Run results for: Immerjs vs Immutable vs Shallow copy vs Object.assign (performance test)

Run details:

User agent: Mozilla/5.0 (Android 15; Mobile; rv:135.0) Gecko/135.0 Firefox/135.0

Browser: Firefox Mobile 135

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Shallow copy

33/s

Object.assign

29/s

immer

13/s

Immutable

2/s

View exact numbers

Test name	Executions per second
✓ Shallow copy	33 Ops/sec
Object.assign	29 Ops/sec
immer	13 Ops/sec
Immutable	2 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/immer/dist/immer.umd.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.2/immutable.js"></script>

Script Preparation code:

//const { fromJS } = require('immutable');
var data = { items: {}, count: 0, keys: [] }

for (let index = 0; index < 100000; index++) {
  data[index] = { id: index, name: `ITEM-${index}`, value: Math.random() }
  data.count++
  data.keys.push(index)
}

var NEW_ITEM_ID = data.count +1

var produce = immer.default

var im = Immutable.fromJS(data);

Tests:

immer
data = produce(data, draft => { draft.items[NEW_ITEM_ID] = { id: NEW_ITEM_ID, name: 'ITEM-NEW', value: 0 } draft.counter++ draft.keys.push(NEW_ITEM_ID) })
Immutable
var im = Immutable.fromJS(data); im = im.set('items', im.get('items').set(NEW_ITEM_ID, { id: NEW_ITEM_ID, name: 'ITEM-NEW', value: 0 })); im = im.set('count', im.count +1); im = im.set('keys', im.get('keys').push(NEW_ITEM_ID));
Shallow copy
data = { ...data, items: { ...data.items, [NEW_ITEM_ID]: { id: NEW_ITEM_ID, name: 'ITEM-NEW', value: 0 }, }, count: data.count + 1, keys: [...data.keys, NEW_ITEM_ID] }
Object.assign
data = Object.assign(data, { ...data, items: Object.assign(data.items, { [NEW_ITEM_ID]: { id: NEW_ITEM_ID, name: 'ITEM-NEW', value: 0 }, }), count: data.count + 1, keys: [...data.keys, NEW_ITEM_ID] })