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website design template By default, the inspect message, which can be sent to any object, dumps out the object's id and instance variables. It looks as though we have them set up correctly. Our experience tells us that during development we'll be printing out the contents of a Song object many times, and inspect's default formatting leaves something to be desired. Fortunately, Ruby has a standard message, to_s, which it sends to any object it wants to render as a string. Let's try it on our song.
website design template 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. As we do this, we should also take a moment to talk about how we're showing the class definitions in this book.
website design template 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. 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.
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