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The word design in the context of a web application can mean many things Its most popular usage probably refers to the visual and user interface design of a web site This aspect is crucial because, let s face it, the visitor is often more impressed with how a site looks and how easy it is to use than about which technologies and techniques are used behind the scenes or what operating system the web server is running If the site is slow, hard to use, or easy to forget, it just doesn t matter what rocket science was used to create it Unfortunately, this truth makes many inexperienced programmers underestimate the importance of the way the invisible part of the site is implemented the code, the database, and so on The visual part of a site gets visitors interested to begin with, but its functionality makes them come back.

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Figure 10-1. An example of polymorphic command use with different objects Although the three geometric shapes in Figure 10-1 are different objects, using the same command, you can communicate what you want each object to do, and the object knows how to do it. The polymorphic use of commands or messages reduces the use of synonyms in a programming language. If you re a writer, synonyms are wonderful things. They allow you to use words that have similar meanings but sound different, so that your resulting prose can have a somewhat rhythmic cadence. It can sound beautiful. If you re a programmer, synonyms are awful things. They cause ambiguity because you can t know from the sound of the synonym if it means something similar (LIKE) or if it means exactly the same thing (=). And in programming, ambiguity is a really bad thing. Furthermore, synonyms expand the size of a language and make it harder to learn and use. The harder the language is to use, the more defects will be created when using it, and that too is bad.

Note In a URL, each space is replaced with %20, so each space adds three characters to the length of the URL. URLs are limited to 255 characters. If there are spaces in site names, folder names, and library names, you can easily exceed this limit when you save the HTML file on your SharePoint site.

A web site can sometimes be implemented very quickly based on certain initial requirements, but if not properly architected, it can become difficult, if not impossible, to change For any project of any size, some preparation must be done before starting to code Still, no matter how much preparation and design work is done, the unexpected does happen, and hidden catches, new requirements, and changing rules always seem to work against deadlines Even without these unexpected factors, site designers are often asked to change or add new functionality many times after the project is finished and deployed This will also be the case for HatShop, which will be implemented in three separate stages, as discussed in 1 You will learn how to create the web site so that the site (or you) will not fall apart when functionality is extended or updates are made.

Let s go back to Figure 10-1 for a second. I could have named the command to draw each geometric shape in the figure draw_square(), draw_triangle(), and draw_circle(). That s the procedural programming paradigm. But by doing so, I would have made the programming language three times larger than when I simply used the same command, draw(), in the context of the object to which it belongs. Even if you re not using an object-oriented language, you can still use an object-oriented approach by employing modularity and polymorphism. Employing modularity means abstracting large program units into smaller components that can then be reused and assembled to accomplish a larger purpose. Employing polymorphism means abstracting out a set of commands that communicate the same action; however, the action taken will be appropriate for the object executing the command. And that s what I m going to cover in this chapter, by doing the following: Show you a list of polymorphic commands that I have used repeatedly, project after project, always with the same meaning and to take the same action, but an action appropriate to each object. Tell you a handful of stories, or fairy tales, in which I use each polymorphic command, so you ll have some real-world examples to draw from when you employ polymorphism in your next project. Leave you with some advice about what you should do next. I ll get you jump-started with a list of time-tempered polymorphic commands.

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