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ssh2 client ssh2 client Let's try it on our song. aSong = Song.new("Bicylops", "Fleck", 260) aSong.to_s "#<Song:0x401b499c>" That wasn't too useful---it just reported the object id. So, let's override to_s in our class.

ssh2 client As we do this, we should also take a moment to talk about how we're showing the class definitions in this book. In Ruby, classes are never closed: you can always add methods to an existing class. This applies to the classes you write as well as the standard, built-in classes. All you have to do is open up a class definition for an existing class, and the new contents you specify will be added to whatever's there. This is great for our purposes.

ssh2 client As we go through this chapter, adding features to our classes, we'll show just the class definitions for the new methods; the old ones will still be there. It saves us having to repeat redundant stuff in each example. Obviously, though, if you were creating this code from scratch, you'd probably just throw all the methods into a single class definition. Enough detail! Let's get back to adding a to_s method to our Song class. class Song   def to_s     "Song: #{@name}--#{@artist} (#{@duration})"   end end aSong = Song.

ssh2 client new("Bicylops", "Fleck", 260) aSong.to_s "Song: Bicylops--Fleck (260)" Excellent, we're making progress. However, we've slipped in something subtle. We said that Ruby supports to_s for all objects, but we didn't say how. The answer has to do with inheritance, subclassing, and how Ruby determines what method to run when you send a message to an object.

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