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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=616653" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0
Browser:
Firefox 142
Operating system:
Ubuntu
Device Platform:
Desktop
Date tested:
11 months ago
Manual copy
38.7M/s
Using Object.assign
3.3M/s
Using the spread operator
1.6M/s
View exact numbers
Test name
Executions per second
✓
Manual copy
38,706,304 Ops/sec
Using Object.assign
3,275,828 Ops/sec
Using the spread operator
1,552,118 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;