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affordable web hosting solution for business Suddenly,KaraokeSong would start reporting ridiculous values. The idea of a karaoke version of ``My Way'' that lasts for 3750 minutes is just too frightening to consider. We get around this problem by having each class handle its own internal state. When KaraokeSong#to_s is called, we'll have it call its parent's to_s method to get the song details. It will then append to this the lyric information and return the result.
affordable web hosting solution for business The trick here is the Ruby keyword ``super''. When you invoke super with no arguments, Ruby sends a message to the current object's parent, asking it to invoke a method of the same name as the current method, and passing it the parameters that were passed to the current method. Now we can implement our new and improved to_s. class KaraokeSong < Song # Format ourselves as a string by appending # our lyrics to our parent's #to_s value. def to_s super + " [#{@lyrics}]" end end aSong = KaraokeSong.
affordable web hosting solution for business new("My Way", "Sinatra", 225, "And now, the...") aSong.to_s » "Song: My Way--Sinatra (225) [And now, the.
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