2.0.
Introduction
Classes
are absolutely essential to
ActionScript 3.0. This is truer in ActionScript 3.0 than in any
earlier release of the language. ActionScript 1.0 was essentially a
procedural language with modest object-oriented features.
ActionScript 2.0 formalized the object-oriented features and took a
big step in the direction of a truly object-oriented language.
However, ActionScript 3.0 shifts the core focus of ActionScript so
that the basic building block is that of the class. If you are
using ActionScript 3.0 with Flex, and the introduction of the minor
exception of code being placed within <mx:Script>
tags, all ActionScript code must appear within a class. This
chapter discusses the fundamentals of writing custom classes in
ActionScript 3.0.
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