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ActionScript is the scripting language used by Macromedia Flash. It makes your Flash content interactive. ActionScript provides a more efficient way to do things in Flash, from creating simple animations through designing complex, data-rich, interactive application interfaces. As the scripting language for Macromedia Flash, ActionScript has evolved incrementally over many releases. There are two versions of ActionScript: ActionScript 1.0 and ActionScript 2.0.
ActionScript 1.0, the less formal version of ActionScript, is fine for most general purposes and when you want to target an old version of Flash Player. Want to generate some simple interactivity when a user clicks a button? Want to create an application for a mobile device? Go with ActionScript 1.0. But for creating more complex code, ActionScript 2.0 is more appropriate.
ActionScript 2.0 is an object-oriented programming language that supports full class inheritance and all the features that developers demand from a mature language. It gives you a more flexible programming environment and superior debugging abilities. At the heart of ActionScript 2.0 is a formal and familiar approach to object-oriented programming (OOP), including full support for classes, inheritance, interfaces, and other common OOP concepts. ActionScript 2.0 also includes features that enhance ActionScript programming, such as variable data typing, function parameters and return types, and comprehensive debugging information. ActionScript 2.0 benefits developers by encouraging better programming structures and reducing coding and maintenance time. Want to write code using a formal programming language with more robust capabilities? Go with ActionScript 2.0.
To find out whether ActionScript 2.0 is right for your project or whether ActionScript 1.0 is the simpler, faster solution, check out the following resources, so you can make the call and be as efficient as possible for every project.

• If you are new to ActionScript, read first about the syntax and fundamentals of the language in LiveDocs. Select Learning ActionScript 2.0 in Flash and read two sections: Data and Data Types and Syntax and Language Fundamentals.
• To understand the differences between ActionScript 1.0 and 2.0, start with Choosing between ActionScript 1.0 and 2.0 and Migrating to ActionScript 2.0.
• To compare advantage object-oriented coding in ActionScript 1.0 and 2.0, read the following:
  • For ActionScript 1.0, read Object-Oriented Programming with ActionScript 1.0 in the Learning ActionScript 2.0 section of LiveDocs.
  • For ActionScript 2.0, read Object-Oriented Programming section below and the Classes section of Learning ActionScript 2.0 in LiveDocs.