JavaScript Absolute Beginner’s Guide

3. Functions

In This Chapter

• Learn how functions help you better organize and group your code

• Understand how functions make your code reusable

• Discover the importance of function arguments and how to use them

So far, all of the code we’ve written contained virtually no structure. It was just...there:

alert("hello, world!");

There is nothing wrong with having code like this. This is especially true if your code is made up of a single statement. Most of the time, though, that will never be the case. Your code will rarely be this simple when you are using JavaScript in the real world for real-worldy things.

To highlight this, let’s say we want to display the distance something has traveled (see Figure 3.1).

FIGURE 3.1 The distance something ...