What are the key differences between JavaScript and ActionScript 3?

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First of all ActionScript 3 and JavaScript are both defined in ECMA-262 so they have a lot in common. Both languages feature prototype inheritance for instance. It is however not correct that ActionScript fully implements ES4.

ActionScript implements a couple of features that are not defined in ECMA-262 and some — but definitely not all — of ES4.

So what does AS3 add to ECMA-262? Those are also the differences to JavaScript:

  • Dynamically and statically typed code
  • Packages, Classes and Interfaces
  • Standard OO inheritance model (not prototype based, statically typed)
  • uint and int datatype
  • E4X (ECMA-357)
  • Type-safe conditional compilation (ES4)
  • Vector.<T> datatype (ES4)

Maybe I have forgotten some features. I am not sure if XML, XMLList etc. are already defined in 262 or came with 357.

The key difference however is the standard library. JavaScript comes with a couple of predefined classes like DOMElement and browser dependent additions. ActionScript has a fairly large standard library with features like video streaming and is consistent over all platforms.

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