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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=620359" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.1 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 26
Operating system:
iOS 18.7
Device Platform:
Mobile
Date tested:
8 months ago
New object
753.5M/s
Using the spread operator
61.2M/s
Using Object.assign
37.0M/s
View exact numbers
Test name
Executions per second
✓
New object
753,526,656 Ops/sec
Using the spread operator
61,177,864 Ops/sec
Using Object.assign
36,956,820 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' };