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

All the objects created from a constructor function contain all the properties in it?

All the objects created from a constructor function contain all the properties in it?

Constructor function declaration is incorrect.

The syntax to assign properties is wrong.

The `new` keyword should not be used to create a new object instance.

Point out the error in the code below?
```
function Shape(name, sides) {
  name: name
  sides: sides
}
var square = new Shape('Square', 4)
```

Point out the error in the code below?
<pre><code>function Shape(name, sides) {
 name: name
 sides: sides
}
var square = new Shape('Square', 4)
</code></pre>

Code in the constructor function executes every time a new object is instantiated.

Code in the constructor function executes every time a new object is instantiated.

`this` refers to the new object created and is used to set its property values.

<code>this</code> refers to the new object created and is used to set its property values.

What will be the result of the following code?
```
function Shape(name, sides){
  this.name = name
  this.sides = sides
}

Shape.length = 4
var shape1 = new Shape('Square', 4)
console.log("Length is:", shape1.length)
```

What will be the result of the following code?
<pre><code>function Shape(name, sides){
 this.name = name
 this.sides = sides
}

Shape.length = 4
var shape1 = new Shape('Square', 4)
console.log(&quot;Length is:&quot;, shape1.length)
</code></pre>

Properties/methods added to the prototype object of the constructor function cannot be inherited by the objects created from it. 

Properties/methods added to the prototype object of the constructor function cannot be inherited by the objects created from it.

Declaring properties using the `var` keyword makes them accesible outside the constructor function.

Declaring properties using the <code>var</code> keyword makes them accesible outside the constructor function.

A short quiz to test your understanding of functions in OOP in JavaScript.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Quiz