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ssh2 host access 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.new("My Way", "Sinatra", 225, "And now, the.
ssh2 host access ..") aSong.to_s » "Song: My Way--Sinatra (225) [And now, the..
ssh2 host access .]" 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. This means that all objects haveObject as an ancestor, and that Object's instance methods are available to every object in Ruby. Back on page 18 we said that to_s is available to all objects.
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