Update snippet, add extra tests

dist/_30s.es5.js

@@ -549,6 +549,7 @@
     return first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));
   };
   var deepClone = function deepClone(obj) {
+    if (obj === null) return null;
     var clone = Object.assign({}, obj);
     Object.keys(clone).forEach(function (key) {
       return clone[key] = _typeof(obj[key]) === 'object' ? deepClone(obj[key]) : obj[key];

dist/_30s.esm.js

@@ -190,6 +190,7 @@ const debounce = (fn, ms = 0) => {
 const decapitalize = ([first, ...rest], upperRest = false) =>
   first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));
 const deepClone = obj => {
+  if (obj === null) return null;
   let clone = Object.assign({}, obj);
   Object.keys(clone).forEach(
     key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
@@ -197,8 +198,8 @@ const deepClone = obj => {
   return Array.isArray(obj) && obj.length
     ? (clone.length = obj.length) && Array.from(clone)
     : Array.isArray(obj)
-      ? Array.from(obj)
-      : clone;
+    ? Array.from(obj)
+    : clone;
 };
 const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));
 const deepFreeze = obj =>
@@ -210,13 +211,13 @@ const deepMapKeys = (obj, f) =>
   Array.isArray(obj)
     ? obj.map(val => deepMapKeys(val, f))
     : typeof obj === 'object'
-      ? Object.keys(obj).reduce((acc, current) => {
+    ? Object.keys(obj).reduce((acc, current) => {
         const val = obj[current];
         acc[f(current)] =
           val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
         return acc;
       }, {})
-      : obj;
+    : obj;
 const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
 const defer = (fn, ...args) => setTimeout(fn, 1, ...args);
 const degreesToRads = deg => (deg * Math.PI) / 180.0;
@@ -238,9 +239,9 @@ 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);
+        if (acc !== undefined) return acc;
+        if (typeof val === 'object') return dig(val, target);
+      }, undefined);
 const digitize = n => [...`${n}`].map(i => parseInt(i));
 const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);
 const drop = (arr, n = 1) => arr.slice(n);
@@ -313,11 +314,11 @@ const extendHex = shortHex =>
 const factorial = n =>
   n < 0
     ? (() => {
-      throw new TypeError('Negative numbers are not allowed!');
-    })()
+        throw new TypeError('Negative numbers are not allowed!');
+      })()
     : n <= 1
-      ? 1
-      : n * factorial(n - 1);
+    ? 1
+    : n * factorial(n - 1);
 const fibonacci = n =>
   Array.from({ length: n }).reduce(
     (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
@@ -418,10 +419,10 @@ const getMeridiemSuffixOfInteger = num =>
   num === 0 || num === 24
     ? 12 + 'am'
     : num === 12
-      ? 12 + 'pm'
-      : num < 12
-        ? (num % 12) + 'am'
-        : (num % 12) + 'pm';
+    ? 12 + 'pm'
+    : num < 12
+    ? (num % 12) + 'am'
+    : (num % 12) + 'pm';
 const getScrollPosition = (el = window) => ({
   x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
   y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
@@ -642,8 +643,8 @@ const join = (arr, separator = ',', end = separator) =>
       i === arr.length - 2
         ? acc + val + end
         : i === arr.length - 1
-          ? acc + val
-          : acc + val + separator,
+        ? acc + val
+        : acc + val + separator,
     ''
   );
 const JSONtoCSV = (arr, columns, delimiter = ',') =>

dist/_30s.js

@@ -196,6 +196,7 @@
   const decapitalize = ([first, ...rest], upperRest = false) =>
     first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));
   const deepClone = obj => {
+    if (obj === null) return null;
     let clone = Object.assign({}, obj);
     Object.keys(clone).forEach(
       key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
@@ -203,8 +204,8 @@
     return Array.isArray(obj) && obj.length
       ? (clone.length = obj.length) && Array.from(clone)
       : Array.isArray(obj)
-        ? Array.from(obj)
-        : clone;
+      ? Array.from(obj)
+      : clone;
   };
   const deepFlatten = arr => [].concat(...arr.map(v => (Array.isArray(v) ? deepFlatten(v) : v)));
   const deepFreeze = obj =>
@@ -216,13 +217,13 @@
     Array.isArray(obj)
       ? obj.map(val => deepMapKeys(val, f))
       : typeof obj === 'object'
-        ? Object.keys(obj).reduce((acc, current) => {
+      ? Object.keys(obj).reduce((acc, current) => {
           const val = obj[current];
           acc[f(current)] =
             val !== null && typeof val === 'object' ? deepMapKeys(val, f) : (acc[f(current)] = val);
           return acc;
         }, {})
-        : obj;
+      : obj;
   const defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
   const defer = (fn, ...args) => setTimeout(fn, 1, ...args);
   const degreesToRads = deg => (deg * Math.PI) / 180.0;
@@ -244,9 +245,9 @@
     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);
+          if (acc !== undefined) return acc;
+          if (typeof val === 'object') return dig(val, target);
+        }, undefined);
   const digitize = n => [...`${n}`].map(i => parseInt(i));
   const distance = (x0, y0, x1, y1) => Math.hypot(x1 - x0, y1 - y0);
   const drop = (arr, n = 1) => arr.slice(n);
@@ -319,11 +320,11 @@
   const factorial = n =>
     n < 0
       ? (() => {
-        throw new TypeError('Negative numbers are not allowed!');
-      })()
+          throw new TypeError('Negative numbers are not allowed!');
+        })()
       : n <= 1
-        ? 1
-        : n * factorial(n - 1);
+      ? 1
+      : n * factorial(n - 1);
   const fibonacci = n =>
     Array.from({ length: n }).reduce(
       (acc, val, i) => acc.concat(i > 1 ? acc[i - 1] + acc[i - 2] : i),
@@ -424,10 +425,10 @@
     num === 0 || num === 24
       ? 12 + 'am'
       : num === 12
-        ? 12 + 'pm'
-        : num < 12
-          ? (num % 12) + 'am'
-          : (num % 12) + 'pm';
+      ? 12 + 'pm'
+      : num < 12
+      ? (num % 12) + 'am'
+      : (num % 12) + 'pm';
   const getScrollPosition = (el = window) => ({
     x: el.pageXOffset !== undefined ? el.pageXOffset : el.scrollLeft,
     y: el.pageYOffset !== undefined ? el.pageYOffset : el.scrollTop
@@ -648,8 +649,8 @@
         i === arr.length - 2
           ? acc + val + end
           : i === arr.length - 1
-            ? acc + val
-            : acc + val + separator,
+          ? acc + val
+          : acc + val + separator,
       ''
     );
   const JSONtoCSV = (arr, columns, delimiter = ',') =>

snippets/deepClone.md

@@ -6,23 +6,17 @@ tags: object,recursion,intermediate
 Creates a deep clone of an object.
 
 Use recursion.
+Check if the passed object is `null` and, if so, return `null`.
 Use `Object.assign()` and an empty object (`{}`) to create a shallow clone of the original.
 Use `Object.keys()` and `Array.prototype.forEach()` to determine which key-value pairs need to be deep cloned.
 
 ```js
 const deepClone = obj => {
-  let type = typeof obj;
-  let isAssignable = type === "function" || type === "object" && !!obj;
-  if (!isAssignable) {
-    return obj;
-  }
+  if (obj === null) return null;
   let clone = Object.assign({}, obj);
   Object.keys(clone).forEach(
     key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])
   );
-  if (obj) {
-    Object.setPrototypeOf(clone, Object.getPrototypeOf(obj));
-  }
   return Array.isArray(obj) && obj.length
     ? (clone.length = obj.length) && Array.from(clone)
     : Array.isArray(obj)

test/_30s.js

@@ -191,6 +191,7 @@ const debounce = (fn, ms = 0) => {
 const decapitalize = ([first, ...rest], upperRest = false) =>
   first.toLowerCase() + (upperRest ? rest.join('').toUpperCase() : rest.join(''));
 const deepClone = obj => {
+  if (obj === null) return null;
   let clone = Object.assign({}, obj);
   Object.keys(clone).forEach(
     key => (clone[key] = typeof obj[key] === 'object' ? deepClone(obj[key]) : obj[key])

test/deepClone.test.js

@@ -10,7 +10,8 @@ const data = {
   d: {},
   e: { a: 'a', b: 'b', c: 'c', d: ['a', 'b', 'c'] },
   f: 1,
-  g: true
+  g: true,
+  h: null
 };
 const dupe = deepClone(data);
 test('Shallow cloning works', () => {
@@ -33,3 +34,6 @@ test('Cloning primitives works', () => {
   expect(data.f).toBe(dupe.f);
   expect(data.g).toBe(dupe.g);
 });
+test('Cloning null works', () => {
+  expect(data.h).toBe(dupe.h);
+});