JavaScript Absolute Beginner's Guide, 2nd Edition

8. Variable Scope

In This Chapter

• • Understand global scope

• • Familiarize yourself with the various techniques available for using local scope

• • Learn about some quirks that might cause your code to behave unpredictably

Let’s revisit something relating to variables we saw a few chapters ago. Each variable we declare has a certain level of visibility that determines when we can actually use it. In human-understandable terms, just because we declare a variable doesn’t mean that it can be accessed from anywhere in our code. There are some basic things we need to understand, and this whole area of understanding falls under a topic known as variable scope.

In this tutorial, I’m going to be explaining variable scope by looking at common cases ...