React: Building Modern Web Applications

Object

ES6 standardizes the __proto__ property of an object and adds new properties to the global Object object.

The __proto__ property

JavaScript objects have an internal [[prototype]] property that references the object's prototype, that is, the object it inherits. To read the property we had to use Object.getPrototypeof() and to create a new object with a given prototype we had to use the Object.create() method. A [[prototype]] property cannot be directly read or be modified.

Inheriting was cumbersome due to the nature of the [[prototype]] property, therefore some browsers added a special __proto__ property in objects, which is an accessor property that exposes the internal [[prototype]] property and makes working with prototypes easier. The ...