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p to this point we ve focused on covering the basics of the Ruby language and looking at how it works at the ground level. In this chapter we ll move into the world of real software development and develop a full, though basic, Ruby application with a basic set of features. Once we ve developed and tested the basic application, we ll look at different ways to extend it to become more useful. On our way we ll cover some new facets of development that haven t been mentioned so far in this book. First, we re going to look at the basics of source code organization before moving on to actual programming.

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Not exactly what we wanted, is it As mentioned briefly in 1, octal numbers are written with an initial zero. It is impossible to write decimal numbers like that.

So far in this book we ve focused on using the irb immediate Ruby prompt to learn about the language. However, for developing anything you wish to reuse over and over, it s essential to store the source code in a file that can be stored on disk (or sent over the Internet, kept on CD, and so forth). The mechanism by which you create and manipulate source code files on your system varies by operating system and personal preference. On Windows, you might be familiar with the included Notepad software for creating and editing text files. At a Linux prompt, you might be using vi, Emacs, or pico/nano. Mac users have TextEdit at their disposal. Whatever you use, you need to be able to create new files and save them as plain text so that Ruby can use them properly. In the next few sections, you re going to look at some specific tools available on each platform that tie in well with Ruby development.

What was notable about Mark s PowerPoint slide, shown on its own in Figure 1-4, was not so much what was on it, but rather what was not on it. You would probably expect the slides of a PowerPoint presentation to be lled with bullet points, but here the jurors saw only the visual power of a single, simple photograph. Such full-screen images are rare in PowerPoint presentations, but this image t in perfectly with what Mark would do next.

The first step to developing a Ruby application is to get familiar with your text editor. Here s some guidance for each major platform. If you re already familiar with text editors and how they relate to writing and saving source code, skip down to the section entitled The Test Source Code File.

If you followed the instructions in 1 for downloading and installing Ruby, you ll have two text editors called SciTE and FreeRIDE in the Ruby program group in your Start menu. SciTE is a generic source code editing tool, whereas FreeRIDE is a Rubyspecific source code editor, written in Ruby itself. SciTE is a little faster, but FreeRIDE is more than fast enough for general development work and has better integration with Ruby. Once you load an editor, you re presented with a blank document where you can begin to type Ruby source code (on FreeRIDE you need to use the File menu to create a new document). By using the File menu, you can also save your source code to the hard drive, as you ll do in the next section. With FreeRIDE, it s also possible to organize multiple files into a single project.

Mac OS X has a number of text editors available. TextMate by MacroMates (http://www. macromates.com/), as shown in Figure 4-1, tends to be the most respected in the Ruby community, but it s not free and costs approximately $50. Xcode, included with the OS X Development Tools, is also a viable alternative, but requires that you know how to install and use the development tools (these come on your OS X installation disc). Xcode can also feel quite slow, depending on the specification of your Mac. Included with OS X for free, however, is TextEdit. You can load TextEdit by going to your Applications folder and double-clicking the TextEdit icon. In its default mode, TextEdit isn t a plain text editor, but if you go to the Format menu and select Make Plain Text, you ll be taken to a plain text editing mode that s suitable for editing Ruby source code.

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The lesson is this: Telephone numbers (and other numbers that may contain leading zeros) should be represented as strings of digits not integers.