Alias Method Alternative

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 http://blog.jayfields.com/2006/12/ruby-alias-method-alternative.html

Code

 class ClockRadio
  on = self.instance_method(:on!)

  define_method(:on!) do
    on.bind(self).call
    @display_time = true
  end

  def display_time?
    @display_time
  end
 end