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There s a reason houses aren t made in one big piece, but one wall, roof, floor, and staircase at a time That way, relocating a window does not affect other walls or other structural elements, and the worst thing that such an adjustment can do is cause you to have to rebuild a single wall Houses are built of separate components, and computer programs generally should be as well The easiest way to componentize a program is to organize it into several functions It is best if these functions fall into separate areas of responsibility, if at all possible, so that two or more functions are not working at cross-purposes or doing the same task For example, the following code snippet shows how using functions improve program organization and readability:
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function groceries () { var grocerylist = get_grocery_list(); drive_to_store(); for (var item in grocerylist) { get_item(item): } pay_cashier(); drive_home(); put_food_away(); return; }
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We could have alternatively used an unstructured program that attempted to do all those tasks in order But that program would have been harder to read, test, and make changes to
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To test a function, we only need to make sure that it performs the tasks and returns the value that is expected of it Most functions rely on the way the rest of the program is structured, so you can never be 100 percent sure that nothing will go wrong Because functions are easier to test, you will find that procedural programming offers a higher sense of reliability than unstructured programming does
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The other way to componentize your code would be to break it into a number of classes and objects Classes allow you to separate all related functions and variables into a single module This allows you to create classes that can be easily reused in other applications For instance, you can create a class that represents an item in the user s online shopping cart Since this item code is generic, the exact same code can be reused in other applications that need access to an item, say, an inventory program
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class Item { var SKU : String; var productName : String; var size : String; var color : String; var retailPrice : Number; var wholesalePrice : Number; function Item(inSKU : String, inName : String, inSize : String, inColor : String, inPrice1 : Number, inPrice2 : Number) { thisSKU = inSKU; thisproductName = inName; thissize = inSize; thiscolor = inColor; thisretailPrice = inPrice1; thiswholesalePrice = inPrice2; } // More methods would follow }
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Classes and objects are much easier to test as well You would only need to check once to make sure the object behaves the way it is expected to As long as there are no code changes in the class, the object can be considered completely tested
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CHAPTER 14: Make Your Program Errorproof
Test Your JavaScript Code Thoroughly
The final key to ensuring that your program is immune from errors is to perform thorough testing on it Testing involves running the program many different times under many different scenarios to make sure it operates as expected For short scripts, testing does not have to be complicated For instance, testing mouse rollover effects may just entail rolling the mouse across an image several times to make sure that it toggles as expected For more complicated scripts, such as those involving DHTML or interframe communication, more rigorous testing may be required
Create a Testing Harness
A testing harness is a program whose job it is to help test other programs In JavaScript programming, a testing harness generally takes the form of a custom web page that exposes buttons and form fields used for testing the behind-the-scenes scripts Figure 14-2 shows an example of a good testing harness The web page allows a developer or tester to manually trigger certain events or to force-feed certain values to functions embedded on the page
FIGURE 14-2
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