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Run results for:
JavaScript spread operator vs Object.assign vs mutation performance with condition #2
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<iframe src="https://measurethat.net/Embed?id=486386" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 117
Operating system:
Android
Device Platform:
Mobile
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Using mutation
242.4M/s
Using the spread operator
6.4M/s
Using Object.assign
1.7M/s
View exact numbers
Test name
Executions per second
✓
Using mutation
242,396,544 Ops/sec
Using the spread operator
6,395,856 Ops/sec
Using Object.assign
1,746,734 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !!secondObject?.moreData const finalObject = { ...firstObject, ...(conditionState ? secondObject : {}) };
Using Object.assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !!secondObject?.moreData const finalObject = Object.assign(firstObject, conditionState && secondObject);
Using mutation
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const conditionState = !!secondObject?.moreData const finalObject = { sampleData: firstObject.sampleData } if (conditionState) { finalObject.moreData = secondObject.moreData }