gist: 7680


  
    
      car.rb
    
    
      
      
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              module Lib
  def self.my_attr_accessor(klass, attr)
    klass.class_eval "def #{attr.to_s}; @#{attr.to_s}; end"
    klass.class_eval "def #{attr.to_s}=(arg); @#{attr.to_s} = arg; end"
  end
end
 
class Car
  Lib::my_attr_accessor(self, 'color')
end
 
c = Car.new
c.color = 'rood'
puts c.color #=> 'rood'
 
c.color = 'groen'
puts c.color #=> 'groen'
 
puts "Hooray!!!!" #=> 'Hooray!!!!'