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example. Unlike many other languages, such as Perl, PHP, C, or C++, a semicolon is not needed at the end of lines in Ruby (although it won t hurt if you do use one). This can take a little while to get used to at first, but for new programmers it makes Ruby even easier to learn.

Here s a much more complex example: User.find_by_email('me@privacy.net').country = 'Belgium' This code is nowhere near as obvious as the Hello, world! example, but you should still be able to take a good guess at what it does. First, it tells the computer you want to work with a concept called User. Next, it tries to find a user with a specified e-mail address. Last, it changes the user s country data to Belgium. Don t worry about how the data is stored for users at this point; that comes later.

using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { IsolatedStorageFileStream stream = store.OpenFile( System.IO.Path.Combine( currentDir, this.txtFileName.Text), FileMode.OpenOrCreate); StreamWriter sw = new StreamWriter(stream); sw.Write(fileContents); sw.Close(); stream.Close(); } GetStorageData(); }

An entity member name can be arbitrary Unicode text, meaning it can contain spaces or dots or symbols. As such, when the name violates the requirements of M restrictions on identifiers (say, by containing spaces or dots), the name can be escaped with square brackets. For example: { [QC Passed] => true, [Assembly Date] =>System.Date.Today] } ; Developers would normally want to avoid using escaped identifiers, but there may be situations where they may be needed.

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

This is a reasonably advanced and abstract example, but demonstrates a single concept from a potentially complex application where you can deal with different concepts such as users. By the end of this chapter, you ll see how you can create your own real-life concepts in Ruby and operate upon them in a similar way to this example. Your code can be almost as easy to read as English too.

This method is similar to the ShowFile() method. Basically, you get the isolated storage instance, and open the file using the OpenFile() method, passing it the full file path. However, this time, you pass the OpenFile() method FileMode.OpenOrCreate. This way, if the file doesn t exist, the application will create it. You then attach the returned stream to a StreamWriter, and write the contents to the Stream using the StreamWriter s Write() method. After writing the file, you clean up the objects and call the GetStorageData() method, which will cause the newly created file to appear in the files ListBox (in the event a new file was created). At this point, you re ready to test your completed application.

Learning can be a fun activity in its own right, but merely reading about something won t make you an expert at it I ve read a few cookbooks, but this doesn t seem to improve my cooking when I attempt it from time to time The missing ingredient is experimentation and testing, as without these your efforts are academic, at best With this in mind, it s essential to get into the mood of experimenting and testing from day one of using Ruby Throughout the book, I ll ask you to try out different blocks of code and to play with them to see if you get the results you want You ll occasionally surprise yourself, sometimes chase your code into dead ends, and often want to pull out your hair (if you have any, of course!).