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Run results for:
Object.assign vs defineProperties vs setPrototypeOf vs extends Function vs defineProperty
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<iframe src="https://measurethat.net/Embed?id=565629" 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/18.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
defineProperty
9.2M/s
defineProperties
8.6M/s
extends Function
6.6M/s
Object.assign
5.8M/s
setPrototypeOf
2.5M/s
View exact numbers
Test name
Executions per second
✓
defineProperty
9,190,647 Ops/sec
defineProperties
8,628,433 Ops/sec
extends Function
6,568,386 Ops/sec
Object.assign
5,756,590 Ops/sec
setPrototypeOf
2,514,275 Ops/sec
Tests:
Object.assign
let f = ()=>0 Object.assign(f, { _foo: null, get foo() {return this._foo}, set foo(_foo) {this._foo = _foo}, })
defineProperties
let f = ()=>0 Object.defineProperties(f, { foo: { value: null, writable: true } })
setPrototypeOf
let f = ()=>0 Object.setPrototypeOf(f, { ...Function.prototype, _foo: null, get foo() {return this._foo}, set foo(_foo) {this._foo = _foo}, })
extends Function
class F extends Function { constructor() { super('return 0') } _foo = null get foo() {return this._foo} set foo(_foo) {this._foo = _foo} }
defineProperty
let f = ()=>0 f._foo = null Object.defineProperty(f, 'foo', { get() { return this._foo }, set(_foo) { this._foo = _foo } })