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

If we create 50 Animal object instances, how many definitions of method `getName` and property `name` will we have?

```
function Animal(name,age ) {
    this.name = name
    this.age = age
}
Animal.prototype.getName = function() {
    return this.name
}
Animal.prototype.getAge = function() {
    return this.age
}
```

If we create 50 Animal object instances, how many definitions of method <code>getName</code> and property <code>name</code> will we have?
<pre><code>function Animal(name,age ) {
 this.name = name
 this.age = age
}
Animal.prototype.getName = function() {
 return this.name
}
Animal.prototype.getAge = function() {
 return this.age
}
</code></pre>

Whenever a property is to be found it is first searched in the object and then the prototype chain is traversed.

Whenever a property is to be found it is first searched in the object and then the prototype chain is traversed.

Which `name` will be displayed in the code below? 

```
function Animall(name,age ) {
    this.name = name
    this.age = age
}
Animal.prototype.name = 'Roofy'
var animal = new Animal('Kitty',2)
console.log(animal.name)
```

Which <code>name</code> will be displayed in the code below?
<pre><code>function Animall(name,age ) {
 this.name = name
 this.age = age
}
Animal.prototype.name = 'Roofy'
var animal = new Animal('Kitty',2)
console.log(animal.name)
</code></pre>

`Object.prototype` always points to another object.

<code>Object.prototype</code> always points to another object.

The `__proto__` property is used as a setter/getter for the `[[Prototype]]` property.

The <code>__proto__</code> property is used as a setter/getter for the <code>[[Prototype]]</code> property.

`call` is used to used to invoke a method defined anywhere in the current context.

<code>call</code> is used to used to invoke a method defined anywhere in the current context.

`super` keyword is used to invoke child class methods and constructors.

<code>super</code> keyword is used to invoke child class methods and constructors.

In Javacript inheritance is implemented through mixins?

In Javacript inheritance is implemented through mixins?

A short quiz to test your understanding of Inheritance in JavasScript.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Quiz