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In this chapter, we ve focused on making sure Ruby is properly installed and that you can run the irb tool, which you ll be using over the next several chapters. Although Ruby is an easy language to learn and develop with, it s easy to become overwhelmed with the administration of Ruby itself, its installation, and its upgrades. As Ruby is a language constantly in development, it s likely that points covered in this chapter will go out of date, or easier ways to install Ruby will come along for your platform. An important part of being a Ruby developer is being able to use the resources the Ruby community makes available, and being able to find help directly as time goes by. The Ruby community can provide quick help in most cases, and a number of resources to try are available in 5 and Appendix C.

rogramming is both a science and an art. Telling computers what to do with computer programs requires being able to think as both a scientist and an artist. Being an artist is essential for coming up with big ideas and being flexible enough to take unique approaches. Being a scientist is essential to understanding how and why certain methodologies need to be taken into account, and to approach testing and debugging from a logical perspective, rather than an emotional one. Luckily, you don t need to be an artist or a scientist already. As with training the body, programming exercises and thinking about how to solve problems train the mind to make you a better programmer. Anyone can learn to program. The only things that can stand in the way are a lack of commitment or confusing programming languages. Ruby is one of the easiest programming languages to learn, so that leaves commitment. Programming should be fun, even joyful, and if you re enjoying yourself, commitment comes naturally. By the time you reach the end of this chapter, I hope you can get a taste of the fun that lies ahead with the knowledge of a powerful yet deceptively simple programming language, and begin to feel excited about a future of programming nirvana!

n Note This chapter does not follow an instructional format as the subsequent chapters do. Instead I ll

{ this.txtFileName.Text = this.lstFileListing.SelectedItem.ToString(); using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { string filePath = System.IO.Path.Combine( currentDir, this.lstFileListing.SelectedItem.ToString()); IsolatedStorageFileStream stream = store.OpenFile(filePath, FileMode.Open); StreamReader sr = new StreamReader(stream); this.txtContents.Text = sr.ReadToEnd(); sr.Close(); } } }

just go from concept to concept quickly to give you a feel for Ruby as a language before getting down to the details later.

In 1, you focused on installing Ruby so that your computer can understand the language. At the end of the chapter, you loaded a program called irb. Microsoft Windows users ran an application called fxri. fxri and irb provide similar functions, so when I refer to irb, as it s officially known, be aware that you can use fxri instead if you re using Microsoft Windows.

Like the collection type, the entity is an intrinsic type. It is a set of zero or more named values, or fields. The Car type I defined earlier (refer to Figure 5-3) is an example of an entity type, often called simply an entity. Any field of an entity can be accessed by the name of the field. An entity can have an identity, which makes it distinct from all other instances of the type, as shown in Figure 5-3. Any or all fields of an entity can be assigned default values when the entity is initialized, and the values of any field can be constrained by an expression, just as I constrained the year of manufacture in the Car type in Figure 5-3.

Ch apt er 2 n p rOG r a MMING == J OY: a W h I S t Le -S t O p t O U r O F r U B Y a N D O B Je C t O r I e N t a t I O N