Run results for: object spread vs immutable-js set

Run details:

User agent: Mozilla/5.0 (Linux; Android 6.0.1; KODAK SMARTWAY X1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36

Browser: Chrome Mobile 76

Operating system: Android 6.0.1

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
object spread	440.5 Ops/sec
immutable-js	3897.9 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/immutability-helper@2.7.0/index.min.js"></script>

Tests:

object spread
let obj = {}; for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = {...obj, [key]: {key, value}} }
immutable-js
let obj = Immutable.Map(); for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = obj.set(key, {key, value}) }