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apache jsp apache jsp So it seems like a good idea to start off by setting up a Ruby class that represents things that are songs. We know that a real song has a name, an artist, and a duration, so we'll want to make sure that the song objects in our program do, too. We'll start off by creating a basic class [As we mentioned on page 9, class names start with an uppercase letter, while method names start with a lowercase letter.] which contains just a single method, . class Song   def initialize(name, artist, duration)     @name     = name     @artist   = artist     @duration = duration   end end is a special method in Ruby programs.

apache jsp When you call object, Ruby creates an uninitialized object and then calls that object's method, passing in any parameters that were passed to . This gives you a chance to write code that sets up your object's state. For class method takes three parameters. These parameters act just like local variables within the method, so they follow the local variable naming convention of starting with a lowercase letter. Each object represents its own song, so we need each of our objects to carry around its own song name, artist, and duration.

apache jsp This means we need to store these values as within the object. In Ruby, an instance variable is simply a name preceded by an ``at'' sign (``@''). In our example, the parameter , (the length of the song in seconds) is assigned to . Let's test our spiffy new class. Well, it seems to work.

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apache jsp