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30secondsofcode
2020-03-05 21:10:09 +00:00
parent a9c58a0b95
commit 6ae9cd2fcb
13 changed files with 125 additions and 127 deletions
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49
snippet_data/snippetList.json
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@ -464,14 +464,14 @@
"type": "snippetListing", "type": "snippetListing",
"title": "coalesce", "title": "coalesce",
"attributes": { "attributes": {
"text": "Returns the first non-null/undefined argument.\n\nUse `Array.prototype.find()` to return the first non `null`/`undefined` argument.\n\n", "text": "Returns the first defined, non-null argument.\n\nUse `Array.prototype.find()` and `Array.prototype.includes()` to find the first value that is not equal to `undefined` or `null`.\n\n",
"tags": [ "tags": [
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"type": "snippetListing", "type": "snippetListing",
"title": "getType", "title": "getType",
"attributes": { "attributes": {
"text": "Returns the native type of a value.\n\nReturns lowercased constructor name of value, `\"undefined\"` or `\"null\"` if value is `undefined` or `null`.\n\n", "text": "Returns the native type of a value.\n\nReturn `\"undefined\"` or `\"null\"` if the value is `undefined` or `null`.\nOtherwise, use `Object.prototype.constructor.name` to get the name of the constructor, `String.prototype.toLowerCase()` to return it in lowercase.\n\n",
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@ -1777,14 +1777,15 @@
"type": "snippetListing", "type": "snippetListing",
"title": "hammingDistance", "title": "hammingDistance",
"attributes": { "attributes": {
"text": "Calculates the Hamming distance between two values.\n\nUse XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.\nCount and return the number of `1`s in the string, using `match(/1/g)`.\n\n", "text": "Calculates the Hamming distance between two values.\n\nUse the XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.\nCount and return the number of `1`s in the string, using `match(/1/g)`.\n\n",
"tags": [ "tags": [
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"beginner" "regexp",
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@ -2536,14 +2537,14 @@
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"title": "isNil", "title": "isNil",
"attributes": { "attributes": {
"text": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `null` or `undefined`.\n\n", "text": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value of `val` is equal to `null` or `undefined`.\n\n",
"tags": [ "tags": [
"type", "type",
"beginner" "beginner"
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"type": "snippetListing", "type": "snippetListing",
"title": "isNull", "title": "isNull",
"attributes": { "attributes": {
"text": "Returns `true` if the specified value is `null`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `null`.\n\n", "text": "Returns `true` if the specified value is `null`, `false` otherwise.\n\nUse the strict equality operator to check if the value of `val` is equal to `null`.\n\n",
"tags": [ "tags": [
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@ -2820,14 +2821,14 @@
"type": "snippetListing", "type": "snippetListing",
"title": "isUndefined", "title": "isUndefined",
"attributes": { "attributes": {
"text": "Returns `true` if the specified value is `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `undefined`.\n\n", "text": "Returns `true` if the specified value is `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if `val` is equal to `undefined`.\n\n",
"tags": [ "tags": [
"type", "type",
"beginner" "beginner"
] ]
}, },
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139
snippet_data/snippets.json
View File

@ -755,11 +755,11 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "coalesce.md", "fileName": "coalesce.md",
"text": "Returns the first non-null/undefined argument.\n\nUse `Array.prototype.find()` to return the first non `null`/`undefined` argument.\n\n", "text": "Returns the first defined, non-null argument.\n\nUse `Array.prototype.find()` and `Array.prototype.includes()` to find the first value that is not equal to `undefined` or `null`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const coalesce = (...args) => args.find(_ => ![undefined, null].includes(_));", "es6": "const coalesce = (...args) => args.find(v => ![undefined, null].includes(v));",
"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};", "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 (v) {\n return ![undefined, null].includes(v);\n });\n};",
"example": "coalesce(null, undefined, '', NaN, 'Waldo'); // \"\"" "example": "coalesce(null, undefined, '', NaN, 'Waldo'); // ''"
}, },
"tags": [ "tags": [
"utility", "utility",
@ -767,10 +767,10 @@
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@ -1679,7 +1679,7 @@
"fileName": "dig.md", "fileName": "dig.md",
"text": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\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.\n\n", "text": "Returns the target value in a nested JSON object, based on the given key.\n\nUse the `in` operator to check if `target` exists in `obj`.\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.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const dig = (obj, target) =>\n target in obj\n ? obj[target]\n : Object.values(obj).reduce((acc, val) => {\n if (acc !== undefined) return acc;\n if (typeof val === 'object') return dig(val, target);\n }, undefined);", "es6": "const dig = (obj, target) =>\n target in obj\n ? obj[target]\n : Object.values(obj).reduce((acc, val) => {\n if (acc !== undefined) return acc;\n if (typeof val === 'object') return dig(val, target);\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};", "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 = {\n level1: {\n level2: {\n level3: 'some data'\n }\n }\n};\ndig(data, 'level3'); // 'some data'\ndig(data, 'level4'); // undefined" "example": "const data = {\n level1: {\n level2: {\n level3: 'some data'\n }\n }\n};\ndig(data, 'level3'); // 'some data'\ndig(data, 'level4'); // undefined"
}, },
@ -1690,10 +1690,10 @@
] ]
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@ -2065,7 +2065,7 @@
"fileName": "factorial.md", "fileName": "factorial.md",
"text": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n\n", "text": "Calculates the factorial of a number.\n\nUse recursion.\nIf `n` is less than or equal to `1`, return `1`.\nOtherwise, return the product of `n` and the factorial of `n - 1`.\nThrows an exception if `n` is a negative number.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const factorial = n =>\n n < 0\n ? (() => {\n throw new TypeError('Negative numbers are not allowed!');\n })()\n : n <= 1\n ? 1\n : n * factorial(n - 1);", "es6": "const factorial = n =>\n n < 0\n ? (() => {\n throw new TypeError('Negative numbers are not allowed!');\n })()\n : n <= 1\n ? 1\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};", "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" "example": "factorial(6); // 720"
}, },
@ -2076,10 +2076,10 @@
] ]
}, },
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@ -2755,7 +2755,7 @@
"fileName": "getMeridiemSuffixOfInteger.md", "fileName": "getMeridiemSuffixOfInteger.md",
"text": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n\n", "text": "Converts an integer to a suffixed string, adding `am` or `pm` based on its value.\n\nUse the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const getMeridiemSuffixOfInteger = num =>\n num === 0 || num === 24\n ? 12 + 'am'\n : num === 12\n ? 12 + 'pm'\n : num < 12\n ? (num % 12) + 'am'\n : (num % 12) + 'pm';", "es6": "const getMeridiemSuffixOfInteger = num =>\n num === 0 || num === 24\n ? 12 + 'am'\n : num === 12\n ? 12 + 'pm'\n : num < 12\n ? (num % 12) + 'am'\n : (num % 12) + 'pm';",
"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};", "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\"\ngetMeridiemSuffixOfInteger(11); // \"11am\"\ngetMeridiemSuffixOfInteger(13); // \"1pm\"\ngetMeridiemSuffixOfInteger(25); // \"1pm\"" "example": "getMeridiemSuffixOfInteger(0); // \"12am\"\ngetMeridiemSuffixOfInteger(11); // \"11am\"\ngetMeridiemSuffixOfInteger(13); // \"1pm\"\ngetMeridiemSuffixOfInteger(25); // \"1pm\""
}, },
@ -2765,10 +2765,10 @@
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@ -2829,7 +2829,7 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "getType.md", "fileName": "getType.md",
"text": "Returns the native type of a value.\n\nReturns lowercased constructor name of value, `\"undefined\"` or `\"null\"` if value is `undefined` or `null`.\n\n", "text": "Returns the native type of a value.\n\nReturn `\"undefined\"` or `\"null\"` if the value is `undefined` or `null`.\nOtherwise, use `Object.prototype.constructor.name` to get the name of the constructor, `String.prototype.toLowerCase()` to return it in lowercase.\n\n",
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"es6": "const getType = v =>\n v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();", "es6": "const getType = v =>\n v === undefined ? 'undefined' : v === null ? 'null' : v.constructor.name.toLowerCase();",
"es5": "var 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};",
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@ -2908,7 +2908,7 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "hammingDistance.md", "fileName": "hammingDistance.md",
"text": "Calculates the Hamming distance between two values.\n\nUse XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.\nCount and return the number of `1`s in the string, using `match(/1/g)`.\n\n", "text": "Calculates the Hamming distance between two values.\n\nUse the XOR operator (`^`) to find the bit difference between the two numbers, convert to a binary string using `toString(2)`.\nCount and return the number of `1`s in the string, using `match(/1/g)`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const hammingDistance = (num1, num2) => ((num1 ^ num2).toString(2).match(/1/g) || '').length;", "es6": "const hammingDistance = (num1, num2) => ((num1 ^ num2).toString(2).match(/1/g) || '').length;",
"es5": "var 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};",
@ -2916,14 +2916,15 @@
}, },
"tags": [ "tags": [
"math", "math",
"beginner" "regexp",
"intermediate"
] ]
}, },
"meta": { "meta": {
"hash": "b4234c37a89fb91b38283fc4ce8c4ccb2d7fb62d522f0becad4dd3d6a62efe56", "hash": "bab775633603d798a5475f4bd22afdcbdea8bfdf81ea58eba661c16ee2a1ffbf",
"firstSeen": "1513526151", "firstSeen": "1513526151",
"lastUpdated": "1565681352", "lastUpdated": "1583442408",
"updateCount": 7, "updateCount": 8,
"authorCount": 5 "authorCount": 5
} }
}, },
@ -4147,7 +4148,7 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "isNil.md", "fileName": "isNil.md",
"text": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `null` or `undefined`.\n\n", "text": "Returns `true` if the specified value is `null` or `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value of `val` is equal to `null` or `undefined`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const isNil = val => val === undefined || val === null;", "es6": "const isNil = val => val === undefined || val === null;",
"es5": "var isNil = function isNil(val) {\n return val === undefined || val === null;\n};", "es5": "var isNil = function isNil(val) {\n return val === undefined || val === null;\n};",
@ -4159,10 +4160,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "fd508fc1174e19116709b5979af67b3bcc48100b19e5a87e15b9545ba0a56d88", "hash": "c09e927ebf399af3fa3bd3873b407f26130f86e6abb7871f88e1892baed899bf",
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"lastUpdated": "1565681352", "lastUpdated": "1583442386",
"updateCount": 3, "updateCount": 4,
"authorCount": 2 "authorCount": 2
} }
}, },
@ -4172,7 +4173,7 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "isNull.md", "fileName": "isNull.md",
"text": "Returns `true` if the specified value is `null`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `null`.\n\n", "text": "Returns `true` if the specified value is `null`, `false` otherwise.\n\nUse the strict equality operator to check if the value of `val` is equal to `null`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const isNull = val => val === null;", "es6": "const isNull = val => val === null;",
"es5": "var isNull = function isNull(val) {\n return val === null;\n};", "es5": "var isNull = function isNull(val) {\n return val === null;\n};",
@ -4184,10 +4185,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "ecce7adac512977eb9a1f6ea9644c1e1318ca8611512009fbd55ea38519aa1c3", "hash": "4247f69d4cb570cccbe23e147336e5a610070be0fce5d3c5011f7b04a6f9ed3e",
"firstSeen": "1514715979", "firstSeen": "1514715979",
"lastUpdated": "1565681352", "lastUpdated": "1583442386",
"updateCount": 5, "updateCount": 6,
"authorCount": 3 "authorCount": 3
} }
}, },
@ -4611,7 +4612,7 @@
"type": "snippet", "type": "snippet",
"attributes": { "attributes": {
"fileName": "isUndefined.md", "fileName": "isUndefined.md",
"text": "Returns `true` if the specified value is `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if the value and of `val` are equal to `undefined`.\n\n", "text": "Returns `true` if the specified value is `undefined`, `false` otherwise.\n\nUse the strict equality operator to check if `val` is equal to `undefined`.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const isUndefined = val => val === undefined;", "es6": "const isUndefined = val => val === undefined;",
"es5": "var isUndefined = function isUndefined(val) {\n return val === undefined;\n};", "es5": "var isUndefined = function isUndefined(val) {\n return val === undefined;\n};",
@ -4623,10 +4624,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "6ebaa03264b6b2f637f8380b8796ebdc820a2031db72fcfd5d6d657af79b496c", "hash": "c76d495087390da80a6a0d54f27220254b0cd547a79ac1357a4b04e43938794a",
"firstSeen": "1516114221", "firstSeen": "1516114221",
"lastUpdated": "1565681352", "lastUpdated": "1583442386",
"updateCount": 3, "updateCount": 4,
"authorCount": 2 "authorCount": 2
} }
}, },
@ -4766,7 +4767,7 @@
"fileName": "join.md", "fileName": "join.md",
"text": "Joins all elements of an array into a string and returns this string.\nUses a separator and an end separator.\n\nUse `Array.prototype.reduce()` to combine elements into a string.\nOmit the second argument, `separator`, to use a default separator of `','`.\nOmit the third argument, `end`, to use the same value as `separator` by default.\n\n", "text": "Joins all elements of an array into a string and returns this string.\nUses a separator and an end separator.\n\nUse `Array.prototype.reduce()` to combine elements into a string.\nOmit the second argument, `separator`, to use a default separator of `','`.\nOmit the third argument, `end`, to use the same value as `separator` by default.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const join = (arr, separator = ',', end = separator) =>\n arr.reduce(\n (acc, val, i) =>\n i === arr.length - 2\n ? acc + val + end\n : i === arr.length - 1\n ? acc + val\n : acc + val + separator,\n ''\n );", "es6": "const join = (arr, separator = ',', end = separator) =>\n arr.reduce(\n (acc, val, i) =>\n i === arr.length - 2\n ? acc + val + end\n : i === arr.length - 1\n ? acc + val\n : 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};", "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\"\njoin(['pen', 'pineapple', 'apple', 'pen'], ','); // \"pen,pineapple,apple,pen\"\njoin(['pen', 'pineapple', 'apple', 'pen']); // \"pen,pineapple,apple,pen\"" "example": "join(['pen', 'pineapple', 'apple', 'pen'], ',', '&'); // \"pen,pineapple,apple&pen\"\njoin(['pen', 'pineapple', 'apple', 'pen'], ','); // \"pen,pineapple,apple,pen\"\njoin(['pen', 'pineapple', 'apple', 'pen']); // \"pen,pineapple,apple,pen\""
}, },
@ -4776,10 +4777,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "3db3faac666ee61ab86c70766d2ab5d1293ffd818da87edb971bfff7a366364a", "hash": "362fddaa6244404741e84bca6fc442a101fdb642af53b299e8b9994d0d7162d8",
"firstSeen": "1514801920", "firstSeen": "1514801920",
"lastUpdated": "1582054301", "lastUpdated": "1582057110",
"updateCount": 72, "updateCount": 73,
"authorCount": 7 "authorCount": 7
} }
}, },
@ -5699,7 +5700,7 @@
"fileName": "objectToQueryString.md", "fileName": "objectToQueryString.md",
"text": "Returns a query string generated from the key-value pairs of the given object.\n\nUse `Array.prototype.reduce()` on `Object.entries(queryParameters)` to create the query string.\nDetermine the `symbol` to be either `?` or `&` based on the `length` of `queryString` and concatenate `val` to `queryString` only if it's a string.\nReturn the `queryString` or an empty string when the `queryParameters` are falsy.\n\n", "text": "Returns a query string generated from the key-value pairs of the given object.\n\nUse `Array.prototype.reduce()` on `Object.entries(queryParameters)` to create the query string.\nDetermine the `symbol` to be either `?` or `&` based on the `length` of `queryString` and concatenate `val` to `queryString` only if it's a string.\nReturn the `queryString` or an empty string when the `queryParameters` are falsy.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const objectToQueryString = queryParameters => {\n return queryParameters\n ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {\n const symbol = queryString.length === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';\n return queryString;\n }, '')\n : '';\n};", "es6": "const objectToQueryString = queryParameters => {\n return queryParameters\n ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {\n const symbol = queryString.length === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';\n return queryString;\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) { if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === \"[object Arguments]\")) { return; } 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 objectToQueryString = function objectToQueryString(queryParameters) {\n return queryParameters ? Object.entries(queryParameters).reduce(function (queryString, _ref, index) {\n var _ref2 = _slicedToArray(_ref, 2),\n key = _ref2[0],\n val = _ref2[1];\n\n var symbol = queryString.length === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? \"\".concat(symbol).concat(key, \"=\").concat(val) : '';\n return queryString;\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) { if (!(Symbol.iterator in Object(arr) || Object.prototype.toString.call(arr) === \"[object Arguments]\")) { return; } 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 objectToQueryString = function objectToQueryString(queryParameters) {\n return queryParameters ? Object.entries(queryParameters).reduce(function (queryString, _ref, index) {\n var _ref2 = _slicedToArray(_ref, 2),\n key = _ref2[0],\n val = _ref2[1];\n\n var symbol = queryString.length === 0 ? '?' : '&';\n queryString += typeof val === 'string' ? \"\".concat(symbol).concat(key, \"=\").concat(val) : '';\n return queryString;\n }, '') : '';\n};",
"example": "objectToQueryString({ page: '1', size: '2kg', key: undefined }); // '?page=1&size=2kg'" "example": "objectToQueryString({ page: '1', size: '2kg', key: undefined }); // '?page=1&size=2kg'"
}, },
@ -5711,10 +5712,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "e8f820ce6da97eabde082ffb829c9fb700e85efc79bdebe883c67237269e3f52", "hash": "b031c3387ef66411ab5d295788eac4247ada5b4b068dda90603d3c973890bc26",
"firstSeen": "1570824965", "firstSeen": "1570824965",
"lastUpdated": "1582054301", "lastUpdated": "1582057110",
"updateCount": 39, "updateCount": 40,
"authorCount": 4 "authorCount": 4
} }
}, },
@ -6268,7 +6269,7 @@
"codeBlocks": { "codeBlocks": {
"es6": "const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));", "es6": "const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Promise.resolve(arg));",
"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};", "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(\n x => x + 1,\n x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\n x => x + 3,\n async x => (await x) + 4\n);\n(async () => {\n console.log(await sum(5)); // 15 (after one second)\n})();" "example": "const sum = pipeAsyncFunctions(\n x => x + 1,\n x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),\n x => x + 3,\n async x => (await x) + 4\n);\n(async() => {\n console.log(await sum(5)); // 15 (after one second)\n})();"
}, },
"tags": [ "tags": [
"function", "function",
@ -6277,10 +6278,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "a2b9ac4f1209c3791caa6f40f0d041acd75514e9ee8909f2e3833635f357c0bd", "hash": "0eb844801e767edcaa6a882a6dce4b5b1dadecb53a92d6ec259d36c57b6a3dd0",
"firstSeen": "1517069864", "firstSeen": "1517069864",
"lastUpdated": "1582054301", "lastUpdated": "1582057110",
"updateCount": 97, "updateCount": 98,
"authorCount": 5 "authorCount": 5
} }
}, },
@ -6911,7 +6912,7 @@
"fileName": "remove.md", "fileName": "remove.md",
"text": "Removes elements from an array for which the given function returns `false`.\n\nUse `Array.prototype.filter()` to find array elements that return truthy values and `Array.prototype.reduce()` to remove elements using `Array.prototype.splice()`.\nThe `func` is invoked with three arguments (`value, index, array`).\n\n", "text": "Removes elements from an array for which the given function returns `false`.\n\nUse `Array.prototype.filter()` to find array elements that return truthy values and `Array.prototype.reduce()` to remove elements using `Array.prototype.splice()`.\nThe `func` is invoked with three arguments (`value, index, array`).\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const remove = (arr, func) =>\n Array.isArray(arr)\n ? arr.filter(func).reduce((acc, val) => {\n arr.splice(arr.indexOf(val), 1);\n return acc.concat(val);\n }, [])\n : [];", "es6": "const remove = (arr, func) =>\n Array.isArray(arr)\n ? arr.filter(func).reduce((acc, val) => {\n arr.splice(arr.indexOf(val), 1);\n return acc.concat(val);\n }, [])\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};", "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]" "example": "remove([1, 2, 3, 4], n => n % 2 === 0); // [2, 4]"
}, },
@ -6921,10 +6922,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "c1542907e6295eb81df918174c247a65d73c8daccc56769f2eb32d609b7846fc", "hash": "069472d018c3102412dafc2ae8ec6e9396e53c01d0073079f2e3f1ac3c99b6e9",
"firstSeen": "1513521691", "firstSeen": "1513521691",
"lastUpdated": "1582054301", "lastUpdated": "1582057110",
"updateCount": 93, "updateCount": 94,
"authorCount": 6 "authorCount": 6
} }
}, },
@ -7425,7 +7426,7 @@
"fileName": "size.md", "fileName": "size.md",
"text": "Gets the size of an array, object or string.\n\nGet type of `val` (`array`, `object` or `string`). \nUse `length` property for arrays.\nUse `length` or `size` value if available or number of keys for objects.\nUse `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API/Blob) created from `val` for strings.\nSplit strings into array of characters with `split('')` and return its length.\n\n", "text": "Gets the size of an array, object or string.\n\nGet type of `val` (`array`, `object` or `string`). \nUse `length` property for arrays.\nUse `length` or `size` value if available or number of keys for objects.\nUse `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API/Blob) created from `val` for strings.\nSplit strings into array of characters with `split('')` and return its length.\n\n",
"codeBlocks": { "codeBlocks": {
"es6": "const size = val =>\n Array.isArray(val)\n ? val.length\n : val && typeof val === 'object'\n ? val.size || val.length || Object.keys(val).length\n : typeof val === 'string'\n ? new Blob([val]).size\n : 0;", "es6": "const size = val =>\n Array.isArray(val)\n ? val.length\n : val && typeof val === 'object'\n ? val.size || val.length || Object.keys(val).length\n : typeof val === 'string'\n ? new Blob([val]).size\n : 0;",
"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};", "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\nsize('size'); // 4\nsize({ one: 1, two: 2, three: 3 }); // 3" "example": "size([1, 2, 3, 4, 5]); // 5\nsize('size'); // 4\nsize({ one: 1, two: 2, three: 3 }); // 3"
}, },
@ -7437,10 +7438,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "6dd4c6a51d2c80fa4768c95ae01c16a8359c4140bcad28c7fde0cecd72d7d3e2", "hash": "24b93b68a59b49f245590930fed6fb82e286ce09f90e292466cde63c1784c347",
"firstSeen": "1514645161", "firstSeen": "1514645161",
"lastUpdated": "1582054301", "lastUpdated": "1582057110",
"updateCount": 38, "updateCount": 39,
"authorCount": 5 "authorCount": 5
} }
}, },
@ -8363,10 +8364,10 @@
] ]
}, },
"meta": { "meta": {
"hash": "ebe1997777f4fb4c97cd5ae23a0cc590a0aab8f6762ae1d39c17f27bf2efe1c6", "hash": "b893c5ab5d118c46dc7b673413adbeddd967093c36225eb31cf446c95de0ff39",
"firstSeen": "1515424366", "firstSeen": "1515424366",
"lastUpdated": "1565681352", "lastUpdated": "1583442408",
"updateCount": 3, "updateCount": 4,
"authorCount": 2 "authorCount": 2
} }
}, },

1
snippets/deepClone.md
View File

@ -11,7 +11,6 @@ Use `Object.assign()` and an empty object (`{}`) to create a shallow clone of th
Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned. Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.
```js ```js
const deepClone = obj => { const deepClone = obj => {
if (obj === null) return null; if (obj === null) return null;
let clone = Object.assign({}, obj); let clone = Object.assign({}, obj);

1
snippets/deepMapKeys.md
View File

@ -10,7 +10,6 @@ Use `Object.keys(obj)` to iterate over the object's keys.
Use `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`. Use `Array.prototype.reduce()` to create a new object with the same values and mapped keys using `fn`.
```js ```js
const deepMapKeys = (obj, f) => const deepMapKeys = (obj, f) =>
Array.isArray(obj) Array.isArray(obj)
? obj.map(val => deepMapKeys(val, f)) ? obj.map(val => deepMapKeys(val, f))

7
snippets/dig.md
View File

@ -9,14 +9,13 @@ Use the `in` operator to check if `target` exists in `obj`.
If 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. If 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.
```js ```js
const dig = (obj, target) => const dig = (obj, target) =>
target in obj target in obj
? obj[target] ? obj[target]
: Object.values(obj).reduce((acc, val) => { : Object.values(obj).reduce((acc, val) => {
if (acc !== undefined) return acc; if (acc !== undefined) return acc;
if (typeof val === 'object') return dig(val, target); if (typeof val === 'object') return dig(val, target);
}, undefined); }, undefined);
``` ```
```js ```js

9
snippets/factorial.md
View File

@ -11,15 +11,14 @@ Otherwise, return the product of `n` and the factorial of `n - 1`.
Throws an exception if `n` is a negative number. Throws an exception if `n` is a negative number.
```js ```js
const factorial = n => const factorial = n =>
n < 0 n < 0
? (() => { ? (() => {
throw new TypeError('Negative numbers are not allowed!'); throw new TypeError('Negative numbers are not allowed!');
})() })()
: n <= 1 : n <= 1
? 1 ? 1
: n * factorial(n - 1); : n * factorial(n - 1);
``` ```
```js ```js

9
snippets/getMeridiemSuffixOfInteger.md
View File

@ -8,15 +8,14 @@ Converts an integer to a suffixed string, adding `am` or `pm` based on its value
Use the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix. Use the modulo operator (`%`) and conditional checks to transform an integer to a stringified 12-hour format with meridiem suffix.
```js ```js
const getMeridiemSuffixOfInteger = num => const getMeridiemSuffixOfInteger = num =>
num === 0 || num === 24 num === 0 || num === 24
? 12 + 'am' ? 12 + 'am'
: num === 12 : num === 12
? 12 + 'pm' ? 12 + 'pm'
: num < 12 : num < 12
? (num % 12) + 'am' ? (num % 12) + 'am'
: (num % 12) + 'pm'; : (num % 12) + 'pm';
``` ```
```js ```js

5
snippets/join.md
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@ -11,14 +11,15 @@ Omit the second argument, `separator`, to use a default separator of `','`.
Omit the third argument, `end`, to use the same value as `separator` by default. Omit the third argument, `end`, to use the same value as `separator` by default.
```js ```js
const join = (arr, separator = ',', end = separator) => const join = (arr, separator = ',', end = separator) =>
arr.reduce( arr.reduce(
(acc, val, i) => (acc, val, i) =>
i === arr.length - 2 i === arr.length - 2
? acc + val + end ? acc + val + end
: i === arr.length - 1 : i === arr.length - 1
? acc + val ? acc + val
: acc + val + separator, : acc + val + separator,
'' ''
); );
``` ```

9
snippets/objectToQueryString.md
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@ -10,13 +10,14 @@ Determine the `symbol` to be either `?` or `&` based on the `length` of `querySt
Return the `queryString` or an empty string when the `queryParameters` are falsy. Return the `queryString` or an empty string when the `queryParameters` are falsy.
```js ```js
const objectToQueryString = queryParameters => { const objectToQueryString = queryParameters => {
return queryParameters return queryParameters
? Object.entries(queryParameters).reduce((queryString, [key, val], index) => { ? Object.entries(queryParameters).reduce((queryString, [key, val], index) => {
const symbol = queryString.length === 0 ? '?' : '&'; const symbol = queryString.length === 0 ? '?' : '&';
queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : ''; queryString += typeof val === 'string' ? `${symbol}${key}=${val}` : '';
return queryString; return queryString;
}, '') }, '')
: ''; : '';
}; };
``` ```

3
snippets/pipeAsyncFunctions.md
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@ -14,13 +14,14 @@ const pipeAsyncFunctions = (...fns) => arg => fns.reduce((p, f) => p.then(f), Pr
``` ```
```js ```js
const sum = pipeAsyncFunctions( const sum = pipeAsyncFunctions(
x => x + 1, x => x + 1,
x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)), x => new Promise(resolve => setTimeout(() => resolve(x + 2), 1000)),
x => x + 3, x => x + 3,
async x => (await x) + 4 async x => (await x) + 4
); );
(async () => { (async() => {
console.log(await sum(5)); // 15 (after one second) console.log(await sum(5)); // 15 (after one second)
})(); })();
``` ```

7
snippets/remove.md
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@ -9,13 +9,12 @@ Use `Array.prototype.filter()` to find array elements that return truthy values
The `func` is invoked with three arguments (`value, index, array`). The `func` is invoked with three arguments (`value, index, array`).
```js ```js
const remove = (arr, func) => const remove = (arr, func) =>
Array.isArray(arr) Array.isArray(arr)
? arr.filter(func).reduce((acc, val) => { ? arr.filter(func).reduce((acc, val) => {
arr.splice(arr.indexOf(val), 1); arr.splice(arr.indexOf(val), 1);
return acc.concat(val); return acc.concat(val);
}, []) }, [])
: []; : [];
``` ```

9
snippets/size.md
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@ -12,14 +12,15 @@ Use `size` of a [`Blob` object](https://developer.mozilla.org/en-US/docs/Web/API
Split strings into array of characters with `split('')` and return its length. Split strings into array of characters with `split('')` and return its length.
```js ```js
const size = val => const size = val =>
Array.isArray(val) Array.isArray(val)
? val.length ? val.length
: val && typeof val === 'object' : val && typeof val === 'object'
? val.size || val.length || Object.keys(val).length ? val.size || val.length || Object.keys(val).length
: typeof val === 'string' : typeof val === 'string'
? new Blob([val]).size ? new Blob([val]).size
: 0; : 0;
``` ```
```js ```js

4
snippets/toSafeInteger.md
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@ -10,9 +10,7 @@ Use `Math.round()` to convert to an integer.
```js ```js
const toSafeInteger = num => const toSafeInteger = num =>
Math.round( Math.round(Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER));
Math.max(Math.min(num, Number.MAX_SAFE_INTEGER), Number.MIN_SAFE_INTEGER)
);
``` ```
```js ```js