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In addition to the ActionScript core language elements and constructs (for and while loops, for example) and primitive data types (numbers, strings, and arrays) described earlier (see ActionScript Basics), ActionScript also provides a number of built-in classes, or complex data types. These classes provide you with a variety of scripting features and functionality.
Some of these classes are based on the ECMAScript specification and are referred to as core ActionScript classes. These classes include the Array, Boolean, Date, and Math classes. For more information, see Core classes.)
The rest of the built-in ActionScript classes are specific to Macromedia Flash and Flash Player object model. To understand the distinction between core ActionScript classes and those specific to Flash, consider the distinction between core and client-side JavaScript: just as client-side JavaScript classes provide control over the client environment (the web browser and web page content), the classes specific to Flash provide runtime control over the appearance and behavior of a Flash application.
This chapter introduces the built-in ActionScript classes, describes common tasks you can perform with these classes, and provides code examples. For an overview of these classes, see Overview of built-in classes. For an overview of working with classes and objects in object-oriented programming, see About classes and instances.
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