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

In the [first](https://www.educative.io/collection/page/5429798910296064/5907042445295616/5149595619295232) exercise, you created an object named `product` with certain *properties* defined. This exercise is a continuation of it. 

## Problem Statement

In this exercise, you are required to write a function `totalBill` that *returns* the total bill after the customer buys that product.

>**Note:** Assume all prices are in *dollars*.

The *object* from the previous exercise is already given below however the property values are not set. You can set them to whatever you want. The skeleton of the function is already given you just need to write its implementation.



### Sample Input

* `name`: **Cheese**

* `price`: **20**
* `amount`: **10**
* `madeIn`: **USA**

### Sample Output

`totalBill` returns **200 dollars**.

>**Note:** Solution to this exercise is available in the code widget below. However, it'll be a good practice to solve this problem yourself first. Goodluck!



In the [first](https://www.educative.io/collection/page/5429798910296064/5907042445295616/5149595619295232) exercise, you created an object named `product` with certain *properties* defined. This exercise is a continuation of it. 

# Problem Statement

In this exercise, you are required to write a function `totalBill` that *returns* the total bill after the customer buys that product.

>**Note:** Assume all prices are in *dollars*.

The *object* from the previous exercise is already given below however the property values are not set. You can set them to whatever you want. The skeleton of the function is already given you just need to write its implementation.



## Sample Input

* `name`: **Cheese**

* `price`: **20**
* `amount`: **10**
* `madeIn`: **USA**

## Sample Output

`totalBill` returns **200 dollars**.

>**Note:** Solution to this exercise is available in the code widget below. However, it'll be a good practice to solve this problem yourself first. Goodluck!



In this exercise, you will be required to add a function, totalBill, as a property in the object and implement it as well.

Introduction

Objects in JavaScript

Functions as Objects

Classes

Inheritance

Exercise 3: How much is the Bill?