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here later in this chapter. For now, simply recognize the structure of laying down classes and methods, as covered in 2.

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After you add a second puzzle piece to the second Key Point slide, add a similar puzzle piece to the navigation bar through the rest of the Explanation and Detail slides in this section, as shown in Figure 7-17. Then, after you add a third puzzle piece to the third Key Point slide, add three similar puzzle pieces to the navigation bar through the rest of the Explanation and Detail slides in that section. As the audience views the slides in sequence, the navigation bar appears the same, until you reach the slides in the subsequent Key Point section, when they see a new puzzle piece appear to cue them that they are in a new section.

The procedural programmer scoffs at the object-oriented solution. Why all the pointless assignments of data he mocks. That object-oriented code is 90% structure and 10% logic! The boss is impressed by the shortness of the procedural code, but decides to try them out for himself. He quickly spots a big difference:

puts area_of_triangle(6,6) puts perimeter_of_square(5)

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You ve seen how print can be used to print an expression, which is either a string or is automatically converted to one. But you can actually print more than one expression, as long as you separate them with commas: >>> print 'Age:', 42 Age: 42 As you can see, a space character is inserted between each argument.

my_square = Square.new(5) my_triangle = Triangle.new(6, 6, 7.81, 7.81, 7.81) puts my_square.area puts my_square.perimeter puts my_triangle.area puts my_triangle.perimeter

FIGURE 7-17 The second Key Point slide and the Explanation slides and Detail slides with a navigation bar with a second puzzle piece added.

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The boss notices that with the object-oriented code, he can create as many shapes as he wants in a logical way, whereas the procedural code expects him to have a mental note of the shapes he wants to work with He isn t without his concerns, though More lines of code means more time required, he says Is it worth taking the object-oriented route if it means more lines of code, more time, and more hassles The object-oriented developer has heard this complaint before, and immediately springs into action Try dealing with a large number of random shapes, he says The boss isn t entirely up to date with modern development trends, but when he discovers that many new types of shapes can be produced easily by copying and pasting the existing classes with some minor tweaks, he begins to be won over.

Your next job is to sketch the second-most important slides in the presentation the Explanation slides for each scene of Act II. In Slide Sorter view, zoom out to locate the light gray Explanation slides, and then drag each one in order to follow their corresponding Key Point slide to see them together, as shown in Figure 7-18. When you ve nished sketching, you ll drag these slides back to their previous positions. As with the CTA+3 slides, it s important that you see and work with these four slides together as a package just as each Key Point headline summarizes the Explanation headlines to come, each Key Point slide should visually summarize its Explanation slides.

He also realizes that if a shape could be stored as an object referenced by a single variable, and that if each shape class accepted the same methods, the type of shape presented wouldn t matter He could call the perimeter or area method on any shape without worry The procedural code, on the other hand, is just a jumble of different routines, and the developer would be forced to keep track of the different types of shapes to know which procedures to run The Shape class also provides a way to give general functionality to all the different types of shapes if it s necessary in future The boss knows which code to choose! Object-oriented code requires a little more setup, but when it comes to scaling that code to fit real-life requirements, there s no contest! he says.