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As the last file loaded, it turns out to be the latter version of random, and a random letter should appear onscreen. Unfortunately, however, it means your other random method has been lost. This situation is known as a name conflict, and it can happen in even more gruesome situations than the simplistic example shown in the preceding code. For example, class names can clash similarly, and you could end up with two classes mixed into one by accident. If a class called Song is defined in one external file, and then defined in a second external file, the class Song available in your program will be a dirty mix of the two. Sometimes this might be the intended behavior, but in other cases this can cause significant problems. Modules help to solve these conflicts by providing namespaces that can contain any number of classes, methods, and constants, and allow you to address them directly. For example:

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As you re thinking about what other sketches to include on your Detail slides, review the optional Act II headings in the section Tip 3: Tailor Your Act II Column Headings to Your Profession, in 5. For example, if you re a market researcher, your Detail slides will probably include sketches of screen captures that illustrate your analytical tools, brief video clips from focus groups, and of course charts, graphs, and diagrams. If you re a lawyer, your Detail slides will contain sketches of your speci c evidence, such as screen captures of your hot documents, photographs, short clips from video depositions, and scienti c drawings. If you re selling a software product, your Detail slides will probably include sketches of the various sections of your product demonstration.

module LetterStuff def LetterStuff.random (rand(26) + 65).chr end end puts NumberStuff.random puts LetterStuff.random

Perhaps the most basic operators used in conditions are the comparison operators. They are used (surprise, surprise) to compare things. The comparison operators are summed up in Table 5-1.

184783 X

7

Note Due to the randomness introduced by using rand, the preceding results will vary every time you

In this demonstration it s clear which version of random you re trying to use in the two last lines. The modules defined in the preceding code look a little like classes, except they re defined with the word module instead of class. However, in reality, you cannot define instances of a module, as they re not actually classes, nor can they inherit from anything. Modules simply provide ways to organize methods, classes, and constants into separate namespaces. A more complex example could involve demonstrating two classes with the same name, but in different modules:

It might take some time to learn the new skills of sketching your slides across frames and across levels. If you re having a tough time guring out how to sketch diagrams, charts, and other Explanation or Detail slide elements, you might nd it helpful to leave PowerPoint for a few minutes and review a printed copy of your story template. Read through the headlines from top to bottom in the Explanation column, and sketch directly over the column how you want to illustrate each Explanation slide for example, with a diagram, as shown in Figure 7-26. Then read through the headlines in the Detail column, and sketch how to illustrate each Detail slide for example, with a demonstration, a video clip, or a chart. Here it might be easier to see that the sketch of each Explanation slide should be a summary and introduction of the adjacent Detail headlines to the right.

x equals y. x is less than y. x is greater than y. x is greater than or equal to y. x is less than or equal to y. x is not equal to y. x and y are the same object. x and y are different objects. x is a member of the container (e.g., sequence) y. x is not a member of the container (e.g., sequence) y.

module ToolBox class Ruler attr_accessor :length end end module Country class Ruler attr_accessor :name end end

a = ToolBox::Ruler.new a.length = 50 b = Country::Ruler.new b.name = "Ghengis Khan from Moskau"

Sketching directly on the story template connects you back with the verbal story you wrote and helps you see what you re trying to accomplish from a different perspective. To sketch directly on the story template while you work with a team, place a screen capture of the story template on a PowerPoint slide and mark it up while it is displayed on a screen in the room.