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Note For another example of using recursion instead of using decision blocks, take a look at Recipe 2-9.
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2-8. Understanding the Ramifications of Duck-Typed Code
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You want to understand where to best use duck typing and the issues you should be aware of when using it.
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Theory
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There is a difference between a value type and a reference type in JavaScript. Even for a reference type, there is a difference between defining the reference as a value or a pure reference. But should you even care about the difference Is it something that you need to be aware of It is when you are trying to do something specific. JavaScript is a unique language in that it has duck type, latent type, and prototype characteristics. To create a type in JavaScript, you can define the type via a prototype definition, or you can define the methods and properties by assigning a class instance. In general, you have the ability to dynamically wire together types at runtime. There are two ways to implement duck typing: value types and reference types. You need to be aware of both types, although in this book I mostly use value-type duck typing. I am not saying one is better than the other just that each has advantages and disadvantages. Developers tend to choose one over the other based on their programming habits. For example, I prefer value duck typing because I tend to serialize objects for later use.
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Let s go through an example of duck typing using reference values. Consider the following code, which is used to create a function without parameters that contains a state. Source: /client/ajaxrestrecipes/javascript/valuevsreferencetypes.js function CallMeReference(toCall, value) { return function() { toCall(value); } } In the preceding code, the CallMeReference function has two parameters: toCall, which is a function, and value, which is the state used to call the function toCall. The idea behind CallMeReference is to create a function that has no parameters, but is called using some state defined earlier. The following code could be used to execute an example: var func = CallMeReference( function( param) { info( "param is (" + param + ")"); }, "hello world"); func();
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In this example, the func variable is used to generate an encapsulated hello world message. The func variable can be called repeatedly, and the same message is generated. The variable could be assigned to other variables and the same message would be generated. Because we are programmers, we will create functions that follow the Builder pattern and precreate functions with certain states. The following two functions implement the Builder pattern: function Version1Reference() { return CallMeReference( function( param) { info( "Ver 1 is (" + param + ")"); }, "hello world"); } function Version2Reference() { return CallMeReference( function( param) { info( "Ver 2 is (" + param + ")"); }, "hello world"); } The Version1Reference and Version2Reference functions generate functions with slight differences. The resulting generated functions can be assigned to variables and then called as in the previous example. Up to this point, everything that I have shown is something you could do using traditional programming languages such as C#, Java, and C++. Here, however, we are using JavaScript, which implements duck typing and prototype-based features, which means that if a function is assigned to a variable, we don t know how that assignment happened. This need to know who did what assignment does not matter in C++, C#, or Java, because the programmer defined the order and layout of the types ahead of time, and during runtime that order cannot be changed. In JavaScript, that order is not defined ahead of time it is defined at runtime. For example, the following code is possible: if( flag) { func = Version1Reference(); } else { func = Version2Reference(); } When func has been assigned, you don t know if it was assigned using the code from Version1Reference or from Version2Reference. When the assigned code is executed, you can logically determine from the behavior if the Version1Reference or Version2Reference function was used. The reason I say that you don t know which code was assigned is because when you serialize the variable func, the following code is generated: function () { toCall(value); } The generated code tells you that the toCall and value variables have been assigned, but you don t know to what. This can become problematic if you are trying to serialize an object that references the generated function. If you serialize the function and attempt to execute the function, an error would be generated because the toCall and value variables would not be defined. You can serialize the state of the data members, but serializing the methods causes state to be lost.
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