By Joey Lott
Cutting-edge ActionScript-based purposes require more and more subtle architectures and code. This e-book aids intermediate and complicated ActionScript builders in studying the best way to plan and construct functions extra successfully. you will follow layout styles as recommendations to universal programming eventualities. past a reference, complex ActionScript with layout styles is a realistic advisor entire with pattern mini-applications illustrating each one layout trend. The accompanying CD features a trial model of Flash eight in addition to all of the lesson documents had to paintings with the textual content.
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In this case _service is typed as INetworkProtocol. Since AMFService, XMLService, and BinarySocketService all implement INetworkProtocol, it's possible to assign instance of any of those classes to _service. 44 Part I: Successful Projects Part II: Patterns 45 Summary Interfaces are the backbone of good application design. Interfaces emphasize type rather than implementation. By programming to interfaces rather than to concrete implementations, you increase the flexibility in your applications. This flexibility comes about because of the reduction of dependency on implementation.
The difficulty with that strategy is that it requires the development team to be responsible for testing the application. If developers could handle testing in addition to development and bug fixes then there wouldn't be a need for a QA team in the first place, so it might almost seem ridiculous to suggest that developers should have to test an application. However, if developers can run automated tests that verify that an application continues to work correctly from a programmatic standpoint then that doesn't require a great deal more work on the part of the developer, and it enables developers to quickly identify errors before sending a build to QA.
Because you've declared item as type Vegetable, you can assign to it only those objects that are instances of class Vegetable or its subclasses. Even if class Fruit has the exact same interface as class Vegtable, you cannot assign an instance of class Fruit to item when you declare item as in the preceding example. To write more flexible code, you have to differentiate between class and type. In the preceding example, Vegetable is both a class and the type. However, there's a correspondence between a type and an interface and between a (concrete) class and an implementation.