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

As discussed in the [first](https://www.educative.io/collection/page/5429798910296064/5907042445295616/4688091048574976) chapter, the ES6 version of JavaScript offers some new features as well as improvements. One of those improvements that were discussed was the introduction of the *keyword* `class`.

In the [previous](https://www.educative.io/collection/page/5429798910296064/5907042445295616/5026890232365056) chapter, we discussed *function constructors*, which are used in the ES5 version to implement the concept of classes. However, in the ES6 version, the `class` keyword is used which cleans up the syntax for implementing the same concept hence making it easier to understand.

# What Is a Class?

We discussed that in the ES5 version there is no concept of classes. What we needed was a blueprint containing all properties and methods which could then be inherited by the object instances created from that blueprint. This saves us the time and effort to create separate object literals. The ES6 version introduces the `class` *keyword* to create classes which are used to implement this functionality. The classes created then become the blueprints from which the objects inherit their properties.


This lesson introduces the ES6 version of classes, their syntax and also teaches how to create new object instances using a class.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Implementing Classes