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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=579995" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Browser:
Firefox 134
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Manual copy
305.1M/s
Using Object.assign
39.1M/s
Using the spread operator
17.1M/s
View exact numbers
Test name
Executions per second
✓
Manual copy
305,086,112 Ops/sec
Using Object.assign
39,062,500 Ops/sec
Using the spread operator
17,078,700 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;