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Run results for:
JavaScript spread operator vs Object.assign vs Direct Mutation Performance
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<iframe src="https://measurethat.net/Embed?id=601265" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Using mutation
179.9M/s
Using Object.assign
41.4M/s
Using the spread operator
36.3M/s
View exact numbers
Test name
Executions per second
✓
Using mutation
179,868,448 Ops/sec
Using Object.assign
41,399,196 Ops/sec
Using the spread operator
36,310,520 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);
Using mutation
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } firstObject.moreData = 'foo bar'