Run results for: Immer vs shallow copy222ddd

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:80.0) Gecko/20100101 Firefox/80.0

Browser: Firefox 80

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
immer	1732.5 Ops/sec
shallow copy	988479.2 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/immer@6.0.5/dist/immer.umd.production.min.js"></script>

Script Preparation code:

var data = { items: {}, count: 0, keys: [] }

for (let index = 0; index < 100; index++) {
  data.items[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

Tests:

immer
var x = 0; data = produce(data, draft => { draft.keys.forEach(i => x += draft.items[i].id); })
shallow copy
var x = 0; data.keys.forEach(i => x += data.items[i].id);