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Run results for:
JavaScript spread operator vs Object.assign performance vs Manual
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<iframe src="https://measurethat.net/Embed?id=505736" 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/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Manual assignment
114.1M/s
Using the spread operator
22.3M/s
Using Object.assign
6.9M/s
View exact numbers
Test name
Executions per second
✓
Manual assignment
114,134,912 Ops/sec
Using the spread operator
22,257,014 Ops/sec
Using Object.assign
6,941,348 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);
Manual assignment
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = {}; finalObject.sampleData = firstObject.sampleData; finalObject.moreData = secondObject.moreData;