Run results for: object spread vs immutable-js setIn vs mori hashmap vs immer

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.6 Safari/605.1.15

Browser: Safari 16

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
object spread	8326.7 Ops/sec
immutable-js	29645.2 Ops/sec
mori	15538.1 Ops/sec
immer	21861.2 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>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mori/0.3.2/mori.min.js"></script>
<script src="https://unpkg.com/immer@6.0.3/dist/immer.umd.production.min.js"></script>

Tests:

object spread
let obj = {sub: {}}; for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = {...obj, sub: { ...obj.sub, [key]: {key, value} }} }
immutable-js
let obj = Immutable.fromJS({a: {}}); for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i obj = obj.setIn(['a', key], {key, value}) }
mori
let hm = mori.hashMap(); hm = mori.assoc.f3(hm, "a", mori.hashMap()); for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i hm = mori.assoc.f3( hm, "a", mori.assoc.f3(mori.get(hm, "a", mori.hashMap()), key, {key, value}) ) }
immer
let state = {sub: {}};; for(i=0;i<100;i++){ const key = 'key'+i const value = 'value'+i state = immer.produce(state, draft => { state.sub[key] = {key, value} }) }