  },
+  "insertAfter": {
+    "prefix": "30s_insertAfter",
+    "body": [
+      "const insertAfter = (el, htmlString) => el.insertAdjacentHTML('afterend', htmlString);"
+    ],
+    "description": "Inserts an HTML string after the end of the specified element."
+  },
+  "insertBefore": {
+    "prefix": "30s_insertBefore",
+    "body": [
+      "const insertBefore = (el, htmlString) => el.insertAdjacentHTML('beforebegin', htmlString);"
+    ],
+    "description": "Inserts an HTML string before the start of the specified element."
+  },
+  "intersection": {
+    "prefix": "30s_intersection",
+    "body": [
+      "const intersection = (a, b) => {",
+      "  const s = new Set(b);",
+      "  return a.filter(x => s.has(x));",
+      "};"
+    ],
+    "description": "Returns a list of elements that exist in both arrays."
+  },
+  "intersectionBy": {
+    "prefix": "30s_intersectionBy",
+    "body": [
+      "const intersectionBy = (a, b, fn) => {",
+      "  const s = new Set(b.map(fn));",
+      "  return a.filter(x => s.has(fn(x)));",
+      "};"
+    ],
+    "description": "Returns a list of elements that exist in both arrays, after applying the provided function to each array element of both."
+  },
+  "intersectionWith": {
+    "prefix": "30s_intersectionWith",
+    "body": [
+      "const intersectionWith = (a, b, comp) => a.filter(x => b.findIndex(y => comp(x, y)) !== -1);"
+    ],
+    "description": "Returns a list of elements that exist in both arrays, using a provided comparator function."
+  },
+  "invertKeyValues": {
+    "prefix": "30s_invertKeyValues",
+    "body": [
+      "const invertKeyValues = (obj, fn) =>",
+      "  Object.keys(obj).reduce((acc, key) => {",
+      "    const val = fn ? fn(obj[key]) : obj[key];",
+      "    acc[val] = acc[val] || [];",
+      "    acc[val].push(key);",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Inverts the key-value pairs of an object, without mutating it. The corresponding inverted value of each inverted key is an array of keys responsible for generating the inverted value. If a function is supplied, it is applied to each inverted key."
+  },
+  "is": {
+    "prefix": "30s_is",
+    "body": [
+      "const is = (type, val) => ![, null].includes(val) && val.constructor === type;"
+    ],
+    "description": "Checks if the provided value is of the specified type."
+  },
+  "isAbsoluteURL": {
+    "prefix": "30s_isAbsoluteURL",
+    "body": [
+      "const isAbsoluteURL = str => /^[a-z][a-z0-9+.-]*:/.test(str);"
+    ],
+    "description": "Returns `true` if the given string is an absolute URL, `false` otherwise."
+  },
+  "isAfterDate": {
+    "prefix": "30s_isAfterDate",
+    "body": [
+      "const isAfterDate = (dateA, dateB) => dateA > dateB;"
+    ],
+    "description": "Check if a date is after another date."
+  },
+  "isAnagram": {
+    "prefix": "30s_isAnagram",
+    "body": [
+      "const isAnagram = (str1, str2) => {",
+      "  const normalize = str =>",
+      "    str",
+      "      .toLowerCase()",
+      "      .replace(/[^a-z0-9]/gi, '')",
+      "      .split('')",
+      "      .sort()",
+      "      .join('');",
+      "  return normalize(str1) === normalize(str2);",
+      "};"
+    ],
+    "description": "Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)."
+  },
+  "isArrayLike": {
+    "prefix": "30s_isArrayLike",
+    "body": [
+      "const isArrayLike = obj => obj != null && typeof obj[Symbol.iterator] === 'function';"
+    ],
+    "description": "Checks if the provided argument is array-like (i.e. is iterable)."
+  },
+  "isBeforeDate": {
+    "prefix": "30s_isBeforeDate",
+    "body": [
+      "const isBeforeDate = (dateA, dateB) => dateA < dateB;"
+    ],
+    "description": "Check if a date is before another date."
+  },
+  "isBoolean": {
+    "prefix": "30s_isBoolean",
+    "body": [
+      "const isBoolean = val => typeof val === 'boolean';"
+    ],
+    "description": "Checks if the given argument is a native boolean element."
+  },
+  "isBrowser": {
+    "prefix": "30s_isBrowser",
+    "body": [
+      "const isBrowser = () => ![typeof window, typeof document].includes('undefined');"
+    ],
+    "description": "Determines if the current runtime environment is a browser so that front-end modules can run on the server (Node) without throwing errors."
+  },
+  "isBrowserTabFocused": {
+    "prefix": "30s_isBrowserTabFocused",
+    "body": [
+      "const isBrowserTabFocused = () => !document.hidden;"
+    ],
+    "description": "Returns `true` if the browser tab of the page is focused, `false` otherwise."
+  },
+  "isDivisible": {
+    "prefix": "30s_isDivisible",
+    "body": [
+      "const isDivisible = (dividend, divisor) => dividend % divisor === 0;"
+    ],
+    "description": "Checks if the first numeric argument is divisible by the second one."
+  },
+  "isDuplexStream": {
+    "prefix": "30s_isDuplexStream",
+    "body": [
+      "const isDuplexStream = val =>",
+      "  val !== null &&",
+      "  typeof val === 'object' &&",
+      "  typeof val.pipe === 'function' &&",
+      "  typeof val._read === 'function' &&",
+      "  typeof val._readableState === 'object' &&",
+      "  typeof val._write === 'function' &&",
+      "  typeof val._writableState === 'object';"
+    ],
+    "description": "Checks if the given argument is a duplex (readable and writable) stream."
+  },
+  "isEmpty": {
+    "prefix": "30s_isEmpty",
+    "body": [
+      "const isEmpty = val => val == null || !(Object.keys(val) || val).length;"
+    ],
+    "description": "Returns true if the a value is an empty object, collection, map or set, has no enumerable properties or is any type that is not considered a collection."
+  },
+  "isEven": {
+    "prefix": "30s_isEven",
+    "body": [
+      "const isEven = num => num % 2 === 0;"
+    ],
+    "description": "Returns `true` if the given number is even, `false` otherwise."
+  },
+  "isFunction": {
+    "prefix": "30s_isFunction",
+    "body": [
+      "const isFunction = val => typeof val === 'function';"
+    ],
+    "description": "Checks if the given argument is a function."
+  },
+  "isLowerCase": {
+    "prefix": "30s_isLowerCase",
+    "body": [
+      "const isLowerCase = str => str === str.toLowerCase();"
+    ],
+    "description": "Checks if a string is lower case."
+  },
+  "isNil": {
+    "prefix": "30s_isNil",
+    "body": [
+      "const isNil = val => val === undefined || val === null;"
+    ],
+    "description": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise."
+  },
+  "isNull": {
+    "prefix": "30s_isNull",
+    "body": [
+      "const isNull = val => val === null;"
+    ],
+    "description": "Returns `true` if the specified value is `null`, `false` otherwise."
+  },
+  "isNumber": {
+    "prefix": "30s_isNumber",
+    "body": [
+      "const isNumber = val => typeof val === 'number';"
+    ],
+    "description": "Checks if the given argument is a number."
+  },
+  "isObject": {
+    "prefix": "30s_isObject",
+    "body": [
+      "const isObject = obj => obj === Object(obj);"
+    ],
+    "description": "Returns a boolean determining if the passed value is an object or not."
+  },
+  "isObjectLike": {
+    "prefix": "30s_isObjectLike",
+    "body": [
+      "const isObjectLike = val => val !== null && typeof val === 'object';"
+    ],
+    "description": "Checks if a value is object-like."
+  },
+  "isPlainObject": {
+    "prefix": "30s_isPlainObject",
+    "body": [
+      "const isPlainObject = val => !!val && typeof val === 'object' && val.constructor === Object;"
+    ],
+    "description": "Checks if the provided value is an object created by the Object constructor."
+  },
+  "isPrime": {
+    "prefix": "30s_isPrime",
+    "body": [
+      "const isPrime = num => {",
+      "  const boundary = Math.floor(Math.sqrt(num));",
+      "  for (var i = 2; i <= boundary; i++) if (num % i === 0) return false;",
+      "  return num >= 2;",
+      "};"
+    ],
+    "description": "Checks if the provided integer is a prime number."
+  },
+  "isPrimitive": {
+    "prefix": "30s_isPrimitive",
+    "body": [
+      "const isPrimitive = val => Object(val) !== val;"
+    ],
+    "description": "Returns a boolean determining if the passed value is primitive or not."
+  },
+  "isPromiseLike": {
+    "prefix": "30s_isPromiseLike",
+    "body": [
+      "const isPromiseLike = obj =>",
+      "  obj !== null &&",
+      "  (typeof obj === 'object' || typeof obj === 'function') &&",
+      "  typeof obj.then === 'function';"
+    ],
+    "description": "Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise."
+  },
+  "isReadableStream": {
+    "prefix": "30s_isReadableStream",
+    "body": [
+      "const isReadableStream = val =>",
+      "  val !== null &&",
+      "  typeof val === 'object' &&",
+      "  typeof val.pipe === 'function' &&",
+      "  typeof val._read === 'function' &&",
+      "  typeof val._readableState === 'object';"
+    ],
+    "description": "Checks if the given argument is a readable stream."
+  },
+  "isSameDate": {
+    "prefix": "30s_isSameDate",
+    "body": [
+      "const isSameDate = (dateA, dateB) => dateA.toISOString() === dateB.toISOString();"
+    ],
+    "description": "Check if a date is the same as another date."
+  },
+  "isSorted": {
+    "prefix": "30s_isSorted",
+    "body": [
+      "const isSorted = arr => {",
+      "  let direction = -(arr[0] - arr[1]);",
+      "  for (let [i, val] of arr.entries()) {",
+      "    direction = !direction ? -(arr[i - 1] - arr[i]) : direction;",
+      "    if (i === arr.length - 1) return !direction ? 0 : direction;",
+      "    else if ((val - arr[i + 1]) * direction > 0) return 0;",
+      "  }",
+      "};"
+    ],
+    "description": "Returns `1` if the array is sorted in ascending order, `-1` if it is sorted in descending order or `0` if it is not sorted."
+  },
+  "isStream": {
+    "prefix": "30s_isStream",
+    "body": [
+      "const isStream = val => val !== null && typeof val === 'object' && typeof val.pipe === 'function';"
+    ],
+    "description": "Checks if the given argument is a stream."
+  },
+  "isString": {
+    "prefix": "30s_isString",
+    "body": [
+      "const isString = val => typeof val === 'string';"
+    ],
+    "description": "Checks if the given argument is a string. Only works for string primitives."
+  },
+  "isSymbol": {
+    "prefix": "30s_isSymbol",
+    "body": [
+      "const isSymbol = val => typeof val === 'symbol';"
+    ],
+    "description": "Checks if the given argument is a symbol."
+  },
+  "isTravisCI": {
+    "prefix": "30s_isTravisCI",
+    "body": [
+      "const isTravisCI = () => 'TRAVIS' in process.env && 'CI' in process.env;"
+    ],
+    "description": "Checks if the current environment is [Travis CI](https://travis-ci.org/)."
+  },
+  "isUndefined": {
+    "prefix": "30s_isUndefined",
+    "body": [
+      "const isUndefined = val => val === undefined;"
+    ],
+    "description": "Returns `true` if the specified value is `undefined`, `false` otherwise."
+  },
+  "isUpperCase": {
+    "prefix": "30s_isUpperCase",
+    "body": [
+      "const isUpperCase = str => str === str.toUpperCase();"
+    ],
+    "description": "Checks if a string is upper case."
+  },
+  "isValidJSON": {
+    "prefix": "30s_isValidJSON",
+    "body": [
+      "const isValidJSON = obj => {",
+      "  try {",
+      "    JSON.parse(obj);",
+      "    return true;",
+      "  } catch (e) {",
+      "    return false;",
+      "  }",
+      "};"
+    ],
+    "description": "Checks if the provided argument is a valid JSON."
+  },
+  "isWritableStream": {
+    "prefix": "30s_isWritableStream",
+    "body": [
+      "const isWritableStream = val =>",
+      "  val !== null &&",
+      "  typeof val === 'object' &&",
+      "  typeof val.pipe === 'function' &&",
+      "  typeof val._write === 'function' &&",
+      "  typeof val._writableState === 'object';"
+    ],
+    "description": "Checks if the given argument is a writable stream."
+  },
+  "join": {
+    "prefix": "30s_join",
+    "body": [
+      "const join = (arr, separator = ',', end = separator) =>",
+      "  arr.reduce(",
+      "    (acc, val, i) =>",
+      "      i === arr.length - 2",
+      "        ? acc + val + end",
+      "        : i === arr.length - 1",
+      "          ? acc + val",
+      "          : acc + val + separator,",
+      "    ''",
+      "  );"
+    ],
+    "description": "Joins all elements of an array into a string and returns this string.\r\nUses a separator and an end separator."
+  },
+  "JSONtoCSV": {
+    "prefix": "30s_JSONtoCSV",
+    "body": [
+      "const JSONtoCSV = (arr, columns, delimiter = ',') =>",
+      "  [",
+      "    columns.join(delimiter),",
+      "    ...arr.map(obj =>",
+      "      columns.reduce(",
+      "        (acc, key) => `${acc}${!acc.length ? '' : delimiter}\"${!obj[key] ? '' : obj[key]}\"`,",
+      "        ''",
+      "      )",
+      "    )",
+      "  ].join('\\n');"
+    ],
+    "description": "Converts an array of objects to a comma-separated values (CSV) string that contains only the `columns` specified."
+  },
+  "JSONToFile": {
+    "prefix": "30s_JSONToFile",
+    "body": [
+      "const fs = require('fs');",
+      "const JSONToFile = (obj, filename) =>",
+      "  fs.writeFile(`${filename}.json`, JSON.stringify(obj, null, 2));"
+    ],
+    "description": "Writes a JSON object to a file."
+  },
+  "last": {
+    "prefix": "30s_last",
+    "body": [
+      "const last = arr => arr[arr.length - 1];"
+    ],
+    "description": "Returns the last element in an array."
+  },
+  "lcm": {
+    "prefix": "30s_lcm",
+    "body": [
+      "const lcm = (...arr) => {",
+      "  const gcd = (x, y) => (!y ? x : gcd(y, x % y));",
+      "  const _lcm = (x, y) => (x * y) / gcd(x, y);",
+      "  return [...arr].reduce((a, b) => _lcm(a, b));",
+      "};"
+    ],
+    "description": "Returns the least common multiple of two or more numbers."
+  },
+  "longestItem": {
+    "prefix": "30s_longestItem",
+    "body": [
+      "const longestItem = (...vals) => vals.reduce((a, x) => (x.length > a.length ? x : a));"
+    ],
+    "description": "Takes any number of iterable objects or objects with a `length` property and returns the longest one.\r\nIf multiple objects have the same length, the first one will be returned.\r\nReturns `undefined` if no arguments are provided."
+  },
+  "lowercaseKeys": {
+    "prefix": "30s_lowercaseKeys",
+    "body": [
+      "const lowercaseKeys = obj =>",
+      "  Object.keys(obj).reduce((acc, key) => {",
+      "    acc[key.toLowerCase()] = obj[key];",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Creates a new object from the specified object, where all the keys are in lowercase."
+  },
+  "luhnCheck": {
+    "prefix": "30s_luhnCheck",
+    "body": [
+      "const luhnCheck = num => {",
+      "  let arr = (num + '')",
+      "    .split('')",
+      "    .reverse()",
+      "    .map(x => parseInt(x));",
+      "  let lastDigit = arr.splice(0, 1)[0];",
+      "  let sum = arr.reduce((acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9), 0);",
+      "  sum += lastDigit;",
+      "  return sum % 10 === 0;",
+      "};"
+    ],
+    "description": "Implementation of the [Luhn Algorithm](https://en.wikipedia.org/wiki/Luhn_algorithm) used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers etc."
+  },
+  "mapKeys": {
+    "prefix": "30s_mapKeys",
+    "body": [
+      "const mapKeys = (obj, fn) =>",
+      "  Object.keys(obj).reduce((acc, k) => {",
+      "    acc[fn(obj[k], k, obj)] = obj[k];",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Creates an object with keys generated by running the provided function for each key and the same values as the provided object."
+  },
+  "mapObject": {
+    "prefix": "30s_mapObject",
+    "body": [
+      "const mapObject = (arr, fn) =>",
+      "  (a => (",
+      "    (a = [arr, arr.map(fn)]), a[0].reduce((acc, val, ind) => ((acc[val] = a[1][ind]), acc), {})",
+      "  ))();"
+    ],
+    "description": "Maps the values of an array to an object using a function, where the key-value pairs consist of the original value as the key and the mapped value."
+  },
+  "mapString": {
+    "prefix": "30s_mapString",
+    "body": [
+      "const mapString = (str, fn) =>",
+      "  str",
+      "    .split('')",
+      "    .map((c, i) => fn(c, i, str))",
+      "    .join('');"
+    ],
+    "description": "Creates a new string with the results of calling a provided function on every character in the calling string."
+  },
+  "mapValues": {
+    "prefix": "30s_mapValues",
+    "body": [
+      "const mapValues = (obj, fn) =>",
+      "  Object.keys(obj).reduce((acc, k) => {",
+      "    acc[k] = fn(obj[k], k, obj);",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Creates an object with the same keys as the provided object and values generated by running the provided function for each value."
+  },
+  "mask": {
+    "prefix": "30s_mask",
+    "body": [
+      "const mask = (cc, num = 4, mask = '*') => `${cc}`.slice(-num).padStart(`${cc}`.length, mask);"
+    ],
+    "description": "Replaces all but the last `num` of characters with the specified mask character."
+  },
+  "matches": {
+    "prefix": "30s_matches",
+    "body": [
+      "const matches = (obj, source) =>",
+      "  Object.keys(source).every(key => obj.hasOwnProperty(key) && obj[key] === source[key]);"
+    ],
+    "description": "Compares two objects to determine if the first one contains equivalent property values to the second one."
+  },
+  "matchesWith": {
+    "prefix": "30s_matchesWith",
+    "body": [
+      "const matchesWith = (obj, source, fn) =>",
+      "  Object.keys(source).every(",
+      "    key =>",
+      "      obj.hasOwnProperty(key) && fn",
+      "        ? fn(obj[key], source[key], key, obj, source)",
+      "        : obj[key] == source[key]",
+      "  );"
+    ],
+    "description": "Compares two objects to determine if the first one contains equivalent property values to the second one, based on a provided function."
+  },
+  "maxBy": {
+    "prefix": "30s_maxBy",
+    "body": [
+      "const maxBy = (arr, fn) => Math.max(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));"
+    ],
+    "description": "Returns the maximum value of an array, after mapping each element to a value using the provided function."
+  },
+  "maxDate": {
+    "prefix": "30s_maxDate",
+    "body": [
+      "const maxDate = (...dates) => new Date(Math.max.apply(null, ...dates));"
+    ],
+    "description": "Returns the maximum of the given dates."
+  },
+  "maxN": {
+    "prefix": "30s_maxN",
+    "body": [
+      "const maxN = (arr, n = 1) => [...arr].sort((a, b) => b - a).slice(0, n);"
+    ],
+    "description": "Returns the `n` maximum elements from the provided array.\r\nIf `n` is greater than or equal to the provided array's length, then return the original array (sorted in descending order)."
+  },
+  "median": {
+    "prefix": "30s_median",
+    "body": [
+      "const median = arr => {",
+      "  const mid = Math.floor(arr.length / 2),",
+      "    nums = [...arr].sort((a, b) => a - b);",
+      "  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;",
+      "};"
+    ],
+    "description": "Returns the median of an array of numbers."
+  },
+  "memoize": {
+    "prefix": "30s_memoize",
+    "body": [
+      "const memoize = fn => {",
+      "  const cache = new Map();",
+      "  const cached = function(val) {",
+      "    return cache.has(val) ? cache.get(val) : cache.set(val, fn.call(this, val)) && cache.get(val);",
+      "  };",
+      "  cached.cache = cache;",
+      "  return cached;",
+      "};"
+    ],
+    "description": "Returns the memoized (cached) function."
+  },
+  "merge": {
+    "prefix": "30s_merge",
+    "body": [
+      "const merge = (...objs) =>",
+      "  [...objs].reduce(",
+      "    (acc, obj) =>",
+      "      Object.keys(obj).reduce((a, k) => {",
+      "        acc[k] = acc.hasOwnProperty(k) ? [].concat(acc[k]).concat(obj[k]) : obj[k];",
+      "        return acc;",
+      "      }, {}),",
+      "    {}",
+      "  );"
+    ],
+    "description": "Creates a new object from the combination of two or more objects."
+  },
+  "minBy": {
+    "prefix": "30s_minBy",
+    "body": [
+      "const minBy = (arr, fn) => Math.min(...arr.map(typeof fn === 'function' ? fn : val => val[fn]));"
+    ],
+    "description": "Returns the minimum value of an array, after mapping each element to a value using the provided function."
+  },
+  "minDate": {
+    "prefix": "30s_minDate",
+    "body": [
+      "const minDate = (...dates) => new Date(Math.min.apply(null, ...dates));"
+    ],
+    "description": "Returns the minimum of the given dates."
+  },
+  "minN": {
+    "prefix": "30s_minN",
+    "body": [
+      "const minN = (arr, n = 1) => [...arr].sort((a, b) => a - b).slice(0, n);"
+    ],
+    "description": "Returns the `n` minimum elements from the provided array.\r\nIf `n` is greater than or equal to the provided array's length, then return the original array (sorted in ascending order)."
+  },
+  "mostPerformant": {
+    "prefix": "30s_mostPerformant",
+    "body": [
+      "const mostPerformant = (fns, iterations = 10000) => {",
+      "  const times = fns.map(fn => {",
+      "    const before = performance.now();",
+      "    for (let i = 0; i < iterations; i++) fn();",
+      "    return performance.now() - before;",
+      "  });",
+      "  return times.indexOf(Math.min(...times));",
+      "};"
+    ],
+    "description": "Returns the index of the function in an array of functions which executed the fastest."
+  },
+  "negate": {
+    "prefix": "30s_negate",
+    "body": [
+      "const negate = func => (...args) => !func(...args);"
+    ],
+    "description": "Negates a predicate function."
+  },
+  "nest": {
+    "prefix": "30s_nest",
+    "body": [
+      "const nest = (items, id = null, link = 'parent_id') =>",
+      "  items",
+      "    .filter(item => item[link] === id)",
+      "    .map(item => ({ ...item, children: nest(items, item.id) }));"
+    ],
+    "description": "Given a flat array of objects linked to one another, it will nest them recursively.\r\nUseful for nesting comments, such as the ones on reddit.com."
+  },
+  "nodeListToArray": {
+    "prefix": "30s_nodeListToArray",
+    "body": [
+      "const nodeListToArray = nodeList => [...nodeList];"
+    ],
+    "description": "Converts a `NodeList` to an array."
+  },
+  "none": {
+    "prefix": "30s_none",
+    "body": [
+      "const none = (arr, fn = Boolean) => !arr.some(fn);"
+    ],
+    "description": "Returns `true` if the provided predicate function returns `false` for all elements in a collection, `false` otherwise."
+  },
+  "nthArg": {
+    "prefix": "30s_nthArg",
+    "body": [
+      "const nthArg = n => (...args) => args.slice(n)[0];"
+    ],
+    "description": "Creates a function that gets the argument at index `n`. If `n` is negative, the nth argument from the end is returned."
+  },
+  "nthElement": {
+    "prefix": "30s_nthElement",
+    "body": [
+      "const nthElement = (arr, n = 0) => (n === -1 ? arr.slice(n) : arr.slice(n, n + 1))[0];"
+    ],
+    "description": "Returns the nth element of an array."
+  },
+  "objectFromPairs": {
+    "prefix": "30s_objectFromPairs",
+    "body": [
+      "const objectFromPairs = arr => arr.reduce((a, [key, val]) => ((a[key] = val), a), {});"
+    ],
+    "description": "Creates an object from the given key-value pairs."
+  },
+  "objectToPairs": {
+    "prefix": "30s_objectToPairs",
+    "body": [
+      "const objectToPairs = obj => Object.keys(obj).map(k => [k, obj[k]]);"
+    ],
+    "description": "Creates an array of key-value pair arrays from an object."
+  },
+  "observeMutations": {
+    "prefix": "30s_observeMutations",
+    "body": [
+      "const observeMutations = (element, callback, options) => {",
+      "  const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));",
+      "  observer.observe(",
+      "    element,",
+      "    Object.assign(",
+      "      {",
+      "        childList: true,",
+      "        attributes: true,",
+      "        attributeOldValue: true,",
+      "        characterData: true,",
+      "        characterDataOldValue: true,",
+      "        subtree: true",
+      "      },",
+      "      options",
+      "    )",
+      "  );",
+      "  return observer;",
+      "};"
+    ],
+    "description": "Returns a new MutationObserver and runs the provided callback for each mutation on the specified element."
+  },
+  "off": {
+    "prefix": "30s_off",
+    "body": [
+      "const off = (el, evt, fn, opts = false) => el.removeEventListener(evt, fn, opts);"
+    ],
+    "description": "Removes an event listener from an element."
+  },
+  "offset": {
+    "prefix": "30s_offset",
+    "body": [
+      "const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];"
+    ],
+    "description": "Moves the specified amount of elements to the end of the array."
+  },
+  "omit": {
+    "prefix": "30s_omit",
+    "body": [
+      "const omit = (obj, arr) =>",
+      "  Object.keys(obj)",
+      "    .filter(k => !arr.includes(k))",
+      "    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});"
+    ],
+    "description": "Omits the key-value pairs corresponding to the given keys from an object."
+  },
+  "omitBy": {
+    "prefix": "30s_omitBy",
+    "body": [
+      "const omitBy = (obj, fn) =>",
+      "  Object.keys(obj)",
+      "    .filter(k => !fn(obj[k], k))",
+      "    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});"
+    ],
+    "description": "Creates an object composed of the properties the given function returns falsey for. The function is invoked with two arguments: (value, key)."
+  },
+  "on": {
+    "prefix": "30s_on",
+    "body": [
+      "const on = (el, evt, fn, opts = {}) => {",
+      "  const delegatorFn = e => e.target.matches(opts.target) && fn.call(e.target, e);",
+      "  el.addEventListener(evt, opts.target ? delegatorFn : fn, opts.options || false);",
+      "  if (opts.target) return delegatorFn;",
+      "};"
+    ],
+    "description": "Adds an event listener to an element with the ability to use event delegation."
+  },
+  "once": {
+    "prefix": "30s_once",
+    "body": [
+      "const once = fn => {",
+      "  let called = false;",
+      "  return function(...args) {",
+      "    if (called) return;",
+      "    called = true;",
+      "    return fn.apply(this, args);",
+      "  };",
+      "};"
+    ],
+    "description": "Ensures a function is called only once."
+  },
+  "onUserInputChange": {
+    "prefix": "30s_onUserInputChange",
+    "body": [
+      "const onUserInputChange = callback => {",
+      "  let type = 'mouse',",
+      "    lastTime = 0;",
+      "  const mousemoveHandler = () => {",
+      "    const now = performance.now();",
+      "    if (now - lastTime < 20)",
+      "      (type = 'mouse'), callback(type), document.removeEventListener('mousemove', mousemoveHandler);",
+      "    lastTime = now;",
+      "  };",
+      "  document.addEventListener('touchstart', () => {",
+      "    if (type === 'touch') return;",
+      "    (type = 'touch'), callback(type), document.addEventListener('mousemove', mousemoveHandler);",
+      "  });",
+      "};"
+    ],
+    "description": "Run the callback whenever the user input type changes (`mouse` or `touch`). Useful for enabling/disabling code depending on the input device. This process is dynamic and works with hybrid devices (e.g. touchscreen laptops)."
+  },
+  "orderBy": {
+    "prefix": "30s_orderBy",
+    "body": [
+      "const orderBy = (arr, props, orders) =>",
+      "  [...arr].sort((a, b) =>",
+      "    props.reduce((acc, prop, i) => {",
+      "      if (acc === 0) {",
+      "        const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];",
+      "        acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;",
+      "      }",
+      "      return acc;",
+      "    }, 0)",
+      "  );"
+    ],
+    "description": "Returns a sorted array of objects ordered by properties and orders."
+  },
+  "over": {
+    "prefix": "30s_over",
+    "body": [
+      "const over = (...fns) => (...args) => fns.map(fn => fn.apply(null, args));"
+    ],
+    "description": "Creates a function that invokes each provided function with the arguments it receives and returns the results."
+  },
+  "overArgs": {
+    "prefix": "30s_overArgs",
+    "body": [
+      "const overArgs = (fn, transforms) => (...args) => fn(...args.map((val, i) => transforms[i](val)));"
+    ],
+    "description": "Creates a function that invokes the provided function with its arguments transformed."
+  },
+  "pad": {
+    "prefix": "30s_pad",
+    "body": [
+      "const pad = (str, length, char = ' ') =>",
+      "  str.padStart((str.length + length) / 2, char).padEnd(length, char);"
+    ],
+    "description": "Pads a string on both sides with the specified character, if it's shorter than the specified length."
+  },
+  "palindrome": {
+    "prefix": "30s_palindrome",
+    "body": [
+      "const palindrome = str => {",
+      "  const s = str.toLowerCase().replace(/[\\W_]/g, '');",
+      "  return s === [...s].reverse().join('');",
+      "};"
+    ],
+    "description": "Returns `true` if the given string is a palindrome, `false` otherwise."
+  },
+  "parseCookie": {
+    "prefix": "30s_parseCookie",
+    "body": [
+      "const parseCookie = str =>",
+      "  str",
+      "    .split(';')",
+      "    .map(v => v.split('='))",
+      "    .reduce((acc, v) => {",
+      "      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());",
+      "      return acc;",
+      "    }, {});"
+    ],
+    "description": "Parse an HTTP Cookie header string and return an object of all cookie name-value pairs."
+  },
+  "partial": {
+    "prefix": "30s_partial",
+    "body": [
+      "const partial = (fn, ...partials) => (...args) => fn(...partials, ...args);"
+    ],
+    "description": "Creates a function that invokes `fn` with `partials` prepended to the arguments it receives."
+  },
+  "partialRight": {
+    "prefix": "30s_partialRight",
+    "body": [
+      "const partialRight = (fn, ...partials) => (...args) => fn(...args, ...partials);"
+    ],
+    "description": "Creates a function that invokes `fn` with `partials` appended to the arguments it receives."
+  },
+  "partition": {
+    "prefix": "30s_partition",
+    "body": [
+      "const partition = (arr, fn) =>",
+      "  arr.reduce(",
+      "    (acc, val, i, arr) => {",
+      "      acc[fn(val, i, arr) ? 0 : 1].push(val);",
+      "      return acc;",
+      "    },",
+      "    [[], []]",
+      "  );"
+    ],
+    "description": "Groups the elements into two arrays, depending on the provided function's truthiness for each element."
+  },
+  "percentile": {
+    "prefix": "30s_percentile",
+    "body": [
+      "const percentile = (arr, val) =>",
+      "  (100 * arr.reduce((acc, v) => acc + (v < val ? 1 : 0) + (v === val ? 0.5 : 0), 0)) / arr.length;"
+    ],
+    "description": "Uses the percentile formula to calculate how many numbers in the given array are less or equal to the given value."
+  },
+  "permutations": {
+    "prefix": "30s_permutations",
+    "body": [
+      "const permutations = arr => {",
+      "  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr;",
+      "  return arr.reduce(",
+      "    (acc, item, i) =>",
+      "      acc.concat(",
+      "        permutations([...arr.slice(0, i), ...arr.slice(i + 1)]).map(val => [item, ...val])",
+      "      ),",
+      "    []",
+      "  );",
+      "};"
+    ],
+    "description": "⚠️ **WARNING**: This function's execution time increases exponentially with each array element. Anything more than 8 to 10 entries will cause your browser to hang as it tries to solve all the different combinations."
+  },
+  "pick": {
+    "prefix": "30s_pick",
+    "body": [
+      "const pick = (obj, arr) =>",
+      "  arr.reduce((acc, curr) => (curr in obj && (acc[curr] = obj[curr]), acc), {});"
+    ],
+    "description": "Picks the key-value pairs corresponding to the given keys from an object."
+  },
+  "pickBy": {
+    "prefix": "30s_pickBy",
+    "body": [
+      "const pickBy = (obj, fn) =>",
+      "  Object.keys(obj)",
+      "    .filter(k => fn(obj[k], k))",
+      "    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});"
+    ],
+    "description": "Creates an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key)."
+  },
+  "pipeAsyncFunctions": {
+    "prefix": "30s_pipeAsyncFunctions",
+    "body": [
+      "const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));"
+    ],
+    "description": "Performs left-to-right function composition for asynchronous functions."
+  },
+  "pipeFunctions": {
+    "prefix": "30s_pipeFunctions",
+    "body": [
+      "const pipeFunctions = (...fns) => fns.reduce((f, g) => (...args) => g(f(...args)));"
+    ],
+    "description": "Performs left-to-right function composition."
+  },
+  "pluralize": {
+    "prefix": "30s_pluralize",
+    "body": [
+      "const pluralize = (val, word, plural = word + 's') => {",
+      "  const _pluralize = (num, word, plural = word + 's') =>",
+      "    [1, -1].includes(Number(num)) ? word : plural;",
+      "  if (typeof val === 'object') return (num, word) => _pluralize(num, word, val[word]);",
+      "  return _pluralize(val, word, plural);",
+      "};"
+    ],
+    "description": "Returns the singular or plural form of the word based on the input number. If the first argument is an `object`, it will use a closure by returning a function that can auto-pluralize words that don't simply end in `s` if the supplied dictionary contains the word."
+  },
+  "powerset": {
+    "prefix": "30s_powerset",
+    "body": [
+      "const powerset = arr => arr.reduce((a, v) => a.concat(a.map(r => [v].concat(r))), [[]]);"
+    ],
+    "description": "Returns the powerset of a given array of numbers."
+  },
+  "prefix": {
+    "prefix": "30s_prefix",
+    "body": [
+      "const prefix = prop => {",
+      "  const capitalizedProp = prop.charAt(0).toUpperCase() + prop.slice(1);",
+      "  const prefixes = ['', 'webkit', 'moz', 'ms', 'o'];",
+      "  const i = prefixes.findIndex(",
+      "    prefix => typeof document.body.style[prefix ? prefix + capitalizedProp : prop] !== 'undefined'",
+      "  );",
+      "  return i !== -1 ? (i === 0 ? prop : prefixes[i] + capitalizedProp) : null;",
+      "};"
+    ],
+    "description": "Returns the prefixed version (if necessary) of a CSS property that the browser supports."
+  },
+  "prettyBytes": {
+    "prefix": "30s_prettyBytes",
+    "body": [
+      "const prettyBytes = (num, precision = 3, addSpace = true) => {",
+      "  const UNITS = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];",
+      "  if (Math.abs(num) < 1) return num + (addSpace ? ' ' : '') + UNITS[0];",
+      "  const exponent = Math.min(Math.floor(Math.log10(num < 0 ? -num : num) / 3), UNITS.length - 1);",
+      "  const n = Number(((num < 0 ? -num : num) / 1000 ** exponent).toPrecision(precision));",
+      "  return (num < 0 ? '-' : '') + n + (addSpace ? ' ' : '') + UNITS[exponent];",
+      "};"
+    ],
+    "description": "Converts a number in bytes to a human-readable string."
+  },
+  "primes": {
+    "prefix": "30s_primes",
+    "body": [
+      "const primes = num => {",
+      "  let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),",
+      "    sqroot = Math.floor(Math.sqrt(num)),",
+      "    numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);",
+      "  numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y === x)));",
+      "  return arr;",
+      "};"
+    ],
+    "description": "Generates primes up to a given number, using the Sieve of Eratosthenes."
+  },
+  "promisify": {
+    "prefix": "30s_promisify",
+    "body": [
+      "const promisify = func => (...args) =>",
+      "  new Promise((resolve, reject) =>",
+      "    func(...args, (err, result) => (err ? reject(err) : resolve(result)))",
+      "  );"
+    ],
+    "description": "Converts an asynchronous function to return a promise."
+  },
+  "pull": {
+    "prefix": "30s_pull",
+    "body": [
+      "const pull = (arr, ...args) => {",
+      "  let argState = Array.isArray(args[0]) ? args[0] : args;",
+      "  let pulled = arr.filter((v, i) => !argState.includes(v));",
+      "  arr.length = 0;",
+      "  pulled.forEach(v => arr.push(v));",
+      "};"
+    ],
+    "description": "Mutates the original array to filter out the values specified."
+  },
+  "pullAtIndex": {
+    "prefix": "30s_pullAtIndex",
+    "body": [
+      "const pullAtIndex = (arr, pullArr) => {",
+      "  let removed = [];",
+      "  let pulled = arr",
+      "    .map((v, i) => (pullArr.includes(i) ? removed.push(v) : v))",
+      "    .filter((v, i) => !pullArr.includes(i));",
+      "  arr.length = 0;",
+      "  pulled.forEach(v => arr.push(v));",
+      "  return removed;",
+      "};"
+    ],
+    "description": "Mutates the original array to filter out the values at the specified indexes."
+  },
+  "pullAtValue": {
+    "prefix": "30s_pullAtValue",
+    "body": [
+      "const pullAtValue = (arr, pullArr) => {",
+      "  let removed = [],",
+      "    pushToRemove = arr.forEach((v, i) => (pullArr.includes(v) ? removed.push(v) : v)),",
+      "    mutateTo = arr.filter((v, i) => !pullArr.includes(v));",
+      "  arr.length = 0;",
+      "  mutateTo.forEach(v => arr.push(v));",
+      "  return removed;",
+      "};"
+    ],
+    "description": "Mutates the original array to filter out the values specified. Returns the removed elements."
+  },
+  "pullBy": {
+    "prefix": "30s_pullBy",
+    "body": [
+      "const pullBy = (arr, ...args) => {",
+      "  const length = args.length;",
+      "  let fn = length > 1 ? args[length - 1] : undefined;",
+      "  fn = typeof fn == 'function' ? (args.pop(), fn) : undefined;",
+      "  let argState = (Array.isArray(args[0]) ? args[0] : args).map(val => fn(val));",
+      "  let pulled = arr.filter((v, i) => !argState.includes(fn(v)));",
+      "  arr.length = 0;",
+      "  pulled.forEach(v => arr.push(v));",
+      "};"
+    ],
+    "description": "Mutates the original array to filter out the values specified, based on a given iterator function."
+  },
+  "radsToDegrees": {
+    "prefix": "30s_radsToDegrees",
+    "body": [
+      "const radsToDegrees = rad => (rad * 180.0) / Math.PI;"
+    ],
+    "description": "Converts an angle from radians to degrees."
+  },
+  "randomHexColorCode": {
+    "prefix": "30s_randomHexColorCode",
+    "body": [
+      "const randomHexColorCode = () => {",
+      "  let n = (Math.random() * 0xfffff * 1000000).toString(16);",
+      "  return '#' + n.slice(0, 6);",
+      "};"
+    ],
+    "description": "Generates a random hexadecimal color code."
+  },
+  "randomIntArrayInRange": {
+    "prefix": "30s_randomIntArrayInRange",
+    "body": [
+      "const randomIntArrayInRange = (min, max, n = 1) =>",
+      "  Array.from({ length: n }, () => Math.floor(Math.random() * (max - min + 1)) + min);"
+    ],
+    "description": "Returns an array of n random integers in the specified range."
+  },
+  "randomIntegerInRange": {
+    "prefix": "30s_randomIntegerInRange",
+    "body": [
+      "const randomIntegerInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;"
+    ],
+    "description": "Returns a random integer in the specified range."
+  },
+  "randomNumberInRange": {
+    "prefix": "30s_randomNumberInRange",
+    "body": [
+      "const randomNumberInRange = (min, max) => Math.random() * (max - min) + min;"
+    ],
+    "description": "Returns a random number in the specified range."
+  },
+  "readFileLines": {
+    "prefix": "30s_readFileLines",
+    "body": [
+      "const fs = require('fs');",
+      "const readFileLines = filename =>",
+      "  fs",
+      "    .readFileSync(filename)",
+      "    .toString('UTF8')",
+      "    .split('\\n');"
+    ],
+    "description": "Returns an array of lines from the specified file."
+  },
+  "rearg": {
+    "prefix": "30s_rearg",
+    "body": [
+      "const rearg = (fn, indexes) => (...args) => fn(...indexes.map(i => args[i]));"
+    ],
+    "description": "Creates a function that invokes the provided function with its arguments arranged according to the specified indexes."
+  },
+  "recordAnimationFrames": {
+    "prefix": "30s_recordAnimationFrames",
+    "body": [
+      "const recordAnimationFrames = (callback, autoStart = true) => {",
+      "  let running = true,",
+      "    raf;",
+      "  const stop = () => {",
+      "    running = false;",
+      "    cancelAnimationFrame(raf);",
+      "  };",
+      "  const start = () => {",
+      "    running = true;",
+      "    run();",
+      "  };",
+      "  const run = () => {",
+      "    raf = requestAnimationFrame(() => {",
+      "      callback();",
+      "      if (running) run();",
+      "    });",
+      "  };",
+      "  if (autoStart) start();",
+      "  return { start, stop };",
+      "};"
+    ],
+    "description": "Invokes the provided callback on each animation frame."
+  },
+  "redirect": {
+    "prefix": "30s_redirect",
+    "body": [
+      "const redirect = (url, asLink = true) =>",
+      "  asLink ? (window.location.href = url) : window.location.replace(url);"
+    ],
+    "description": "Redirects to a specified URL."
+  },
+  "reducedFilter": {
+    "prefix": "30s_reducedFilter",
+    "body": [
+      "const reducedFilter = (data, keys, fn) =>",
+      "  data.filter(fn).map(el =>",
+      "    keys.reduce((acc, key) => {",
+      "      acc[key] = el[key];",
+      "      return acc;",
+      "    }, {})",
+      "  );"
+    ],
+    "description": "Filter an array of objects based on a condition while also filtering out unspecified keys."
+  },
+  "reduceSuccessive": {
+    "prefix": "30s_reduceSuccessive",
+    "body": [
+      "const reduceSuccessive = (arr, fn, acc) =>",
+      "  arr.reduce((res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res), [acc]);"
+    ],
+    "description": "Applies a function against an accumulator and each element in the array (from left to right), returning an array of successively reduced values."
+  },
+  "reduceWhich": {
+    "prefix": "30s_reduceWhich",
+    "body": [
+      "const reduceWhich = (arr, comparator = (a, b) => a - b) =>",
+      "  arr.reduce((a, b) => (comparator(a, b) >= 0 ? b : a));"
+    ],
+    "description": "Returns the minimum/maximum value of an array, after applying the provided function to set comparing rule."
+  },
+  "reject": {
+    "prefix": "30s_reject",
+    "body": [
+      "const reject = (pred, array) => array.filter((...args) => !pred(...args));"
+    ],
+    "description": "Takes a predicate and array, like `Array.prototype.filter()`, but only keeps `x` if `pred(x) === false`"
+  },
+  "remove": {
+    "prefix": "30s_remove",
+    "body": [
+      "const remove = (arr, func) =>",
+      "  Array.isArray(arr)",
+      "    ? arr.filter(func).reduce((acc, val) => {",
+      "      arr.splice(arr.indexOf(val), 1);",
+      "      return acc.concat(val);",
+      "    }, [])",
+      "    : [];"
+    ],
+    "description": "Removes elements from an array for which the given function returns `false`."
+  },
+  "removeNonASCII": {
+    "prefix": "30s_removeNonASCII",
+    "body": [
+      "const removeNonASCII = str => str.replace(/[^\\x20-\\x7E]/g, '');"
+    ],
+    "description": "Removes non-printable ASCII characters."
+  },
+  "renameKeys": {
+    "prefix": "30s_renameKeys",
+    "body": [
+      "const renameKeys = (keysMap, obj) =>",
+      "  Object.keys(obj).reduce(",
+      "    (acc, key) => ({",
+      "      ...acc,",
+      "      ...{ [keysMap[key] || key]: obj[key] }",
+      "    }),",
+      "    {}",
+      "  );"
+    ],
+    "description": "Replaces the names of multiple object keys with the values provided."
+  },
+  "reverseString": {
+    "prefix": "30s_reverseString",
+    "body": [
+      "const reverseString = str => [...str].reverse().join('');"
+    ],
+    "description": "Reverses a string."
+  },
+  "RGBToHex": {
+    "prefix": "30s_RGBToHex",
+    "body": [
+      "const RGBToHex = (r, g, b) => ((r << 16) + (g << 8) + b).toString(16).padStart(6, '0');"
+    ],
+    "description": "Converts the values of RGB components to a color code."
+  },
+  "round": {
+    "prefix": "30s_round",
+    "body": [
+      "const round = (n, decimals = 0) => Number(`${Math.round(`${n}e${decimals}`)}e-${decimals}`);"
+    ],
+    "description": "Rounds a number to a specified amount of digits."
+  },
+  "runAsync": {
+    "prefix": "30s_runAsync",
+    "body": [
+      "const runAsync = fn => {",
+      "  const worker = new Worker(",
+      "    URL.createObjectURL(new Blob([`postMessage((${fn})());`]), {",
+      "      type: 'application/javascript; charset=utf-8'",
+      "    })",
+      "  );",
+      "  return new Promise((res, rej) => {",
+      "    worker.onmessage = ({ data }) => {",
+      "      res(data), worker.terminate();",
+      "    };",
+      "    worker.onerror = err => {",
+      "      rej(err), worker.terminate();",
+      "    };",
+      "  });",
+      "};"
+    ],
+    "description": "Runs a function in a separate thread by using a [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers), allowing long running functions to not block the UI."
+  },
+  "runPromisesInSeries": {
+    "prefix": "30s_runPromisesInSeries",
+    "body": [
+      "const runPromisesInSeries = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());"
+    ],
+    "description": "Runs an array of promises in series."
+  },
+  "sample": {
+    "prefix": "30s_sample",
+    "body": [
+      "const sample = arr => arr[Math.floor(Math.random() * arr.length)];"
+    ],
+    "description": "Returns a random element from an array."
+  },
+  "sampleSize": {
+    "prefix": "30s_sampleSize",
+    "body": [
+      "const sampleSize = ([...arr], n = 1) => {",
+      "  let m = arr.length;",
+      "  while (m) {",
+      "    const i = Math.floor(Math.random() * m--);",
+      "    [arr[m], arr[i]] = [arr[i], arr[m]];",
+      "  }",
+      "  return arr.slice(0, n);",
+      "};"
+    ],
+    "description": "Gets `n` random elements at unique keys from `array` up to the size of `array`."
+  },
+  "scrollToTop": {
+    "prefix": "30s_scrollToTop",
+    "body": [
+      "const scrollToTop = () => {",
+      "  const c = document.documentElement.scrollTop || document.body.scrollTop;",
+      "  if (c > 0) {",
+      "    window.requestAnimationFrame(scrollToTop);",
+      "    window.scrollTo(0, c - c / 8);",
+      "  }",
+      "};"
+    ],
+    "description": "Smooth-scrolls to the top of the page."
+  },
+  "sdbm": {
+    "prefix": "30s_sdbm",
+    "body": [
+      "const sdbm = str => {",
+      "  let arr = str.split('');",
+      "  return arr.reduce(",
+      "    (hashCode, currentVal) =>",
+      "      (hashCode = currentVal.charCodeAt(0) + (hashCode << 6) + (hashCode << 16) - hashCode),",
+      "    0",
+      "  );",
+      "};"
+    ],
+    "description": "Hashes the input string into a whole number."
+  },
+  "serializeCookie": {
+    "prefix": "30s_serializeCookie",
+    "body": [
+      "const serializeCookie = (name, val) => `${encodeURIComponent(name)}=${encodeURIComponent(val)}`;"
+    ],
+    "description": "Serialize a cookie name-value pair into a Set-Cookie header string."
+  },
+  "setStyle": {
+    "prefix": "30s_setStyle",
+    "body": [
+      "const setStyle = (el, ruleName, val) => (el.style[ruleName] = val);"
+    ],
+    "description": "Sets the value of a CSS rule for the specified element."
+  },
+  "shallowClone": {
+    "prefix": "30s_shallowClone",
+    "body": [
+      "const shallowClone = obj => Object.assign({}, obj);"
+    ],
+    "description": "Creates a shallow clone of an object."
+  },
+  "shank": {
+    "prefix": "30s_shank",
+    "body": [
+      "const shank = (arr, index = 0, delCount = 0, ...elements) =>",
+      "  arr",
+      "    .slice(0, index)",
+      "    .concat(elements)",
+      "    .concat(arr.slice(index + delCount));"
+    ],
+    "description": "Has the same functionality as [`Array.prototype.prototype.splice()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice), but returning a new array instead of mutating the original array."
+  },
+  "show": {
+    "prefix": "30s_show",
+    "body": [
+      "const show = (...el) => [...el].forEach(e => (e.style.display = ''));"
+    ],
+    "description": "Shows all the elements specified."
+  },
+  "shuffle": {
+    "prefix": "30s_shuffle",
+    "body": [
+      "const shuffle = ([...arr]) => {",
+      "  let m = arr.length;",
+      "  while (m) {",
+      "    const i = Math.floor(Math.random() * m--);",
+      "    [arr[m], arr[i]] = [arr[i], arr[m]];",
+      "  }",
+      "  return arr;",
+      "};"
+    ],
+    "description": "Randomizes the order of the values of an array, returning a new array."
+  },
+  "similarity": {
+    "prefix": "30s_similarity",
+    "body": [
+      "const similarity = (arr, values) => arr.filter(v => values.includes(v));"
+    ],
+    "description": "Returns an array of elements that appear in both arrays."
+  },
+  "size": {
+    "prefix": "30s_size",
+    "body": [
+      "const size = val =>",
+      "  Array.isArray(val)",
+      "    ? val.length",
+      "    : val && typeof val === 'object'",
+      "      ? val.size || val.length || Object.keys(val).length",
+      "      : typeof val === 'string'",
+      "        ? new Blob([val]).size",
+      "        : 0;"
+    ],
+    "description": "Get size of arrays, objects or strings."
+  },
+  "sleep": {
+    "prefix": "30s_sleep",
+    "body": [
+      "const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));"
+    ],
+    "description": "Delays the execution of an asynchronous function."
+  },
+  "smoothScroll": {
+    "prefix": "30s_smoothScroll",
+    "body": [
+      "const smoothScroll = element =>",
+      "  document.querySelector(element).scrollIntoView({",
+      "    behavior: 'smooth'",
+      "  });"
+    ],
+    "description": "Smoothly scrolls the element on which it's called into the visible area of the browser window."
+  },
+  "sortCharactersInString": {
+    "prefix": "30s_sortCharactersInString",
+    "body": [
+      "const sortCharactersInString = str => [...str].sort((a, b) => a.localeCompare(b)).join('');"
+    ],
+    "description": "Alphabetically sorts the characters in a string."
+  },
+  "sortedIndex": {
+    "prefix": "30s_sortedIndex",
+    "body": [
+      "const sortedIndex = (arr, n) => {",
+      "  const isDescending = arr[0] > arr[arr.length - 1];",
+      "  const index = arr.findIndex(el => (isDescending ? n >= el : n <= el));",
+      "  return index === -1 ? arr.length : index;",
+      "};"
+    ],
+    "description": "Returns the lowest index at which value should be inserted into array in order to maintain its sort order."
+  },
+  "sortedIndexBy": {
+    "prefix": "30s_sortedIndexBy",
+    "body": [
+      "const sortedIndexBy = (arr, n, fn) => {",
+      "  const isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);",
+      "  const val = fn(n);",
+      "  const index = arr.findIndex(el => (isDescending ? val >= fn(el) : val <= fn(el)));",
+      "  return index === -1 ? arr.length : index;",
+      "};"
+    ],
+    "description": "Returns the lowest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function."
+  },
+  "sortedLastIndex": {
+    "prefix": "30s_sortedLastIndex",
+    "body": [
+      "const sortedLastIndex = (arr, n) => {",
+      "  const isDescending = arr[0] > arr[arr.length - 1];",
+      "  const index = arr.reverse().findIndex(el => (isDescending ? n <= el : n >= el));",
+      "  return index === -1 ? 0 : arr.length - index;",
+      "};"
+    ],
+    "description": "Returns the highest index at which value should be inserted into array in order to maintain its sort order."
+  },
+  "sortedLastIndexBy": {
+    "prefix": "30s_sortedLastIndexBy",
+    "body": [
+      "const sortedLastIndexBy = (arr, n, fn) => {",
+      "  const isDescending = fn(arr[0]) > fn(arr[arr.length - 1]);",
+      "  const val = fn(n);",
+      "  const index = arr",
+      "    .map(fn)",
+      "    .reverse()",
+      "    .findIndex(el => (isDescending ? val <= el : val >= el));",
+      "  return index === -1 ? 0 : arr.length - index;",
+      "};"
+    ],
+    "description": "Returns the highest index at which value should be inserted into array in order to maintain its sort order, based on a provided iterator function."
+  },
+  "splitLines": {
+    "prefix": "30s_splitLines",
+    "body": [
+      "const splitLines = str => str.split(/\\r?\\n/);"
+    ],
+    "description": "Splits a multiline string into an array of lines."
+  },
+  "spreadOver": {
+    "prefix": "30s_spreadOver",
+    "body": [
+      "const spreadOver = fn => argsArr => fn(...argsArr);"
+    ],
+    "description": "Takes a variadic function and returns a closure that accepts an array of arguments to map to the inputs of the function."
+  },
+  "stableSort": {
+    "prefix": "30s_stableSort",
+    "body": [
+      "const stableSort = (arr, compare) =>",
+      "  arr",
+      "    .map((item, index) => ({ item, index }))",
+      "    .sort((a, b) => compare(a.item, b.item) || a.index - b.index)",
+      "    .map(({ item }) => item);"
+    ],
+    "description": "Performs stable sorting of an array, preserving the initial indexes of items when their values are the same.\r\nDoes not mutate the original array, but returns a new array instead."
+  },
+  "standardDeviation": {
+    "prefix": "30s_standardDeviation",
+    "body": [
+      "const standardDeviation = (arr, usePopulation = false) => {",
+      "  const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;",
+      "  return Math.sqrt(",
+      "    arr.reduce((acc, val) => acc.concat((val - mean) ** 2), []).reduce((acc, val) => acc + val, 0) /",
+      "      (arr.length - (usePopulation ? 0 : 1))",
+      "  );",
+      "};"
+    ],
+    "description": "Returns the standard deviation of an array of numbers."
+  },
+  "stringPermutations": {
+    "prefix": "30s_stringPermutations",
+    "body": [
+      "const stringPermutations = str => {",
+      "  if (str.length <= 2) return str.length === 2 ? [str, str[1] + str[0]] : [str];",
+      "  return str",
+      "    .split('')",
+      "    .reduce(",
+      "      (acc, letter, i) =>",
+      "        acc.concat(stringPermutations(str.slice(0, i) + str.slice(i + 1)).map(val => letter + val)),",
+      "      []",
+      "    );",
+      "};"
+    ],
+    "description": "⚠️ **WARNING**: This function's execution time increases exponentially with each character. Anything more than 8 to 10 characters will cause your browser to hang as it tries to solve all the different combinations."
+  },
+  "stripHTMLTags": {
+    "prefix": "30s_stripHTMLTags",
+    "body": [
+      "const stripHTMLTags = str => str.replace(/<[^>]*>/g, '');"
+    ],
+    "description": "Removes HTML/XML tags from string."
+  },
+  "sum": {
+    "prefix": "30s_sum",
+    "body": [
+      "const sum = (...arr) => [...arr].reduce((acc, val) => acc + val, 0);"
+    ],
+    "description": "Returns the sum of two or more numbers/arrays."
+  },
+  "sumBy": {
+    "prefix": "30s_sumBy",
+    "body": [
+      "const sumBy = (arr, fn) =>",
+      "  arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val) => acc + val, 0);"
+    ],
+    "description": "Returns the sum of an array, after mapping each element to a value using the provided function."
+  },
+  "sumPower": {
+    "prefix": "30s_sumPower",
+    "body": [
+      "const sumPower = (end, power = 2, start = 1) =>",
+      "  Array(end + 1 - start)",
+      "    .fill(0)",
+      "    .map((x, i) => (i + start) ** power)",
+      "    .reduce((a, b) => a + b, 0);"
+    ],
+    "description": "Returns the sum of the powers of all the numbers from `start` to `end` (both inclusive)."
+  },
+  "symmetricDifference": {
+    "prefix": "30s_symmetricDifference",
+    "body": [
+      "const symmetricDifference = (a, b) => {",
+      "  const sA = new Set(a),",
+      "    sB = new Set(b);",
+      "  return [...a.filter(x => !sB.has(x)), ...b.filter(x => !sA.has(x))];",
+      "};"
+    ],
+    "description": "Returns the symmetric difference between two arrays, without filtering out duplicate values."
+  },
+  "symmetricDifferenceBy": {
+    "prefix": "30s_symmetricDifferenceBy",
+    "body": [
+      "const symmetricDifferenceBy = (a, b, fn) => {",
+      "  const sA = new Set(a.map(v => fn(v))),",
+      "    sB = new Set(b.map(v => fn(v)));",
+      "  return [...a.filter(x => !sB.has(fn(x))), ...b.filter(x => !sA.has(fn(x)))];",
+      "};"
+    ],
+    "description": "Returns the symmetric difference between two arrays, after applying the provided function to each array element of both."
+  },
+  "symmetricDifferenceWith": {
+    "prefix": "30s_symmetricDifferenceWith",
+    "body": [
+      "const symmetricDifferenceWith = (arr, val, comp) => [",
+      "  ...arr.filter(a => val.findIndex(b => comp(a, b)) === -1),",
+      "  ...val.filter(a => arr.findIndex(b => comp(a, b)) === -1)",
+      "];"
+    ],
+    "description": "Returns the symmetric difference between two arrays, using a provided function as a comparator."
+  },
+  "tail": {
+    "prefix": "30s_tail",
+    "body": [
+      "const tail = arr => (arr.length > 1 ? arr.slice(1) : arr);"
+    ],
+    "description": "Returns all elements in an array except for the first one."
+  },
+  "take": {
+    "prefix": "30s_take",
+    "body": [
+      "const take = (arr, n = 1) => arr.slice(0, n);"
+    ],
+    "description": "Returns an array with n elements removed from the beginning."
+  },
+  "takeRight": {
+    "prefix": "30s_takeRight",
+    "body": [
+      "const takeRight = (arr, n = 1) => arr.slice(arr.length - n, arr.length);"
+    ],
+    "description": "Returns an array with n elements removed from the end."
+  },
+  "takeRightWhile": {
+    "prefix": "30s_takeRightWhile",
+    "body": [
+      "const takeRightWhile = (arr, func) =>",
+      "  arr.reduceRight((acc, el) => (func(el) ? acc : [el, ...acc]), []);"
+    ],
+    "description": "Removes elements from the end of an array until the passed function returns `true`. Returns the removed elements."
+  },
+  "takeWhile": {
+    "prefix": "30s_takeWhile",
+    "body": [
+      "const takeWhile = (arr, func) => {",
+      "  for (const [i, val] of arr.entries()) if (func(val)) return arr.slice(0, i);",
+      "  return arr;",
+      "};"
+    ],
+    "description": "Removes elements in an array until the passed function returns `true`. Returns the removed elements."
+  },
+  "throttle": {
+    "prefix": "30s_throttle",
+    "body": [
+      "const throttle = (fn, wait) => {",
+      "  let inThrottle, lastFn, lastTime;",
+      "  return function() {",
+      "    const context = this,",
+      "      args = arguments;",
+      "    if (!inThrottle) {",
+      "      fn.apply(context, args);",
+      "      lastTime = Date.now();",
+      "      inThrottle = true;",
+      "    } else {",
+      "      clearTimeout(lastFn);",
+      "      lastFn = setTimeout(function() {",
+      "        if (Date.now() - lastTime >= wait) {",
+      "          fn.apply(context, args);",
+      "          lastTime = Date.now();",
+      "        }",
+      "      }, Math.max(wait - (Date.now() - lastTime), 0));",
+      "    }",
+      "  };",
+      "};"
+    ],
+    "description": "Creates a throttled function that only invokes the provided function at most once per every `wait` milliseconds"
+  },
+  "times": {
+    "prefix": "30s_times",
+    "body": [
+      "const times = (n, fn, context = undefined) => {",
+      "  let i = 0;",
+      "  while (fn.call(context, i) !== false && ++i < n) {}",
+      "};"
+    ],
+    "description": "Iterates over a callback `n` times"
+  },
+  "timeTaken": {
+    "prefix": "30s_timeTaken",
+    "body": [
+      "const timeTaken = callback => {",
+      "  console.time('timeTaken');",
+      "  const r = callback();",
+      "  console.timeEnd('timeTaken');",
+      "  return r;",
+      "};"
+    ],
+    "description": "Measures the time taken by a function to execute."
+  },
+  "toCamelCase": {
+    "prefix": "30s_toCamelCase",
+    "body": [
+      "const toCamelCase = str => {",
+      "  let s =",
+      "    str &&",
+      "    str",
+      "      .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)",
+      "      .map(x => x.slice(0, 1).toUpperCase() + x.slice(1).toLowerCase())",
+      "      .join('');",
+      "  return s.slice(0, 1).toLowerCase() + s.slice(1);",
+      "};"
+    ],
+    "description": "Converts a string to camelcase."
+  },
+  "toCurrency": {
+    "prefix": "30s_toCurrency",
+    "body": [
+      "const toCurrency = (n, curr, LanguageFormat = undefined) =>",
+      "  Intl.NumberFormat(LanguageFormat, { style: 'currency', currency: curr }).format(n);"
+    ],
+    "description": "Take a number and return specified currency formatting."
+  },
+  "toDecimalMark": {
+    "prefix": "30s_toDecimalMark",
+    "body": [
+      "const toDecimalMark = num => num.toLocaleString('en-US');"
+    ],
+    "description": "Use `toLocaleString()` to convert a float-point arithmetic to the [Decimal mark](https://en.wikipedia.org/wiki/Decimal_mark) form. It makes a comma separated string from a number"
+  },
+  "toggleClass": {
+    "prefix": "30s_toggleClass",
+    "body": [
+      "const toggleClass = (el, className) => el.classList.toggle(className);"
+    ],
+    "description": "Toggle a class for an element."
+  },
+  "toHash": {
+    "prefix": "30s_toHash",
+    "body": [
+      "const toHash = (object, key) =>",
+      "  Array.prototype.reduce.call(",
+      "    object,",
+      "    (acc, data, index) => ((acc[!key ? index : data[key]] = data), acc),",
+      "    {}",
+      "  );"
+    ],
+    "description": "Reduces a given Array-like into a value hash (keyed data store)."
+  },
+  "toKebabCase": {
+    "prefix": "30s_toKebabCase",
+    "body": [
+      "const toKebabCase = str =>",
+      "  str &&",
+      "  str",
+      "    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)",
+      "    .map(x => x.toLowerCase())",
+      "    .join('-');"
+    ],
+    "description": "Converts a string to kebab case."
+  },
+  "tomorrow": {
+    "prefix": "30s_tomorrow",
+    "body": [
+      "const tomorrow = (long = false) => {",
+      "  let t = new Date();",
+      "  t.setDate(t.getDate() + 1);",
+      "  const ret = `${t.getFullYear()}-${String(t.getMonth() + 1).padStart(2, '0')}-${String(",
+      "    t.getDate()",
+      "  ).padStart(2, '0')}`;",
+      "  return !long ? ret : `${ret}T00:00:00`;",
+      "};"
+    ],
+    "description": "Results in a string representation of tomorrow's date."
+  },
+  "toOrdinalSuffix": {
+    "prefix": "30s_toOrdinalSuffix",
+    "body": [
+      "const toOrdinalSuffix = num => {",
+      "  const int = parseInt(num),",
+      "    digits = [int % 10, int % 100],",
+      "    ordinals = ['st', 'nd', 'rd', 'th'],",
+      "    oPattern = [1, 2, 3, 4],",
+      "    tPattern = [11, 12, 13, 14, 15, 16, 17, 18, 19];",
+      "  return oPattern.includes(digits[0]) && !tPattern.includes(digits[1])",
+      "    ? int + ordinals[digits[0] - 1]",
+      "    : int + ordinals[3];",
+      "};"
+    ],
+    "description": "Adds an ordinal suffix to a number."
+  },
+  "toSafeInteger": {
+    "prefix": "30s_toSafeInteger",
+    "body": [
+      "const toSafeInteger = num =>",
+      "  Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));"
+    ],
+    "description": "Converts a value to a safe integer."
+  },
+  "toSnakeCase": {
+    "prefix": "30s_toSnakeCase",
+    "body": [
+      "const toSnakeCase = str =>",
+      "  str &&",
+      "  str",
+      "    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)",
+      "    .map(x => x.toLowerCase())",
+      "    .join('_');"
+    ],
+    "description": "Converts a string to snake case."
+  },
+  "toTitleCase": {
+    "prefix": "30s_toTitleCase",
+    "body": [
+      "const toTitleCase = str =>",
+      "  str",
+      "    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)",
+      "    .map(x => x.charAt(0).toUpperCase() + x.slice(1))",
+      "    .join(' ');"
+    ],
+    "description": "Converts a string to title case."
+  },
+  "transform": {
+    "prefix": "30s_transform",
+    "body": [
+      "const transform = (obj, fn, acc) => Object.keys(obj).reduce((a, k) => fn(a, obj[k], k, obj), acc);"
+    ],
+    "description": "Applies a function against an accumulator and each key in the object (from left to right)."
+  },
+  "triggerEvent": {
+    "prefix": "30s_triggerEvent",
+    "body": [
+      "const triggerEvent = (el, eventType, detail) =>",
+      "  el.dispatchEvent(new CustomEvent(eventType, { detail }));"
+    ],
+    "description": "Triggers a specific event on a given element, optionally passing custom data."
+  },
+  "truncateString": {
+    "prefix": "30s_truncateString",
+    "body": [
+      "const truncateString = (str, num) =>",
+      "  str.length > num ? str.slice(0, num > 3 ? num - 3 : num) + '...' : str;"
+    ],
+    "description": "Truncates a string up to a specified length."
+  },
+  "truthCheckCollection": {
+    "prefix": "30s_truthCheckCollection",
+    "body": [
+      "const truthCheckCollection = (collection, pre) => collection.every(obj => obj[pre]);"
+    ],
+    "description": "Checks if the predicate (second argument) is truthy on all elements of a collection (first argument)."
+  },
+  "unary": {
+    "prefix": "30s_unary",
+    "body": [
+      "const unary = fn => val => fn(val);"
+    ],
+    "description": "Creates a function that accepts up to one argument, ignoring any additional arguments."
+  },
+  "uncurry": {
+    "prefix": "30s_uncurry",
+    "body": [
+      "const uncurry = (fn, n = 1) => (...args) => {",
+      "  const next = acc => args => args.reduce((x, y) => x(y), acc);",
+      "  if (n > args.length) throw new RangeError('Arguments too few!');",
+      "  return next(fn)(args.slice(0, n));",
+      "};"
+    ],
+    "description": "Uncurries a function up to depth `n`."
+  },
+  "unescapeHTML": {
+    "prefix": "30s_unescapeHTML",
+    "body": [
+      "const unescapeHTML = str =>",
+      "  str.replace(",
+      "    /&amp;|&lt;|&gt;|&#39;|&quot;/g,",
+      "    tag =>",
+      "      ({",
+      "        '&amp;': '&',",
+      "        '&lt;': '<',",
+      "        '&gt;': '>',",
+      "        '&#39;': \"'\",",
+      "        '&quot;': '\"'",
+      "      }[tag] || tag)",
+      "  );"
+    ],
+    "description": "Unescapes escaped HTML characters."
+  },
+  "unflattenObject": {
+    "prefix": "30s_unflattenObject",
+    "body": [
+      "const unflattenObject = obj =>",
+      "  Object.keys(obj).reduce((acc, k) => {",
+      "    if (k.indexOf('.') !== -1) {",
+      "      const keys = k.split('.');",
+      "      Object.assign(",
+      "        acc,",
+      "        JSON.parse(",
+      "          '{' +",
+      "            keys.map((v, i) => (i !== keys.length - 1 ? `\"${v}\":{` : `\"${v}\":`)).join('') +",
+      "            obj[k] +",
+      "            '}'.repeat(keys.length)",
+      "        )",
+      "      );",
+      "    } else acc[k] = obj[k];",
+      "    return acc;",
+      "  }, {});"
+    ],
+    "description": "Unflatten an object with the paths for keys."
+  },
+  "unfold": {
+    "prefix": "30s_unfold",
+    "body": [
+      "const unfold = (fn, seed) => {",
+      "  let result = [],",
+      "    val = [null, seed];",
+      "  while ((val = fn(val[1]))) result.push(val[0]);",
+      "  return result;",
+      "};"
+    ],
+    "description": "Builds an array, using an iterator function and an initial seed value."
+  },
+  "union": {
+    "prefix": "30s_union",
+    "body": [
+      "const union = (a, b) => Array.from(new Set([...a, ...b]));"
+    ],
+    "description": "Returns every element that exists in any of the two arrays once."
+  },
+  "unionBy": {
+    "prefix": "30s_unionBy",
+    "body": [
+      "const unionBy = (a, b, fn) => {",
+      "  const s = new Set(a.map(fn));",
+      "  return Array.from(new Set([...a, ...b.filter(x => !s.has(fn(x)))]));",
+      "};"
+    ],
+    "description": "Returns every element that exists in any of the two arrays once, after applying the provided function to each array element of both."
+  },
+  "unionWith": {
+    "prefix": "30s_unionWith",
+    "body": [
+      "const unionWith = (a, b, comp) =>",
+      "  Array.from(new Set([...a, ...b.filter(x => a.findIndex(y => comp(x, y)) === -1)]));"
+    ],
+    "description": "Returns every element that exists in any of the two arrays once, using a provided comparator function."
+  },
+  "uniqueElements": {
+    "prefix": "30s_uniqueElements",
+    "body": [
+      "const uniqueElements = arr => [...new Set(arr)];"
+    ],
+    "description": "Returns all unique values of an array."
+  },
+  "uniqueElementsBy": {
+    "prefix": "30s_uniqueElementsBy",
+    "body": [
+      "const uniqueElementsBy = (arr, fn) =>",
+      "  arr.reduce((acc, v) => {",
+      "    if (!acc.some(x => fn(v, x))) acc.push(v);",
+      "    return acc;",
+      "  }, []);"
+    ],
+    "description": "Returns all unique values of an array, based on a provided comparator function."
+  },
+  "uniqueElementsByRight": {
+    "prefix": "30s_uniqueElementsByRight",
+    "body": [
+      "const uniqueElementsByRight = (arr, fn) =>",
+      "  arr.reduceRight((acc, v) => {",
+      "    if (!acc.some(x => fn(v, x))) acc.push(v);",
+      "    return acc;",
+      "  }, []);"
+    ],
+    "description": "Returns all unique values of an array, based on a provided comparator function."
+  },
+  "uniqueSymmetricDifference": {
+    "prefix": "30s_uniqueSymmetricDifference",
+    "body": [
+      "const uniqueSymmetricDifference = (a, b) => [",
+      "  ...new Set([...a.filter(v => !b.includes(v)), ...b.filter(v => !a.includes(v))])",
+      "];"
+    ],
+    "description": "Returns the unique symmetric difference between two arrays, not containing duplicate values from either array."
+  },
+  "untildify": {
+    "prefix": "30s_untildify",
+    "body": [
+      "const untildify = str => str.replace(/^~($|\\/|\\\\)/, `${require('os').homedir()}$1`);"
+    ],
+    "description": "Converts a tilde path to an absolute path."
+  },
+  "unzip": {
+    "prefix": "30s_unzip",
+    "body": [
+      "const unzip = arr =>",
+      "  arr.reduce(",
+      "    (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),",
+      "    Array.from({",
+      "      length: Math.max(...arr.map(x => x.length))",
+      "    }).map(x => [])",
+      "  );"
+    ],
+    "description": "Creates an array of arrays, ungrouping the elements in an array produced by [zip](#zip)."
+  },
+  "unzipWith": {
+    "prefix": "30s_unzipWith",
+    "body": [
+      "const unzipWith = (arr, fn) =>",
+      "  arr",
+      "    .reduce(",
+      "      (acc, val) => (val.forEach((v, i) => acc[i].push(v)), acc),",
+      "      Array.from({",
+      "        length: Math.max(...arr.map(x => x.length))",
+      "      }).map(x => [])",
+      "    )",
+      "    .map(val => fn(...val));"
+    ],
+    "description": "Creates an array of elements, ungrouping the elements in an array produced by [zip](#zip) and applying the provided function."
+  },
+  "URLJoin": {
+    "prefix": "30s_URLJoin",
+    "body": [
+      "const URLJoin = (...args) =>",
+      "  args",
+      "    .join('/')",
+      "    .replace(/[\\/]+/g, '/')",
+      "    .replace(/^(.+):\\//, '$1://')",
+      "    .replace(/^file:/, 'file:/')",
+      "    .replace(/\\/(\\?|&|#[^!])/g, '$1')",
+      "    .replace(/\\?/g, '&')",
+      "    .replace('&', '?');"
+    ],
+    "description": "Joins all given URL segments together, then normalizes the resulting URL."
+  },
+  "UUIDGeneratorBrowser": {
+    "prefix": "30s_UUIDGeneratorBrowser",
+    "body": [
+      "const UUIDGeneratorBrowser = () =>",
+      "  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>",
+      "    (c ^ (crypto.getRandomValues(new Uint8Array(1))[0] & (15 >> (c / 4)))).toString(16)",
+      "  );"
+    ],
+    "description": "Generates a UUID in a browser."
+  },
+  "UUIDGeneratorNode": {
+    "prefix": "30s_UUIDGeneratorNode",
+    "body": [
+      "const crypto = require('crypto');",
+      "const UUIDGeneratorNode = () =>",
+      "  ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>",
+      "    (c ^ (crypto.randomBytes(1)[0] & (15 >> (c / 4)))).toString(16)",
+      "  );"
+    ],
+    "description": "Generates a UUID in Node.JS."
+  },
+  "validateNumber": {
+    "prefix": "30s_validateNumber",
+    "body": [
+      "const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n) && Number(n) == n;"
+    ],
+    "description": "Returns `true` if the given value is a number, `false` otherwise."
+  },
+  "when": {
+    "prefix": "30s_when",
+    "body": [
+      "const when = (pred, whenTrue) => x => (pred(x) ? whenTrue(x) : x);"
+    ],
+    "description": "Tests a value, `x`, against a predicate function. If `true`, return `fn(x)`. Else, return `x`. "
+  },
+  "without": {
+    "prefix": "30s_without",
+    "body": [
+      "const without = (arr, ...args) => arr.filter(v => !args.includes(v));"
+    ],
+    "description": "Filters out the elements of an array, that have one of the specified values."
+  },
+  "words": {
+    "prefix": "30s_words",
+    "body": [
+      "const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);"
+    ],
+    "description": "Converts a given string into an array of words."
+  },
+  "xProd": {
+    "prefix": "30s_xProd",
+    "body": [
+      "const xProd = (a, b) => a.reduce((acc, x) => acc.concat(b.map(y => [x, y])), []);"
+    ],
+    "description": "Creates a new array out of the two supplied by creating each possible pair from the arrays."
+  },
+  "yesNo": {
+    "prefix": "30s_yesNo",
+    "body": [
+      "const yesNo = (val, def = false) =>",
+      "  /^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;"
+    ],
+    "description": "Returns `true` if the string is `y`/`yes` or `false` if the string is `n`/`no`."
+  },
+  "zip": {
+    "prefix": "30s_zip",
+    "body": [
+      "const zip = (...arrays) => {",
+      "  const maxLength = Math.max(...arrays.map(x => x.length));",
+      "  return Array.from({ length: maxLength }).map((_, i) => {",
+      "    return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]);",
+      "  });",
+      "};"
+    ],
+    "description": "Creates an array of elements, grouped based on the position in the original arrays."
+  },
+  "zipObject": {
+    "prefix": "30s_zipObject",
+    "body": [
+      "const zipObject = (props, values) =>",
+      "  props.reduce((obj, prop, index) => ((obj[prop] = values[index]), obj), {});"
+    ],
+    "description": "Given an array of valid property identifiers and an array of values, return an object associating the properties to the values."
+  },
+  "zipWith": {
+    "prefix": "30s_zipWith",
+    "body": [
+      "const zipWith = (...array) => {",
+      "  const fn = typeof array[array.length - 1] === 'function' ? array.pop() : undefined;",
+      "  return Array.from(",
+      "    { length: Math.max(...array.map(a => a.length)) },",
+      "    (_, i) => (fn ? fn(...array.map(a => a[i])) : array.map(a => a[i]))",
+      "  );",
+      "};"
+    ],
+    "description": "Creates an array of elements, grouped based on the position in the original arrays and using function as the last value to specify how grouped values should be combined."
+  }
+}
\ No newline at end of file