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The Elvis operator ( :) is a shorthand version of the Java ternary operator.29 An example of using the Java-style ternary operator is a == 1 "One" : "Not One". If a is equal to 1, then "One" is returned; otherwise "Not One" is returned. It is literally a shorthand if-thenelse. As with most Java constructs, you can use the Java ternary operator in Groovy. In addition to the Java ternary operator, you can use an even shorter shorthand notation in Java: the Elvis operator. This can be very useful in defaulting values if they haven t been set already, meaning that they evaluate to null or false. Listing 2-36 illustrates using the Java ternary and Elvis operators in Groovy.

namespace chapter12test { [TestClass] public class ValidatorsTests : SilverlightTest { [TestMethod] public void TestRangeTooLow() { Assert.IsFalse(Validators.validateRange(0, 10, 20)); } [TestMethod] public void TestRangeAtUpperBound() { Assert.IsTrue(Validators.validateRange(20, 10, 20)); } } } Initially with the previous two tests, the TestRangeTooLow test will succeed and the TestRangeAtUpperBound will fail. The Assert class provides a number of methods to verify conditions to indicate test success. If the conditions are not met, an exception is thrown automatically and is caught by the unit testing framework, informing you of the test failure. Now right-click the 12TestPage.html page under the 12.Web project and select the View Browser option or press Ctrl+F5 to run the project without debugging mode. All tests will execute immediately. An AssertFailedException exception will be raised if the TestRangeAtUpperBound test fails. You will see the output shown in Figure 12-2.

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def firstName = user.firstName == null "unknown" : user.firstName // Java ternary def firstName2 = user.firstName : "unknown" // Groovy Elvis

Figure 12-2. Unit testing framework output with a failing test Now if you click the Copy all failing results link in the test output, you can see the failing results in details (as shown in Figure 12-3), which you can copy for further evaluation.

My bookkeeping needs are small, and the general ledger system described in this chapter is simple for both data entry and reporting. The latter is often done with a one-off script that I discard. If I need to expand the database, adding more fields means less than a dozen lines of additional code. Both scripts will run in any POSIX shell, but they are enhanced when interpreted by bash2+.

In both cases, if the user.firstName is null, then the firstName is set to "unknown". The user.firstName portion of the Elvis operator example is known as the expression. If the expression evaluates to false or null, then the value after the : is returned. The two lines in the example are logically equivalent.

Windows Presentation Foundation (WPF), because the document outline focuses on what is explicitly found in the XAML. For example, if a ListBoxItem contains a Content attribute, the type-converted string is not shown. However, creating a Button as a child of a ListBoxItem will cause the Button to show up in the document outline.

The safe navigation/dereference operator ( .) is used to avoid NullPointerExceptions, so it is incredibly handy. Consider the situation where you have a User object and you want to print the firstName. If the User object is null when you access the firstName property,

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you will get a NullPointerException. Listing 2-37 illustrates the Java way of safe dereferencing and using the Groovy safe navigation/dereference operator. Listing 2-37. Using the Safe Navigation/Dereference Operator

We ll now elaborate on the XAML file structure. Two important namespaces appear in the root element of each XAML file. (Expression Blend adds a couple others, but we ll look at the two most important here.) The first is the default namespace, specified by xmlns="http://schemas. microsoft.com/winfx/2006/xaml/presentation". This namespace contains the various elements that correspond to objects in Silverlight, such as UserControl, Canvas, and Grid. If you remove this declaration from a XAML file in Visual Studio, blue squiggly lines will show just how much is defined in this namespace. The other namespace declaration contains Silverlight-specific extensions. Elements in this namespace are assigned to the x scope. While this is a convention, it is one that Silverlight and all Silverlight documentation follow. Table 2-1 describes the most important aspects of this namespace.

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