Question

How can we make methods available on all objects?

(a) Object.add(methods)

(b) Object.methods(add)

(c) Object.add.methods(…)

(d) Object.prototype

I have been asked this question in final exam.

The query is from Augmentation of Classes in chapter Classes and Modules in JavaScript of JavaScript

Answer 1

Right choice is (d) Object.prototype

Easiest explanation: It is possible to add methods to Object.prototype, making them available on all objects. This is not recommended, however, because prior to ECMAScript5, there is no way to make these add-on methods non enumerable, and if you add properties to Object.prototype, those properties will be reported by all for/in loops.