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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=626080" 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/145.0.0.0 Safari/537.36
Browser:
Chrome 145
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
4 months ago
New object
171.6M/s
Using the spread operator
71.4M/s
Using Object.assign
49.1M/s
View exact numbers
Test name
Executions per second
✓
New object
171,611,616 Ops/sec
Using the spread operator
71,430,304 Ops/sec
Using Object.assign
49,111,320 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' };