Reflect

Reflect new Reflect Reflect Math

Reflect proxy handler

Reflect.apply(target, thisArgument, argumentsList)

Function.prototype.apply()

Reflect.construct(target, argumentsList[, newTarget])

new new target(...args)

Reflect.defineProperty(target, propertyKey, attributes)

Object.defineProperty() true

Reflect.deleteProperty(target, propertyKey)

delete delete target[name]

Reflect.get(target, propertyKey[, receiver])

target[name]

Reflect.getOwnPropertyDescriptor(target, propertyKey)

Object.getOwnPropertyDescriptor() undefined

Reflect.getPrototypeOf(target)

Object.getPrototypeOf()

Reflect.has(target, propertyKey)

in

Reflect.isExtensible(target)

Object.isExtensible().

Reflect.ownKeys(target)

( Object.keys(), enumerable ).

Reflect.preventExtensions(target)

Object.preventExtensions()Boolean

Reflect.set(target, propertyKey, value[, receiver])

Booleantrue

Reflect.setPrototypeOf(target, prototype)

Boolean true

Examples

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');
// returns "true" if successful
// "duck" now contains the property "eyes: 'black'"

ECMAScript 2027 LanguageSpecification # sec-reflect-object

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