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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=568514" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:130.0) Gecko/20100101 Firefox/130.0
Browser:
Firefox 130
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
assign
612/s
spread
288/s
View exact numbers
Test name
Executions per second
✓
assign
612 Ops/sec
spread
288 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 } } }