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A common problem in conventional PowerPoint presentations occurs when a diagram or chart is too complex to be understood or at least not understood all at once on a single slide. If your audience is new to the information in any diagram or chart, you can easily overwhelm the limited capacity of the working memory of your audience and impair learning. You address the underlying root of this problem by breaking down Key Point headlines in the story template into smaller pieces as you write the Explanation and Detail headlines, which later become the foundation for individual slides that appear on screen for less than a minute while you narrate each slide. Because you have used this approach of breaking down complicated ideas into smaller pieces, instead of explaining a great deal of information in a diagram on a single slide for many minutes, you can explain the same information in smaller pieces for less than a minute each, across a series of slides. This ensures that you present new information

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In Ruby, this sort of basic variable is called a local variable. It can only be used in the same place as where it is defined. If you jump to using an object s methods or a separate method of your own, the variable x doesn t come with you. It s considered to be local in scope. That is, it s only present within the local area of code. Here s an example that demonstrates this:

This example defines x to equal 10, and then jumps to a local method called basic_method. If you ran this code through irb, you would get an error like this:


because that would introduce a space before the comma. One solution would be the following:

NameError: undefined local variable or method `x' for main:Object from (irb):2:in `basic_method'

What s happening is that when you jump to basic_method, you re no longer in the same scope as the variable x that you created. Because x is a local variable, it only exists where it was defined. To avoid this problem, it s important to remember to use only local variables where they re being directly used, as this is what they re really for. Here s an example where you have two local variables with the same name but in different scopes:

evenly over the sequence of slides of any explanation, showing and saying only the correct information at the correct time to ensure that you do not overload or split the attention of the working memory of your audience between what you are saying and showing at any moment. After you have broken up an idea into smaller pieces across a set of Explanation headlines in the story template, building a diagram across the corresponding series of Explanation slides is an effective way to illustrate your ideas if you are describing a process or how the parts of something relate to the whole. For example, you might sketch on your Key Point slide a simple diagram with three numbered boxes to illustrate the three-part strategy, as shown on the upper-left slide in Figure 7-19. Carry through this simple structure by sketching three similar boxes on the third Explanation slide. Sketch number labels below the boxes, and then sketch an eye icon in the rst box to illustrate we closely watch and listen, a clock icon to illustrate we meet with you, and a row of small numbers from a spreadsheet to illustrate we crunch the numbers, as shown on the lower-right slide in Figure 7-19. Sketch an arrow to show the motion in the diagram from left to right. Next sketch the same rst two boxes on the second Explanation slide (lower left) and only the rst box on the rst Explanation slide (upper right).

50 10

This demonstrates that local variables live entirely in their original scope. You set x to 10 in the main code, and set x to 50 inside the method, but x is still 10 when you return to the original scope. The x variable inside basic_method is not the same x variable that s outside of the method. They re separate variables, distinct within their own scopes.

If you add a comma at the end, your next print statement will continue printing on the same line. For example, the statements print 'Hello,', print 'world!' print out Hello, world!

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