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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=565537" 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/130.0.0.0 Safari/537.36
Browser:
Chrome 130
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
assign
1373.4 Ops/sec
spread
5656.2 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 } } }