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Run results for:
Object.defineProperty vs Object.assign
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<iframe src="https://measurethat.net/Embed?id=591532" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.2 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Object.defineProperty
129K/s
Object.assign (mutable)
106K/s
Object.assign (immutable)
10K/s
View exact numbers
Test name
Executions per second
✓
Object.defineProperty
128,615 Ops/sec
Object.assign (mutable)
106,032 Ops/sec
Object.assign (immutable)
10,052 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 }), {});