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Run results for:
JavaScript spread operator vs Object.assign performance vs manual copy
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<iframe src="https://measurethat.net/Embed?id=583736" 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/132.0.0.0 Safari/537.36
Browser:
Chrome 132
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Manual copy
230.5M/s
Using Object.assign
48.9M/s
Using the spread operator
41.9M/s
View exact numbers
Test name
Executions per second
✓
Manual copy
230,532,976 Ops/sec
Using Object.assign
48,882,680 Ops/sec
Using the spread operator
41,903,220 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } Object.assign(firstObject, secondObject);
Manual copy
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } firstObject.moreData = secondObject.moreData;