Sealed classes in .NET

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ActionScript 3.0 introduces the concept of sealed classes. A sealed class possesses only the fixed set of properties and methods defined at compile time; additional properties and methods cannot be added. This enables stricter compile-time checking, resulting in more robust programs. It also improves memory usage by not requiring an internal hash table for each object instance. Dynamic classes are also possible using the dynamic keyword. All classes in ActionScript 3.0 are sealed by default, but can be declared to be dynamic with the dynamic keyword.
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ActionScript 3.0 enables a method closure to automatically remember its original object instance. This feature is useful for event handling. In ActionScript 2.0, method closures would not remember what object instance they were extracted from, leading to unexpected behavior when the method closure was invoked. The mx.utils.Delegate class was a popular workaround, but it is no longer needed.
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ActionScript 3.0 implements ECMAScript for XML (E4X), recently standardized as ECMA-357. E4X offers a natural, fluent set of language constructs for manipulating XML. In contrast to traditional XML-parsing APIs, XML with E4X performs like a native data type of the language. E4X streamlines the development of applications that manipulate XML by drastically reducing the amount of code needed. To view ECMA s E4X specification, go to files/ECMA-ST/ECMA-357.pdf.
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ActionScript 3.0 includes native support for regular expressions so that you can quickly search for and manipulate strings. ActionScript 3.0 implements support for regular expressions as they are defined in the ECMAScript edition 3 language specification (ECMA-262).
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Namespaces are similar to the traditional access specifiers used to control visibility of declarations (public, private, protected). They work as custom access specifiers, which can have names of your choice. Namespaces are outfitted with a Universal Resource Identifier (URI) to avoid collisions and are also used to represent XML namespaces when you work with E4X.
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ActionScript 2.0 has a single numeric type, Number, a double-precision, floating-point number. ActionScript 3.0 contains the int and uint types. The int type is a 32-bit signed integer that lets ActionScript code take advantage of the fast integer math capabilities of the CPU. The int type is useful for loop counters and variables where integers are used. The uint type is an unsigned, 32-bit integer type that is useful for RGB color values, byte counts, and more.
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Classes are used to store methods and properties in a manner that is both intuitive and reusable. All the classes used in this book are located in the folder org/airbible and are represented in ActionScript as org.airbible. Interfaces define methods that must be implemented by a class but do not provide functionality.
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ActionScript 3.0 class packages are nearly identical to ActionScript 2.0 packages; they are folders that contain categorized classes that can be addressed in dot syntax. Typically a package is structured in a unique folder path that indicates their origin. In ActionScript 2.0 it was possible to directly refer to a class in ActionScript using the package and class names without using the import statement to refer to a class, like this:
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// access the method method in the class Class com.airbible.package.Class.method();
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This is no longer possible in ActionScript 3.0, and the import statement must be used to refer to a class like this:
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// use import to refer to a class import com.airbible.package.Class Class.method();
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Part II
Programming for AIR Essentials
Classes are the blueprints of objects used in object-oriented language. In ActionScript and most object-oriented languages, a class is a file whose contents define the behaviors of an object, or instances of objects. In previous versions of ActionScript, code was often written on the frames of the timeline of an FLA file in Flash, or in an include file. However, ActionScript 2.0 classes and interfaces have become not only supported features in ActionScript but also immensely important tools for developing rich Internet applications.