Run results for: Object creation

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36

Browser: Chrome 72

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Object spread	23620808.0 Ops/sec
Object.assign	1857435.6 Ops/sec
_.extend	674305.0 Ops/sec
immutable record	48028.1 Ops/sec
Babelified spread	323295.9 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/immutable/4.0.0-rc.12/immutable.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

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; }

function _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; }

Tests:

Object spread
const obj1 = {mamka: 'big', jopa: 'fat'} const obj2 = {...obj1}
Object.assign
const obj1 = {mamka: 'big', jopa: 'fat'} const obj2 = Object.assign({}, obj1)
_.extend
const obj1 = {mamka: 'big', jopa: 'fat'} const obj2 = _.extend({}, obj1)
immutable record
const rec1 = Immutable.Record({mamka: 'big', jopa: 'fat'}); const rec2 = rec1({mamka: 'small', jopa: 'thin'})
Babelified spread
var obj1 = { mamka: 'big', jopa: 'fat' }; var obj2 = _objectSpread({}, obj1);

Run results for: Object creation

Object spread

Object.assign

_.extend

immutable record

Babelified spread