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cheap jsp web site hosting ") aSong.to_s » "KS: My Way--Sinatra (225) [And now, the...]" We're correctly displaying the value of the @lyrics instance variable.
cheap jsp web site hosting 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. Suddenly,KaraokeSong would start reporting ridiculous values.
cheap jsp web site hosting 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. The trick here is the Ruby keyword ``super''.
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