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Run results for:
Object.defineProperty vs Object.assign
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=585057" 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/132.0.0.0 Safari/537.36
Browser:
Chrome 132
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Object.assign (mutable)
56K/s
Object.defineProperty
56K/s
Object.assign (immutable)
2K/s
View exact numbers
Test name
Executions per second
✓
Object.assign (mutable)
56,317 Ops/sec
Object.defineProperty
56,181 Ops/sec
Object.assign (immutable)
1,504 Ops/sec
Script Preparation code:
var input = new Array(100).fill().map((v, i) => i)
Tests:
Object.defineProperty
const output = input.reduce((acc, value) => Object.defineProperty(acc, `key${value}`, { value }), {});
Object.assign (immutable)
const output = input.reduce((acc, value) => Object.assign({}, acc, { [`key${value}`]: value }), {});
Object.assign (mutable)
const output = input.reduce((acc, value) => Object.assign(acc, { [`key${value}`]: value }), {});