The most important knowledge about ActionScript and object-oriented programming that you can possess is knowing how to work with objects and classes. You may remember from reading Chapter 1 that everything in ActionScript is an object. A MovieClip is an instance of the
MovieClip class; a Sprite is an instance of the
Sprite class, and so on.
Because objects and classes are so central to working with ActionScript, nearly every chapter of this book delves into working with classes and objects. You will have gained plenty of experience with them by the time you’ve finished reading and working through the step-by-step instructions. But before you move on, you must understand the basic concepts, terminology, ...