Reflect

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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2016 ..

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Reflect - , JavaScript . proxy handler. Reflect - , , .

Reflect.apply(): , args. Function.prototype.apply().
Reflect.construct(): new . new target(...args). .
Reflect.defineProperty(): Object.defineProperty(). Boolean.
Reflect.deleteProperty(): delete . delete target[name].
Reflect.enumerate(): for...in. .
Reflect.get(): , .
Reflect.getOwnPropertyDescriptor(): Object.getOwnPropertyDescriptor(). , undefined.
Reflect.getPrototypeOf(): Object.getPrototypeOf().
Reflect.has(): in . Boolean .
Reflect.isExtensible(): Object.isExtensible().
Reflect.ownKeys(): ( ) .
Reflect.preventExtensions(): Object.preventExtensions(). Boolean.
Reflect.set(): , . Boolean true .
Reflect.setPrototypeOf(): , .

const duck = {
  name: "Maurice",
  color: "white",
  greeting: function () {
    console.log(`Quaaaack! My name is ${this.name}`);
  },
};

Reflect.has(duck, "color");
// true
Reflect.has(duck, "haircut");
// false

Reflect.ownKeys(duck);
// [ "name", "color", "greeting" ]

Reflect.set(duck, "eyes", "black");
//  "true"   
//  "duck"    "eyes"   "black"

Specification
ECMAScript 2027 LanguageSpecification # sec-reflect-object

Proxy.
handler.

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This page was last modified on 29 . 2026 . by MDN contributors.

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