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In this chapter we ve focused on making sure Ruby is properly installed and that you can run the irb tool that you ll be using over the next several chapters. Although Ruby is an easy language to learn and develop with, it s easy to become overwhelmed with the administration of Ruby itself, its installation, and its upgrades. As Ruby is a language constantly in development, it s likely that points covered in this chapter will go out of date, or easier ways to install Ruby might come along for your platform. An important part of being a Ruby developer is being able to use the resources the Ruby community makes available, and being able to find help directly as time goes by. The Ruby community can provide quick help in most cases, and a number of resources to try are available in 5 and Appendix C.

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FIGURE 7-15 Sketches showing how to carry over the split-screen approach from the Point A and Point B slides to the Call to Action slide.

rogramming is both a science and an art. Telling computers what to do with computer programs requires being able to think as both a scientist and an artist. Being an artist is essential for coming up with big ideas and being flexible enough to take unique approaches. Being a scientist is essential to understanding how and why certain methodologies need to be taken into account, and to approach testing and debugging from a logical perspective, rather than an emotional one. Luckily, you don t need to be an artist or a scientist already. As with training the body, doing programming exercises and thinking about how to solve problems trains the mind to make you a better programmer. Anyone can learn to program. The only things that can stand in the way are a lack of commitment or confusing programming languages. Ruby is one of the easiest programming languages to learn, so that leaves commitment. Programming should be fun, even joyful, and if you re enjoying yourself, commitment comes naturally. By the time you reach the end of this chapter, I hope you can get a taste of the joy that lies ahead with the knowledge of a powerful, yet deceptively simple programming language, and begin to feel excited about a future of programming nirvana!

Note This chapter does not follow an instructional format as the following chapters do. Instead I ll just go

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Now that you ve explored the CTA+3 sketches, in Slide Sorter view, drag the Key Point slides back to where they belong in sequence. Review the storyboard to see how these slides guide the working memory of your audience across the levels of the storyboard rst with the rst Key Point slide, then with the Explanation slides, and then with the Detail slides, with each level of the slide design carrying the visual story forward from the preceding one. Next you ll explore a visual way to link the rest of the slides to come by sketching a navigation bar.

from concept to concept quickly to give you a feel for Ruby as a language before getting down to the details later.

In 1, you focused on installing Ruby so that your computer can understand the language. At the end of the chapter, you loaded a program called irb. Microsoft Windows users ran an application called fxri. fxri and irb provide similar functions, so when I refer to irb, as it s officially known, be aware that you can use fxri instead if you re using Microsoft Windows.

You can tie together the slides of the presentation even more tightly with a visual navigation bar at the bottom of the screen. In the conventional PowerPoint approach, the space at the bottom of a screen usually contains the presenting organization s logo. You can certainly sketch your own organization s logo to illustrate the point of any single slide in the storyboard if the headline calls for that, or you can sketch the logo on the Introductory slide, as described earlier. But you would not sketch your logo on other slides because doing so adds extraneous visual information for working memory to process, which impairs learning, as described in 2. (Besides, putting your logo on every slide sends the wrong visual message that every slide is all about you, when it is really all about the audience.)

irb stands for Interactive Ruby. Interactive means that as soon as you type something, your computer will immediately attempt to process it. So if you typed in the print Hello, world! 10 times source code from the previous chapter into irb and pressed Enter, you d immediately see the results. Sometimes this sort of environment is called an immediate or interactive environment.