JS: Reflect

New in ES2015.

Reflect is the value of the property key "Reflect" of the global object. [JS: the Global Object]

console.log ( window["Reflect"] === Reflect ); // true

Type

Type of Reflect is object.

[see JS: Value Types]

// type of Reflect
console.log ( typeof Reflect === "object" ); // true
console.log ( Object.prototype.toString.call(Reflect) === "[object Object]" ) // true

Parent

Parent of Reflect is Object.prototype. [see JS: Prototype and Inheritance] [see JS: Object.prototype]

console.log ( Reflect.getPrototypeOf ( Reflect ) === Object.prototype); // true

Purpose

The Reflect object is used as namespace to host a group of static functions. (like the Math object. [see JS: Math] )

Reflect's methods typically:

• Provides a function form of operators. For example, Reflect.get ( obj, key ) is the same as obj[key]
• Provide a more strict/improved version of existing methods. For example, Reflect.getPrototypeOf(obj) is same as Object.getPrototypeOf(obj), but will throw error if obj is not a object type.

[see JS: Object Object]

[see JS: Function Object]

Properties

• Reflect.get
• Reflect.set
• Reflect.has

• Reflect.defineProperty
• Reflect.deleteProperty
• Reflect.getOwnPropertyDescriptor

• Reflect.ownKeys
• Reflect.enumerate[see JS: Reflect.enumerate]

• Reflect.getPrototypeOf
• Reflect.setPrototypeOf

• Reflect.isExtensible
• Reflect.preventExtensions

• Reflect.apply
• Reflect.construct

Reference

ECMAScript 2015 §Reflection#sec-reflect-object