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Run results for:
JavaScript spread operator vs Object.assign performance vs manual copy With more complex data
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<iframe src="https://measurethat.net/Embed?id=620249" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:144.0) Gecko/20100101 Firefox/144.0
Browser:
Firefox 144
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
6 months ago
Test name
Executions per second
Using the spread operator
8027012.0 Ops/sec
Using Object.assign
17662042.0 Ops/sec
Manual copy
202954384.0 Ops/sec
Script Preparation code:
const firstObject = { sampleData: 'Hello world', key1: 'value1', key2: 'value 2', key3: 'value 3', keyNum1: 123456 }; const secondObject = { moreData: 'foo bar', key1: 'value1.1', key4: 'value4' };
Tests:
Using the spread operator
const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const finalObject = Object.assign({}, firstObject, secondObject);
Manual copy
const finalObject = { sampleData: firstObject.sampleData, key1 : firstObject.key1, key2 : firstObject.key2, key3 : firstObject.key3, keyNum1 : firstObject.keyNum1, moreData: secondObject.moreData , key1: secondObject.key1 , key4 : secondObject.key4 };