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private jsp servlets ]" We're correctly displaying the value of the @lyrics instance variable. To do this, the subclass directly accesses the instance variables of its ancestors. So why is this a bad way to implement to_s? The answer has to do with good programming style (and something called decoupling). By poking around in our parent's internal state, we're tying ourselves tightly to its implementation. Say we decided to change Song to store the duration in milliseconds.
private jsp servlets 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.
private jsp servlets 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.
private jsp servlets
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