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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=596187" 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/134.0.0.0 Safari/537.36
Browser:
Chrome 134
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
defineProperty
5.1M/s
defineProperties
4.7M/s
Object.assign
2.1M/s
setPrototypeOf
1.5M/s
extends Function
1.4M/s
View exact numbers
Test name
Executions per second
✓
defineProperty
5,110,781 Ops/sec
defineProperties
4,698,954 Ops/sec
Object.assign
2,120,007 Ops/sec
setPrototypeOf
1,463,592 Ops/sec
extends Function
1,397,866 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 } })