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cheap jsp web hosting services cheap jsp web hosting services This gives you a chance to write code that sets up your object's state. 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.

cheap jsp web hosting services In Ruby, an instance variable is simply a name preceded by an ``at'' sign (``@''). In our example, the parameter name is assigned to the instance variable @name, artist is assigned to @artist, and duration (the length of the song in seconds) is assigned to @duration. Let's test our spiffy new class. aSong = Song.new("Bicylops", "Fleck", 260) aSong.

cheap jsp web hosting services inspect » "#<Song:0x401b4924 @duration=260, @artist=\"Fleck\", @name=\"Bicylops\">" Well, it seems to work. 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.

cheap jsp web hosting services 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.

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