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Run results for:
JavaScript spread operator vs Object.assign direct mutation vs Object.assign in new Object performance
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<iframe src="https://measurethat.net/Embed?id=494808" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Linux
Device Platform:
Desktop
Date tested:
2 years ago
Using the spread operator
38.4M/s
Using Object.assign direct mutation
10.4M/s
Using Object.assign in new Object
8.8M/s
View exact numbers
Test name
Executions per second
✓
Using the spread operator
38,387,164 Ops/sec
Using Object.assign direct mutation
10,438,912 Ops/sec
Using Object.assign in new Object
8,791,547 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign in new Object
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({}, firstObject, secondObject);
Using Object.assign direct mutation
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);