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@charly
Created August 19, 2009 17:04
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require 'rubygems'
require 'mixology'
module Creme
def cost
super + 0.4
end
end
class Coffee
def cost
3
end
end
coffee = Coffee.new
coffee.mixin Creme
coffee.cost # => 3.4
# Waitress, please I asked for a black coffee
coffee.unmix Creme
coffee.cost # => 3
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