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

# What are Mixins?

So far you've learned that for a class to call *methods* from another class it needs to inherit those methods first. Thus the child class extends the parent class, inherits its methods, and then invokes them. However, there is a limiting factor; a class can only inherit from one other class only.

That brings us to the question. 

Is there a class whose methods can be inherited by other classes without it having to be their parent class? This is where **mixins** are implemented.

A **mixin** is a class that contains various methods that implement different functionalities. Other classes can then inherit those methods without the *mixin* class having to be their parent class.

>**Note:** A mixin class is not used alone. It only provides other classes with extra *methods*.

# Syntax

Let's take a look at the syntax to implement a mixin:

This lesson teaches the concept of mixins in JavaScript, their syntax, and implementation using an example.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Mixins

What are Mixins?