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In this chapter we looked at developing a simple chatterbot, and developed a library along the way, produced tests for the library, worked with storing our bot s vocabulary in an external file, and looked at a number of ways to extend our project with databases or by hooking it up to a Web site. This chapter marks the end of the second part of this book, and you should now have enough Ruby knowledge to pass as a solid, intermediate Ruby developer. You should be able to understand the majority of Ruby documentation available online and be able to use Ruby productively either professionally or for fun. Part 3 of this book digs a little deeper into Ruby s libraries and frameworks, from Ruby on Rails and the Web, to general networking and library use. 16, which looks at a plethora of different Ruby libraries and how to use them, will be particularly useful to refer to as you develop your own programs, so that you don t reinvent the wheel too often!

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covered in this part of the book is not essential for developing general Ruby applications, but as the Internet and the Web are becoming rapidly more important in the scope of modern software development, you re sure to find these chapters useful. This part of the book concludes with a reference-style chapter that covers a swathe of Ruby libraries and the features they offer.

take a look at Python Enhancement Proposal number 245 (http://www.python.org/peps/ pep-0245.html).

Page view, shown in Figure 2-12. As described earlier, Notes Page view lets you see the on-screen slide above, along with an off-screen notes area that the audience does not see. The second trick of BBP is to always work in Notes Page view after Slide Sorter view, which you ll do starting in 6. There are two speci c reasons to do that, as you ll see next.

n this chapter we re going to look at the Ruby on Rails framework, a cutting-edge Web application development framework. We ll walk through developing a basic Rails application and getting it running with a database, before looking at a few more-advanced Web development topics. Although this book is a Ruby book, rather than a Rails (as Ruby on Rails is known in its shortened form) book, Rails has become such an important part of the Ruby world that it demands attention even in a beginner s guide such as this. However, Apress does have a selection of books specifically about Ruby on Rails and Web development available, if you wish to progress further down this line of development.

Before you can begin to develop Web applications using Rails, it s essential first to know what it is and why it s used, as well as how to get it running, as its installation process is more involved than that of other Ruby libraries.

The next research reality, the concept of dual channels, states that people receive and process new visual and verbal information in not one, but two separate but related channels. Allan Paivio described his theory of dual coding in the 1970s, and during the same decade, Alan Baddeley and Graham Hitch described a similar two-channel structure in working memory. Today, the concept has become a widely accepted standard among researchers. In the dual-channels model, the images someone sees are processed through a visual channel, the domain of images including photographs, illustrations, charts, and graphs, as illustrated conceptually in Figure 2-13 (top). What a speaker narrates is processed through the verbal channel (bottom), which is the domain of language.

Ruby on Rails is an open source Web application development framework. It makes the development of Web applications simple. For some of the nontechnical history behind Rails, including the motivation for its development, refer to 5. The goal of Rails is to make it possible to develop Web applications in an easy, straightforward manner, and with as few lines of code as necessary. By default, Rails makes a lot of assumptions and has a default configuration that works for most Web applications. Naturally, it s easy to override any defaults, but they are designed to keep initial application development simple.

Usually, you simply require that objects conform to a certain interface (in other words, implement certain methods), but if you want to, you can be quite flexible in your demands.