When Flash Player 9 released in June 2006, it introduced the new  scripting language, ActionScript 3, which has already taken hold in the  Adobe Flex application development community. ActionScript 3 provides  not only a significant enhancement in performance, but also a more  robust programming model that lends itself to complex Rich Internet  Application development. For web designers and developers who need to  make the move to ActionScript 3 from the previous version, ActionScript  2, the learning curve has proven to be significant. In this essential  and timely guide, ActionScript expert Kris Hadlock speaks squarely to  the many thousands of ActionScript 2 users who need to make the leap  right away. The ActionScript Migration Guide covers all of the major  changes in ActionScript from version 2 to 3. The book explains the most  important and fundamental changes in ActionScript drawing comparisons  between the two languages both visually and contextually. With a  comprehensive index and robust table of contents designers and  developers will easily be able to locate the old an/or new codes with  side-by-side comparisons of how to program both and the explanation of  the concepts behind them.

The ActionScript 3.0 Migration Guide: Making the Move from ActionScript 2.0 PDF

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