website design template

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website design template website design template It saves us having to repeat redundant stuff in each example. Obviously, though, if you were creating this code from scratch, you'd probably just throw all the methods into a single class definition. Enough detail! Let's get back to adding a to_s method to our Song class. class Song def to_s "Song: #{@name}--#{@artist} (#{@duration})" end end aSong = Song.new("Bicylops", "Fleck", 260) aSong.

website design template to_s » "Song: Bicylops--Fleck (260)" Excellent, we're making progress. However, we've slipped in something subtle. We said that Ruby supports to_s for all objects, but we didn't say how. The answer has to do with inheritance, subclassing, and how Ruby determines what method to run when you send a message to an object. This is a subject for a new section, so.

website design template ... Inheritance and Messages Inheritance allows you to create a class that is a refinement or specialization of another class. For example, our jukebox has the concept of songs, which we encapsulate in class Song.

website design template Then marketing comes along and tells us that we need to provide karaoke support. A karaoke song is just like any other (there's no vocal on it, but that doesn't concern us). However, it also has an associated set of lyrics, along with timing information. When our jukebox plays a karaoke song, the lyrics should flow across the screen on the front of the jukebox in time with the music. An approach to this problem is to define a new class, KaraokeSong, which is just like Song, but with a lyric track.

website design template

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website design template