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Run results for:
JavaScript shallow copy spread operator vs Object.assign performance
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<iframe src="https://measurethat.net/Embed?id=524762" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:125.0) Gecko/20100101 Firefox/125.0
Browser:
Firefox 125
Operating system:
Linux
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Using Object.assign
4.3M/s
Using the spread operator
1.6M/s
View exact numbers
Test name
Executions per second
✓
Using Object.assign
4,259,590 Ops/sec
Using the spread operator
1,647,973 Ops/sec
Tests:
Using the spread operator
const objectToCopy = { sampleString1: 'Hello world', sampleNumber1: 123456789, sampleArray1: ['hello', 'world', 'how', 'are', 'you'], sampleString2: 'Hello world', sampleNumber2: 123456789, sampleArray2: ['hello', 'world', 'how', 'are', 'you'], sampleString3: 'Hello world', sampleNumber3: 123456789, sampleArray3: ['hello', 'world', 'how', 'are', 'you'], sampleString4: 'Hello world', sampleNumber4: 123456789, sampleArray4: ['hello', 'world', 'how', 'are', 'you'], sampleString5: 'Hello world', sampleNumber5: 123456789, sampleArray5: ['hello', 'world', 'how', 'are', 'you'], sampleString6: 'Hello world', sampleNumber6: 123456789, sampleArray6: ['hello', 'world', 'how', 'are', 'you'], sampleString7: 'Hello world', sampleNumber7: 123456789, sampleArray7: ['hello', 'world', 'how', 'are', 'you'], sampleString8: 'Hello world', sampleNumber8: 123456789, sampleArray8: ['hello', 'world', 'how', 'are', 'you'], sampleString9: 'Hello world', sampleNumber9: 123456789, sampleArray9: ['hello', 'world', 'how', 'are', 'you'], sampleString10: 'Hello world', sampleNumber10: 123456789, sampleArray10: ['hello', 'world', 'how', 'are', 'you'], } const finalObject = { ...objectToCopy, };
Using Object.assign
const objectToCopy = { sampleString1: 'Hello world', sampleNumber1: 123456789, sampleArray1: ['hello', 'world', 'how', 'are', 'you'], sampleString2: 'Hello world', sampleNumber2: 123456789, sampleArray2: ['hello', 'world', 'how', 'are', 'you'], sampleString3: 'Hello world', sampleNumber3: 123456789, sampleArray3: ['hello', 'world', 'how', 'are', 'you'], sampleString4: 'Hello world', sampleNumber4: 123456789, sampleArray4: ['hello', 'world', 'how', 'are', 'you'], sampleString5: 'Hello world', sampleNumber5: 123456789, sampleArray5: ['hello', 'world', 'how', 'are', 'you'], sampleString6: 'Hello world', sampleNumber6: 123456789, sampleArray6: ['hello', 'world', 'how', 'are', 'you'], sampleString7: 'Hello world', sampleNumber7: 123456789, sampleArray7: ['hello', 'world', 'how', 'are', 'you'], sampleString8: 'Hello world', sampleNumber8: 123456789, sampleArray8: ['hello', 'world', 'how', 'are', 'you'], sampleString9: 'Hello world', sampleNumber9: 123456789, sampleArray9: ['hello', 'world', 'how', 'are', 'you'], sampleString10: 'Hello world', sampleNumber10: 123456789, sampleArray10: ['hello', 'world', 'how', 'are', 'you'], } const finalObject = Object.assign({}, objectToCopy);