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website designer website designer class KaraokeSong < Song def initialize(name, artist, duration, lyrics) super(name, artist, duration) @lyrics = lyrics end end The ``< Song'' on the class definition line tells Ruby that a KaraokeSong is a subclass of Song. (Not surprisingly, this means that Song is a superclass of KaraokeSong. People also talk about parent-child relationships, so KaraokeSong's parent would be Song.) For now, don't worry too much about theinitialize method; we'll talk about that super call later. Let's create a KaraokeSong and check that our code worked.

website designer (In the final system, the lyrics will be held in an object that includes the text and timing information. To test out our class, though, we'll just use a string. This is another benefit of untyped languages---we don't have to define everything before we start running code. aSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the.

website designer ..") aSong.to_s » "Song: My Way--Sinatra (225)" Well, it ran, but why doesn't the to_s method show the lyric? The answer has to do with the way Ruby determines which method should be called when you send a message to an object. When Ruby compiles the method invocation aSong.

website designer to_s, it doesn't actually know where to find the method to_s. Instead, it defers the decision until the program is run. At that time, it looks at the class of aSong. If that class implements a method with the same name as the message, that method is run. Otherwise, Ruby looks for a method in the parent class, and then in the grandparent, and so on up the ancestor chain.

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