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Run results for:
JavaScript spread operator vs Object.assign performance vs merge mutation
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<iframe src="https://measurethat.net/Embed?id=514252" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 17
Operating system:
iOS 17.4
Device Platform:
Mobile
Date tested:
2 years ago
MergeObjects function
17.6M/s
Using the spread operator
5.7M/s
Using Object.assign
4.9M/s
View exact numbers
Test name
Executions per second
✓
MergeObjects function
17,589,664 Ops/sec
Using the spread operator
5,707,531 Ops/sec
Using Object.assign
4,943,024 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);
MergeObjects function
function mergeObjects(target, source) { for (const key in source) { if (typeof source[key] === 'object' && source[key] !== null) { if (!target[key] || typeof target[key] !== 'object' || target[key] === null) { target[key] = {}; } mergeObjects(target[key], source[key]); } else { target[key] = source[key]; } } } const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } mergeObjects(firstObject, secondObject)