Learn to write cleaner, more modular, and more scalable code in JavaScript by gaining mastery of Object Oriented Programming (OOP). 

You'll start with the basics of object-oriented programming and build up to more advanced concepts such as prototypal inheritance, prototype chaining, method overriding and mixins. Along the way, you'll learn how each concept applies to JavaScript's sometimes unique way of handling things. You'll also see how various JavaScript features make it particularly convenient for OOP, with particular emphasis on changes introduced in ES6.

This course is filled with hands-on coding challenges, playgrounds, snippets, and illustrations to keep things interactive.

Learn Object-Oriented Programming in JavaScript

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

All 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 accessible outside the constructor function.

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

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

Introduction

Objects in JavaScript

Functions as Objects

OOP in JS - Exam 1

Classes

Inheritance

OOP in JS - Exam 2

Quiz