Explore the basics of JavaScript in greater detail to solve real-world problems.

Zero to Hero in JavaScript

This module aims to teach us how to write cleaner, more modular, and more scalable code in JavaScript by giving us an understanding of object-oriented programming (OOP). We'll start with the basics of object-oriented programming and build up to more advanced concepts such as data protection and inheritance. Along the way, we'll learn how each concept applies to JavaScript in particular, as well as how various JavaScript features make it a suitable language for object-oriented programming.

JavaScript: A Deep Dive

# Background

Have you ever wondered: who can *access* a variable that you *declare*? Imagine *assigning* a variable to a password or encryption key; if either is compromised, your whole system is compromised. In this scenario, you are likely to restrict access to the variables. You can keep these variables where they can’t be *accessed*. In fact, you can even *reuse* variable names in multiple scenarios without worrying about duplicate names and overwriting its value.




In the programming world, this *restriction* of *access*, or creating boundaries within which a variable is *accessible*, is done through the **scope** of the variable.

# Introduction
The **scope** is the extent to which a variable is *accessible* throughout the program at run-time. In other words, scope partitions the visibility of variables and resources throughout the program.

Scope Introduction

Background