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ssh2 client . def to_s "KS: #{@name}--#{@artist} (#{@duration}) [#{@lyrics}]" end end aSong = KaraokeSong.new("My Way", "Sinatra", 225, "And now, the...
ssh2 client ") aSong.to_s » "KS: My Way--Sinatra (225) [And now, the...]" We're correctly displaying the value of the @lyrics instance variable.
ssh2 client 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.
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