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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=514273" 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/17.4 Safari/605.1.15
Browser:
Safari 17
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
MergeObjects function
24.9M/s
Using the spread operator
7.5M/s
Using Object.assign
7.3M/s
View exact numbers
Test name
Executions per second
✓
MergeObjects function
24,928,908 Ops/sec
Using the spread operator
7,531,426 Ops/sec
Using Object.assign
7,256,352 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)