JavaScript: Reflect Object

New in ES2015.

Reflect is the value of the property key "Reflect" of the global object.

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

Type of Reflect is object.

〔►see JavaScript: Data Types〕

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

The parent of Reflect is Object.prototype. 〔►see JavaScript: Prototype and Inheritance〕 〔►see JavaScript: Object.prototype〕

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

Purpose of Reflect

The Reflect object is used as namespace to host a group of static functions. (like the Math object. 〔►see JavaScript: Math Object〕 )

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 JavaScript: Object Object〕

〔►see JavaScript: Function Object〕

Properties

• Reflect.get ( obj, key , receiver )
• Reflect.set ( obj, key, val, receiver )
• Reflect.has ( obj, key )

• Reflect.defineProperty ( obj, key, attributes )
• Reflect.deleteProperty ( obj, key )
• Reflect.getOwnPropertyDescriptor ( obj, key )

• Reflect.ownKeys ( obj )
• Reflect.enumerate ( obj )

• Reflect.getPrototypeOf ( obj )
• Reflect.setPrototypeOf ( obj, proto )

• Reflect.isExtensible (obj)
• Reflect.preventExtensions ( obj )

• Reflect.apply ( f, this_binding, argList )
• Reflect.construct ( constructor, argList [, newTarget] )

---

Reflect.get

〔►see JavaScript: Reflect.get〕

Reflect.set

〔►see JavaScript: Reflect.set〕

Reflect.has

〔►see JavaScript: Reflect.has〕

---

Reflect.defineProperty

〔►see JavaScript: Reflect.defineProperty〕

Reflect.deleteProperty

〔►see JavaScript: Reflect.deleteProperty〕

Reflect.getOwnPropertyDescriptor

〔►see JavaScript: Reflect.getOwnPropertyDescriptor〕

---

Reflect.ownKeys

〔►see JavaScript: Reflect.ownKeys〕

Reflect.enumerate

〔►see JavaScript: Reflect.enumerate〕

---

Reflect.getPrototypeOf

〔►see JavaScript: Reflect.getPrototypeOf〕

Reflect.setPrototypeOf

〔►see JavaScript: Reflect.setPrototypeOf〕

---

Reflect.isExtensible

〔►see JavaScript: Reflect.isExtensible〕

Reflect.preventExtensions

〔►see JavaScript: Reflect.preventExtensions〕

Reflect.apply

〔►see JavaScript: Reflect.apply〕

Reflect.construct

〔►see JavaScript: Reflect.construct〕

Reference

ECMAScript 2015 §Reflection#sec-reflect-object