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CHAPTER 2 JAVASCRIPT RECIPES
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with an object, where a property of the object might reference a number, is not something we expect the addition function to figure out. Here we expect an error to be generated. The code that is not expected to work, or at least can be expected to fail, is wrapped in an exception block. The role of the expectation is required in both the function and the caller of the function, as illustrated in the example. In JavaScript, functions must meet certain expectations, so you should observe the following points when writing them: Variables are not declared using types, and when the variables are not assigned they are considered typeless. Once assigned, variables look, feel, and behave like types. When implementing functions, you are writing blocks of code that implement expectations. To properly meet expectations, you need to write tests. When expectations are not met, the errors should be obvious and their accompanying messages should be explanatory. If you want to verify what type a variable is, use typeof. Do not use a simple object or check. When implementing expectations, don t be paranoid and attempt to create a type system by verifying the exact details of every variable and every parameter.
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2-2. Coding Using Conventions and Not Configurations
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You want to make your JavaScript constructs more efficient by applying the Rails convention over configuration principle to them.
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Theory
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You may already be familiar with the programming platform Ruby on Rails, which is used to build Web applications. The focus of this recipe is not Ruby on Rails, but one aspect of Ruby on Rails namely, convention over configuration (see http://en.wikipedia.org/wiki/ Ruby_on_Rails for more on this). Imagine writing tests and realizing that you use a same set of instructions over and over again. When you convert the code from the repeated code into generic code, you are creating a framework. The framework can be created in one of two ways. The first way is to create infrastructure and wire it together, and the second is to make assumptions about your code. Consider the following JavaScript JsUnit test: var testsToRun = { // Start JavaScript code for test cases here testPlainVanilla : function() { // Some code testManager.success(); }
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// End JavaScript code for test cases }; testManager.setTestCases( testsToRun); The details of what the variables and classes do are not relevant. What is relevant is how they are wired together. The testsToRun variable contains a number of methods that are used to execute particular tests. When each test has completed successfully, the testManager.success method is called. The testsToRun variable is not associated with any other method, data member, or function simply put, testsToRun is hanging like a flag in the wind. Of course, we don t want testsToRun to hang in the wind; we want the tests to be executed. The tests are executed by the testManager variable, and testManager has no knowledge of testsToRun. The challenge is figure out how to make testManager aware of testsToRun and, once it s aware, to execute the contained tests. The wiring of testManager to testsToRun can be a convention or a configuration. In the preceding example, the solution used to make testManager aware of testsToRun is configuration. In classical programming terms, you can think of configuration as being a file on a hard disk with pieces of text that are parsed by an algorithm. That process is a configuration, but it s just one type of configuration. Another type known as programmatic configuration involves the source code telling the classes how everything is wired together. I am not going to cover the advantages and disadvantages of the different configuration types suffice it to say that configuration is used to wire together unknown implementations to create a working system. Configuration is often used because it is an easy way to create a working system. Configuration does not require a deduction algorithm; rather, it needs just an algorithm that can parse a configuration file or a programmer who can wire implementations together. In a nutshell, configuration requires the programmer or administrator to do some of the heavy lifting of figuring out what piece is wired to the other piece. If something doesn t work, then the system can say, Oops, that doesn t work. Try again. Convention can seem to be a more complicated way to create a working system that s more art than science. As an analogy, in the movie I, Robot, the actor Will Smith plays a policeman, Del Spooner, who doesn t like robots. During the robot interrogation scene, Spooner winks at another policeman leaving the questioning room. The robot asks Will what the wink meant, and Spooner explains that the wink is something that a human knows. At a later point in the movie, the robot uses a wink to send a message to Spooner. Spooner is surprised, but he knows what it means and acts appropriately. So how does the wink relate to convention To someone who knows what the wink is, it is a single simple piece of information that has many implications. To someone who doesn t know what the wink is, it is dismissed as irrelevant. A person who dismisses the wink is missing a piece of vital information and could be considered out of the loop of knowledge. The wink represents a complicated piece of information that requires a context to completely understand. One critique of Ruby on Rails is that it s more art than science, and thus not logical, since it uses convention in other words, it s like the wink, and if you don t have the context to understand it, it doesn t make sense. I would like to counter that configuration uses convention, and thus is a convention. In the simplest case, configuration is self-explanatory, but in the more complex case, a configuration file is a convention all on its own. To understand the configuration, you need to understand the convention of the configuration, which begs the question, why use a configuration The
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