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CHAPTER 4 DEVELOPING A BASIC RUBY APPLICATION
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At this point you can simply type or paste Ruby code and use the File Save menu option to save your text to a location on your drive. It would probably be good to create a folder called ruby within your home folder (the folder on the left that has your username in it) and save your initial Ruby source code there, as this is what the instructions assume in the next section.
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Linux distributions often come with varying text editors, but there will be at least one available. If you re working entirely from the shell or terminal, you might be familiar with vi, Emacs, pico, or nano, and all of these are suitable for editing Ruby source code. If you re using Linux with a graphical interface, you might have Kate (KDE Advanced Text Editor) and/or gedit (GNOME Editor) available. All the preceding are great text and source code editors. You could also download and install FreeRIDE, a cross-platform source code editor that s specifically designed for Ruby developers. It allows you to run your code with a single click directly from the editor (if you re using the X graphical user interface), and colors in your code in a way that reflects its syntax, which makes it easier to read. You can learn more about FreeRIDE at http://freeride.rubyforge.org/. At this stage it would be a good idea to create a folder in your home directory called ruby, so that you can save your Ruby code there and have it in an easily remembered place.
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CHAPTER 4 DEVELOPING A BASIC RUBY APPLICATION
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The Test Source Code File
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Once you ve got an environment where you can edit and save text files, enter the following code:
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x = 2 print "This application is running okay if 2 + 2 = #{x + x}"
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Note If this code looks like nonsense to you, you ve skipped too many chapters. Head back to 3!
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This chapter requires full knowledge of everything covered in 3.
Save the code with a filename of a.rb in a folder or directory of your choice. It s advisable that you create a folder called ruby located somewhere that s easy to find. On Windows this might be directly off of your C drive, and on OS X or Linux this could be a folder located in your home directory.
Note RB is the de facto standard file extension for Ruby files, much like PHP is standard for PHP, TXT is
common for text files, and JPG is standard for JPEG images.
Now you re ready to run the code.
Running Your Source Code
Once you ve created the basic Ruby source code file, a.rb, you need to get Ruby to execute it. As always, the process by which to do this varies by operating system. Read the particular following section that matches your operating system. If your operating system isn t listed, the OS X and Linux instructions are most likely to match those for your platform. Whenever this book asks you to run your program, this is what you ll be doing each time.
Note Even though you re going to be developing an application in this chapter, there are still times when
you ll want to use irb to follow along with the tests or basic theory work throughout the chapter. Use your judgment to jump between these two methods of development. irb is extremely useful for testing small concepts and short blocks of code without the overhead of jumping back and forth between a text editor and the Ruby interpreter.
CHAPTER 4 DEVELOPING A BASIC RUBY APPLICATION
Windows
If you re using the SciTE or FreeRIDE programs that came with the Ruby installer for Windows, you can run Ruby programs directly from them (see Figure 4-2). In both programs you can press the F5 function key to run your Ruby code. Alternatively you can use the menus ( Tools Go in SciTe, and Run Run in FreeRIDE). However, before you do this, it s important to make sure you have saved your Ruby code. If not, the results might be unpredictable (running old code from a prior save, for example) or you ll be prompted to save your work. If running the a.rb code gives a satisfactory output in the output view pane (to the right on SciTE, and at the bottom on FreeRIDE), you re ready to move on to the section, Our Application: A Text Analyzer.
Figure 4-2. Running code in FreeRIDE on Microsoft Windows (notice the output in the bottom pane)
Alternatively, you might prefer to run Ruby from the command prompt. To do this, load up the command prompt ( Start menu Run Type cmd and click OK ), navigate to the folder containing a.rb using the cd command, and then type ruby a.rb.
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