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Run results for:
spread vs mutation vs Object.assign for reduce callback
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<iframe src="https://measurethat.net/Embed?id=607100" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/136.0.7103.91 Mobile/15E148 Safari/604.1
Browser:
Chrome Mobile iOS 136
Operating system:
iOS 18.5.0
Device Platform:
Mobile
Date tested:
one year ago
with mutation
3.1M/s
with object assign
305K/s
with spread operator
229K/s
View exact numbers
Test name
Executions per second
✓
with mutation
3,071,735 Ops/sec
with object assign
305,275 Ops/sec
with spread operator
229,066 Ops/sec
Tests:
with spread operator
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } range(0, 10).reduce((acc, num) => { return { ...acc, [num]: num } }, {})
with mutation
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } range(0, 10).reduce((acc, num) => { acc[num] = num return acc }, {})
with object assign
const range = (from, to) => { const output = [] for(var x = from; x < to; x++){ output.push(x) } return output } range(0, 10).reduce((acc, num) => { return Object.assign(acc, {[num]: num}) }, {})