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You encountered static JavaScript methods when we talked about the extended Array object in chapter 2. Now, we ll introduce literals, which are notations for representing values. In JavaScript, you can use literals to represent nearly every data type, including objects, arrays, and functions. Having a good knowledge of JavaScript literals will enable you to write compact, elegant, fast code.

the parameter type for the lambda must be a Document. You even get full IntelliSense on your lambda parameters in Visual Studio.

It is well worth getting used to reading and writing lambdas; you ll find them to be a very useful and expressive means of defining short functions, especially when we look at various aspects of the LINQ technologies and expression composition in later chapters. Most developers, once they get over the initial comprehension hurdles, fall in love with lambdas I promise!

The delegates we ve seen so far have taken one or more parameters, and returned either void (an Action<>) or a bool (a Predicate<T>). But we can define a delegate to any sort of function we like. What if we want to provide a mechanism that allows the client to be notified when each processing step has been completed, and provide the processor with some text to insert into a process log Our callback delegate might look like this:

delegate string LogTextProvider(Document doc);

Function Members (Execute Code)

We could add a property to our DocumentProcessor so that we can get and set the callback function (see Example 5-16).

class DocumentProcessor { public LogTextProvider LogTextProvider { get; set; } // ... }

And then we could make use of it in our Process method, as shown in Example 5-17.

public void Process(Document doc) { // First time, do the quick check foreach (ActionCheckPair process in processes) { if (process.QuickCheck != null && !process.QuickCheck(doc)) { Console.WriteLine("The process will not succeed."); if (LogTextProvider != null)

Previously, you saw that the declarations of fields and methods can include modifiers such as public and private. In this chapter, I will discuss a number of additional modifiers. Since many of these modifiers can be used together, the question that arises is: what order do they need to be in Class member declaration statements consist of the following: the core declaration, an optional set of modifiers, and an optional set of attributes. The syntax used to describe this structure is the following: [ attributes ] [ modifiers ] CoreDeclaration

In programming languages, a literal is a notation for representing a value. For example, "Hello, World!" represents a string literal in many languages, including JavaScript. Other examples of JavaScript literals are 5, true, false, and null, which represent an integer, the two Boolean values, and the absence of an object, respectively. JavaScript also supports literals for objects and arrays and lets you create them using a compact and readable notation. Consider the following statements which create an object with two properties called firstName and lastName:

{

}

}

Console.WriteLine(LogTextProvider(doc)); } return;

The modifiers, if any, must be placed before the core declaration. The attributes, if any, must be placed before the modifiers and core declaration. The square brackets indicate that the set of components inside them is optional.

}

// Then perform the action foreach (ActionCheckPair process in processes) { process.Action(doc); if (LogTextProvider != null) { Console.WriteLine(LogTextProvider(doc)); } }

Notice that we re checking that our property is not null, and then we use standard delegate syntax to call the function that it references. Let s set a callback in our client (see Example 5-18).

static void Main(string[] args) { // ... DocumentProcessor processor = Configure(); processor.LogTextProvider = (doc => "Some text for the log..."); } // ...

When a declaration has multiple modifiers, they can be placed in any order, before the core declaration. So far, I ve only discussed two modifiers: public and private. When there are multiple attributes, they can be placed in any order, before the modifiers. I ll discuss attributes in 21. For example, public and static are both modifiers that can be used together to modify certain declarations. Since they re both modifiers, they can be placed in either order. The following two lines are equivalent: public static int MaxVal; static public int MaxVal; Figure 6-1 shows the order of the components as applied to the member types shown so far: fields and methods. Notice that the type of the field and the return type of the method are not modifiers they are part of the core declaration.

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