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Run results for:
JavaScript spread operator vs Object.assign performance ( nested objects ) into empty object
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<iframe src="https://measurethat.net/Embed?id=488373" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Browser:
Chrome 119
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Using the spread operator
27.0M/s
Using Object.assign into empty object
9.0M/s
View exact numbers
Test name
Executions per second
✓
Using the spread operator
26,995,036 Ops/sec
Using Object.assign into empty object
8,964,579 Ops/sec
Tests:
Using the spread operator
const firstObject = { sampleData: 'Hello world', nested: { nestedData: "Worlds" } } const secondObject = { moreData: 'foo bar', oneNest: { secondNest: { nestedData: "Hellos" }} } const finalObject = { ...firstObject, ...secondObject };
Using Object.assign into empty object
const firstObject = { sampleData: 'Hello world', nested: { nestedData: "Worlds" } } const secondObject = { moreData: 'foo bar', oneNest: { secondNest: { nestedData: "Hellos" }} } const finalObject = Object.assign({}, firstObject, secondObject);