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Run results for:
object assign vs object spread on growing objects
Object.assign and the spread operator are about equally fast on tiny objects. But how do they scale as objects get increasingly more keys?
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<iframe src="https://measurethat.net/Embed?id=597634" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
assign
4K/s
spread
3K/s
View exact numbers
Test name
Executions per second
✓
assign
3,657 Ops/sec
spread
3,039 Ops/sec
Tests:
assign
const obj = {} for (let i = 0; i < 10000; i++) { Object.assign(obj, { i }) }
spread
let obj = {} for (let i = 0; i < 10000; i++) { obj = { ...obj, ...{ i } } }