Travis build: 1238

README.md

@@ -267,6 +267,7 @@ average(1, 2, 3);
 <summary>View contents</summary>
 
 * [`cleanObj`](#cleanobj)
+* [`equals`](#equals-)
 * [`functions`](#functions)
 * [`invertKeyValues`](#invertkeyvalues)
 * [`lowercaseKeys`](#lowercasekeys)
@@ -3998,6 +3999,39 @@ cleanObj(testObj, ['a'], 'children'); // { a: 1, children : { a: 1}}
 <br>[⬆ Back to top](#table-of-contents)
 
 
+### equals ![advanced](/advanced.svg)
+
+Performs a deep comparison between two values to determine if they are equivalent.
+
+Check 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).
+Check if only one value is `null` or `undefined` or if their prototypes differ.
+If none of the above conditions are met, use `Object.keys()` to check if both values have the same number of keys, then use `Array.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.
+
+```js
+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]));
+};
+```
+
+<details>
+<summary>Examples</summary>
+
+```js
+equals({ a: [2, { e: 3 }], b: [4], c: 'foo' }, { a: [2, { e: 3 }], b: [4], c: 'foo' }); // true
+```
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+
 ### functions
 
 Returns an array of function property names from own (and optionally inherited) enumerable properties of an object.

snippets/equals.md

@@ -9,12 +9,9 @@ If none of the above conditions are met, use `Object.keys()` to check if both va
 ```js
 const equals = (a, b) => {
   if (a === b) return true;
-  if (a instanceof Date && b instanceof Date)
+  if (a instanceof Date && b instanceof Date) return a.getTime() === b.getTime();
-    return a.getTime() === b.getTime();
+  if (!a || !b || (typeof a != 'object' && typeof b !== 'object')) return a === b;
-  if (!a || !b || (typeof a != 'object' && typeof b !== 'object'))
+  if (a === null || a === undefined || b === null || b === undefined) return false;
-    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;
@@ -23,5 +20,5 @@ const equals = (a, b) => {
 ```
 
 ```js
-equals({ a: [2, {e: 3}], b: [4], c: 'foo' }, { a: [2, {e: 3}], b: [4], c: 'foo' }); // true
+equals({ a: [2, { e: 3 }], b: [4], c: 'foo' }, { a: [2, { e: 3 }], b: [4], c: 'foo' }); // true
 ```