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Run results for:
JavaScript spread operator vs Object.assign performance
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<iframe src="https://measurethat.net/Embed?id=616344" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36 Edg/139.0.0.0
Browser:
Chrome 139
Operating system:
Windows
Device Platform:
Desktop
Date tested:
11 months ago
Using Object.assign
22.3M/s
Using the spread operator
17.0M/s
View exact numbers
Test name
Executions per second
✓
Using Object.assign
22,260,260 Ops/sec
Using the spread operator
17,028,410 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' } const finalObject = Object.assign(firstObject, secondObject);