Run results for: Object creation 3

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:99.0) Gecko/20100101 Firefox/99.0

Browser: Firefox 99

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Object spread	2969373.0 Ops/sec
Object.assign	3462546.0 Ops/sec
Babelified spread	778683.1 Ops/sec
nothing	151528096.0 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; }

var obj1 = {v1: 1, v2:2, v3:3, v4:4, v5:5, v6:5, v7:7, v8:8, v9:9, v10:10}

Tests:

Object spread
var obj2 = {...obj1}
Object.assign
var obj2 = Object.assign({}, obj1)
Babelified spread
var obj2 = _objectSpread({}, obj1);
nothing
obj1.v1; obj1.v2; obj1.v3; obj1.v4; obj1.v5; obj1.v6; obj1.v7; obj1.v8; obj1.v9; obj1.v10; obj1.v1; obj1.v2; obj1.v3; obj1.v4; obj1.v5; obj1.v6; obj1.v7; obj1.v8; obj1.v9; obj1.v10; obj1.v1; obj1.v2; obj1.v3; obj1.v4; obj1.v5; obj1.v6; obj1.v7; obj1.v8; obj1.v9; obj1.v10;

Run results for: Object creation 3

Object spread

Object.assign

Babelified spread

nothing