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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=583627" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.1.1
Device Platform:
Mobile
Date tested:
one year ago
with mutation
3.8M/s
with object assign
412K/s
with spread operator
292K/s
View exact numbers
Test name
Executions per second
✓
with mutation
3,816,768 Ops/sec
with object assign
411,593 Ops/sec
with spread operator
292,378 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}) }, {})