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Run results for:
Spread vs Object.assign vs Object.keys with forEach
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<iframe src="https://measurethat.net/Embed?id=586760" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Using the spread operator
9493565.0 Ops/sec
Using Object.assign
12372391.0 Ops/sec
Not merging
13097471.0 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);
Not merging
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = {} Object.keys(firstObject).forEach(key => {finalObject[key] = firstObject[key] }) Object.keys(secondObject).forEach(key => {finalObject[key] = secondObject[key] })