Run results for: Object.assign vs spread vs Immutable.js operator for settting values

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:86.0) Gecko/20100101 Firefox/86.0

Browser: Firefox 86

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Object.assign	5214833.5 Ops/sec
spread operator	2888039.2 Ops/sec
jQuery extend	11093060.0 Ops/sec
Immutable merge	500121.0 Ops/sec

HTML Preparation code:

<script
  src="https://code.jquery.com/jquery-3.4.1.min.js"
  crossorigin="anonymous"></script>
<script
  src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.js"
  crossorigin="anonymous"></script>

Script Preparation code:

var params = { b:"hello", c: true, d:7 };
var immutable_params = Immutable.Record(params)()

Tests:

Object.assign
var other = Object.assign({ b:"world", c: false, d:2 }, params);
spread operator
var other = { b:"world", c: false, d:2, ...params };
jQuery extend
var other = $.extend({ b:"world", c: false, d:2 }, params);
Immutable merge
var other = immutable_params.merge({ b:"world", c: false, d:2 });

Run results for: Object.assign vs spread vs Immutable.js operator for settting values

Object.assign

spread operator

jQuery extend

Immutable merge