Reflect

Baseline

20169

Reflect JavaScript

Reflect new Reflect Reflect Math

Reflect

ReflectProxyReflect API p deleteProperty [[Delete]] Reflect.deleteProperty() [[Delete]] targetObject delete Reflect

const p = new Proxy(
  {},
  {
    deleteProperty(targetObject, property) {
      // : 
      console.log(":", property);

      // 
      return Reflect.deleteProperty(targetObject, property);
    },
  },
);

Reflect Reflect.construct() new.target new new.target Reflect.get() this this

Reflect Object Reflect

Reflect[Symbol.toStringTag]: [Symbol.toStringTag] "Reflect" Object.prototype.toString()

Reflect.apply(): target argumentsList Function.prototype.apply()
Reflect.construct(): new new target(...argumentsList)
Reflect.defineProperty(): Object.defineProperty() true
Reflect.deleteProperty(): delete delete target[propertyKey]
Reflect.get(): (target[propertyKey])
Reflect.getOwnPropertyDescriptor(): Object.getOwnPropertyDescriptor() undefined
Reflect.getPrototypeOf(): Object.getPrototypeOf()
Reflect.has(): in
Reflect.isExtensible(): Object.isExtensible() true
Reflect.ownKeys(): ()
Reflect.preventExtensions(): Object.preventExtensions() true
Reflect.set(): true
Reflect.setPrototypeOf(): true

const duck = {
  name: "Maurice",
  color: "white",
  greeting() {
    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'"


ECMAScript 2027 LanguageSpecification # sec-reflect-object

Proxy

MDN

MDN 202635

GitHub

Reflect