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low cost private jsp mysql It will then append to this the lyric information and return the result. 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.
low cost private jsp mysql def to_s super + " [#{@lyrics}]" end end aSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the...") aSong.
low cost private jsp mysql to_s » "Song: My Way--Sinatra (225) [And now, the...]" We explicitly told Ruby that KaraokeSong was a subclass of Song, but we didn't specify a parent class for Song itself. If you don't specify a parent when defining a class, Ruby supplies class Object as a default.
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