3D Game Programming for Kids

Chapter 5Functions: Use and Use Again

When you’re done with this chapter, you will

• Understand a superpowerful tool (functions) for programmers

• Know two reasons to use functions

• Recognize some common JavaScript errors and know how to fix them

We’ve come across functions more than once. Most recently we saw them in Chapter 4, ​Project: Moving Avatars​, where we used them to make a forest. If you were paying close attention, you may have noticed that we also used a function to build the keyboard event listener in the same chapter.

Although we have used functions already, we haven’t talked much about them. You may already have a sense that they are pretty powerful, so let’s take a closer look now.

We’re not going to talk about every aspect of ...