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We ve now reviewed various ways of creating and using objects in JavaScript But, after all, this is a Dojo book and not simply a JavaScript bookWhat role does Dojo play, if any, in helping us to use objects There is a certain amount of complexity in using objects in JavaScriptYour goal may be a simple one: creating a template from which new objects of a particular type may be built But JavaScript provides many features for doing this from the use of prototypes to constructors to private membersThough JavaScript provides a number of ways to create and use objects, all of them are problematic and inconvenient at bestThe developers of Dojo, working to create a JavaScript toolkit, faced the same problems all JavaScript developers do Luckily, the Dojo developers created something better: an idiom and supporting code for defining classes Dojo provides value by giving us a standard idiom for defining classes (the templates from which objects are built) An idiom is a specific syntactic structure for a language Dojo provides us with this specific structure in the form of a function call with various parameters to allow the definition of a classWe will achieve our goal of creating an object class definition in a single standard Dojo function call And, drum roll please, that function is dojodeclare!

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assertTrue(didReturn); assertTrue(wasCalled); assertEquals(calledName, "federico"); assertEquals(calledPass, "eduardo"); } }

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The dojodeclare function is used to create a constructor that can be used to create object with the new keyword It can also automatically create a prototype with properties and methods A prototype chain can also be created automaticallyThis is a very powerful function and is used extensively throughout the Dojo library code It is also one of the most common functions that you will use in your own application code So spending some time learning how to use this function properly is certainly time well spent Let s examine a number of typical scenarios that may appear in your application code when you wish to create a new class definition First let s look at the simplest possible usage for dojodeclareWe ll create a constructor for a new type of object that doesn t even provide any properties, methods, or superclasses for the object

Summary

22 This isn t that usual; normally, we just test things that are available through a declared interface but why not Having the test class and the tested class in the same package allows for these kind of inner checks

dojodeclare("DataItem"); d1 = new DataItem();

This chapter covered the architecture of message queuing and how to implement queued components With queued components, you can increase the overall scalability of your solution and give independent lifetimes to client and server applications When applying the attribute [InterfaceQueuing], you can create message queues automatically With the client application, it is obvious that queued components are based on COM technology, because a COM queued moniker is needed to instantiate the recorder When using queued components, error handling must be implemented differently from other applications, because the client and the server might not be running concurrently Functionality for this issue is built in to the technology with error components

In the preceding code the object d1 contains the following properties and methods:

With Web services, the wsdlexe utility creates a class that offers both synchronous and asynchronous methods Many other classes that do network or data access also offer both synchronous and asynchronous methods You can also use delegates to invoke any method in an asynchronous way

All the other checks, such as if a method were called unexpectedly, or with unexpected parameters, are done by EasyMock, so it s still possible that the test will fail, even if it didn t produce an error so far Using EasyMock is a great way to simplify your tests, and gives you enough latitude to provide for the most complicated test situations (Note, for example, how much shorter and easy to understand were our EasyMock tests than our hand-written login service mock ) If you manage to set up the Presenter tests with EasyMock, the usually most complex parts of your applications will be easily tested, and at full speed, which doesn t happen with the browser-based tests we shall be considering in the next sections

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{ "preamble": null, "_initializer": null, "declaredClass": "DataItem" }

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