Run results for: Immer vs Spread Reduce9

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; SM-G935F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.101 Mobile Safari/537.36

Browser: Chrome Mobile 83

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
immer	2849.6 Ops/sec
Mutate	300877.4 Ops/sec
Spread	40901.1 Ops/sec
immer pull up	13066.8 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/immer@3.1.3/dist/immer.umd.min.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

data = _.range(100)

Tests:

immer
const reducer = immer.produce((draft, curr) => { draft[0] = 0; }); const answer = data.reduce(reducer, {})
Mutate
const reducer = (draft, curr) => { draft[0] = 0; return draft; }; const answer = data.reduce(reducer, {})
Spread
const answer = data.reduce((acc, curr) => ({ ...acc, 0: 0, }), {});
immer pull up
const answer = immer.produce({}, draft => { data.reduce((acc, curr) => { acc[0] = 0; return acc }, draft) });

Run results for: Immer vs Spread Reduce9

immer

Mutate

Spread

immer pull up