JavaScript is one of the most popular languages used by programmers all around the world. In this course, you'll be introduced to the Object-Oriented Paradigm of JavaScript. The course will discuss OOP in both, ES5 and ES6 versions of JavaScript. It begins with a basic introduction to what Object-Oriented programming is, followed by its comparison to other languages. It then introduces the new  OOP features available in ES6 version and compares it to the ES5 version. The course then discusses objects in JavaScript followed by the use of function as objects in OOP. It goes over the interesting concepts of prototype objects, data encapsulation, and classes. It then delves into the more complex concepts of inheritance in both the versions, including prototypal inheritance, prototype chaining, method overriding and mixins. The course is filled with interesting illustrations to help in your understanding of the concepts as well as numerous quizzes and exercises to help you practice.

Learn Object-Oriented Programming in JavaScript

# Functions as Objects
As discussed [previously](https://www.educative.io/collection/page/5429798910296064/5907042445295616/4789534149574656) functions are also objects in JavaScript. This is because just like objects, they have their own properties and methods as well. Functions can be used to construct objects as well, and these type of functions are known as the **constructor functions**.

This lesson discusses why constructor functions are used in JavaScript.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Objects or Constructor Functions?

Functions as Objects