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Run results for:
JavaScript spread operator vs Object.assign vs new object performance
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<iframe src="https://measurethat.net/Embed?id=633011" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.5 Safari/605.1.15
Browser:
Safari 26
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
21 days ago
New object
964.5M/s
Using the spread operator
90.9M/s
Using Object.assign
51.6M/s
View exact numbers
Test name
Executions per second
✓
New object
964,507,392 Ops/sec
Using the spread operator
90,908,912 Ops/sec
Using Object.assign
51,643,220 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar', evenMoreData: 'overridethis' } const finalObject = { ...firstObject, evenMoreData: 'test' };
Using Object.assign
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar', evenMoreData: 'overridethis' } const finalObject = Object.assign(firstObject, {evenMoreData: 'test'});
New object
const firstObject = { sampleData: 'Hello world', moreData: 'foo bar', evenMoreData: 'overridethis' } const finalObject = { sampleData: firstObject.sampleData, moreData: firstObject.firstObject, evenMoreData: 'test' };