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affordable web hosting solution 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....
affordable web hosting solution 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. 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.
affordable web hosting solution 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. 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.
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