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You might notice text in source code prefixed with # symbols. These are comments and are generally used in programs for the benefit of the original developer(s), along with anyone else who might need to read the source code. They re particularly useful for making notes to remind you of why you took a particular course of action that you re likely to forget in the future. You can place comments in any Ruby source code file on their own lines, or even at the end of a line of code. Here are some valid examples of commenting in Ruby: puts 2+2 = #{2+2} # Adds 2+2 to make 4 # A comment on a line by itself As long as a comment is on a line by itself, or is the last thing on a line, it s fine. Comment liberally, and your code will be easier to understand.

FontFamily: Verdana FontSize: 14 FontWeight: Bold Foreground: #FF0008FF Background: #FFF9F57D VerticalAlignment: Top Margin: 5,5,5,5

Summary

In this chapter, you developed a complete, basic application that realized a set of requirements and desired features. You then extended it with some nonessential but useful elaborations. Ruby makes developing quick applications a snap. The application you ve developed in this chapter has demonstrated that if you have a lot of text to process or a number of calculations to do, and you re dreading doing the work manually, Ruby can take the strain. To keep things simple, we didn t use any methods or flow control in our application. It simply went through a process step by step to give a set of results. This is the simplest form of useful program. More complex programs will undoubtedly involve flow control and methods, and we ll be covering those in more depth in the following chapters. 4 marks the end of the practical programming exercises in the first part of this book. Next, in 5, you ll take a look at the history of Ruby, Ruby s community of developers, and the historical reasons behind certain features in Ruby. You ll also learn how to get help from and become part of the Ruby community. Code makes up only half the journey to becoming a great programmer!

can contain any number of syntax rules, but the required Main rule is the top-level rule to which all input statements or documents must conform in order to be valid within the grammar definition of the language. So far, you ve set up a language that will accept only the statement "Pastrami on Rye." If this is your system, then as long as a customer orders only pastrami on rye, you re good. Anything else will generate an error. Norm has made sure that Lola s sample order includes a period at the end, and he s included the period as part of his Main syntax rule definition. In the present context, this isn t important because the system will be well defined, even if it is nonsense to a human reader, as long as the input DSL sequence of characters (string) matches the string expected by the grammar definition. But later on, Norm expects to use a period to tell the system it has reached the end of a SandwichOrders statement. In the right pane of Figure 3-7, you see that the input DSL and the simple-minded DSL Grammar definition have generated an M language program (termed an M Graph).

s with other programming languages, Ruby has its own culture and ecosystem. Ruby s ecosystem is made up of thousands of developers, maintainers, documenters, bloggers, companies, and those who help sponsor or fund the development of the language. Some programmers who are new to a language assume that learning about a language s history and community is pointless, but the most successful developers quickly learn about the ecosystem and get involved in it. The motivations behind a language s development can provide significant clues about the best approaches to take when solving problems, and understanding the vocabulary of other developers greatly helps when it comes to looking for help and advice. This chapter takes a break from the code-focused tutorials to bring you up to speed with how the Ruby world works, the motivations behind the language, and the best ways to find help and get involved with the community. If you re new to software development, this chapter will also explain some of the many terms and phrases used by developers relating to software development. You ll also take a quick look at Ruby s history, Ruby s creator, the processes and terminology that Ruby developers use that make them reasonably unique, and the technologies that have taken Ruby from being relatively unknown to being an important first-class programming language.