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The prospect of managing everything you show, say, and do during every slide in a presentation can seem daunting at rst. Even if you have written a clear and coherent set of headlines, as shown in Figure 6-1, how can you possibly ll all of the empty slides you will create from the story template with graphics, narration, and interaction in a quick and ef cient way And at the same time, how can you seamlessly integrate all of these complex elements during a live presentation The answer lies in a different way of looking at PowerPoint as a visual storytelling tool.

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If you have multiple versions of the same gem(s) installed, gem will ask you which version(s) you want to remove. By default, gems are searched for in the default repository, hosted by RubyForge (http://www.rubyforge.org/) at http://gems.rubyforge.org/. Any gem files uploaded to Ruby projects hosted on the RubyForge site are made available in the default repository, making a RubyForge account a necessity if you want to distribute your libraries to the widest audience possible in an easy fashion. However, you can run your own gems repository on your own Web site or by using the RubyGems server software. This is less common and requires users of your gems to specify your server name at the same time as installing the gem. RubyGems is covered in full in 7 and several RubyGems are documented in 16.

You might wonder why I have chosen such an ugly name as lst for my list. Why not call it list I could do that, but as you might remember, list is a built-in function.2 If I use the name for a list instead, I won t be able to call the function anymore. You can generally find better names for a given application. A name such as lst really doesn t tell you anything. So if your list is a list of prices, for instance, you probably ought to call it something like prices, prices_of_eggs, or pricesOfEggs. It s also important to note that append, like several similar methods, changes the list in place. This means that it does not simply return a new, modified list it modifies the old one directly. This is usually what you want, but it may sometimes cause trouble. I ll return to this discussion when I describe sort later in the chapter.

his appendix provides several reference sections that you ll find useful from time to time while developing applications with Ruby. More specifically, what s in this appendix is limited to direct reference information that you might find useful while otherwise using this book. For a list of external resources, such as Web sites and mailing lists you can query for more detailed or up-to-date information, refer to Appendix C. Over time, it s essential you learn to use Ruby s online references, as they ll be updated in line with how the Ruby language develops. They ll also open your mind to new possibilities and advanced techniques not covered in this book.

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Note This section is not designed to be an exhaustive reference. Only the most useful methods of several key classes are covered. For a complete, easy-to-search reference of the Ruby core classes, refer to http://www.ruby-doc.org/core/.

See Enumerable, a module that s mixed in with Array, for more methods. The following are the most commonly used methods available on Array objects: &: Intersects the contents of one array with another. For example: [1, 2, 3] & [2, 3, 4] == [2, 3]. *: Repeats the elements of an array a certain number of times if an integer is supplied; otherwise, joins the array elements together if a string is supplied. For example: [1, 2, 3] * 2 == [1, 2, 3, 1, 2, 3] and [1, 2, 3] * " " == "1 2 3".