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website design template Along the way, we'll be implementing part of our next billion-dollar product, the Internet Enabled Jazz and Blue Grass jukebox. After months of work, our highly paid Research and Development folks have determined that our jukebox needs songs. 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 Song,[As we mentioned on page 9, class names start with an uppercase letter, while method names start with a lowercase letter.

website design template ] which contains just a single method, initialize. class Song   def initialize(name, artist, duration)     @name     = name    @artist   = artist     @duration = duration   end end initialize is a special method in Ruby programs. When you call Song.new to create a new Song object, Ruby creates an uninitialized object and then calls that object's initializemethod, passing in any parameters that were passed to new. This gives you a chance to write code that sets up your object's state.

website design template For class Song, the initialize 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 Song objects to carry around its own song name, artist, and duration. This means we need to store these values as instance variableswithin the object. In Ruby, an instance variable is simply a name preceded by an ``at'' sign (``@'').

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