Tercer ejercicio del taller de metaprogramación

three.rb

module Donor
  def foo(extra)
    puts "bar #{extra}"
  end

  def not_foo
    puts "not bar"
  end
end

module Extractor
  def pick(method_name, module_obj)
    # si captura aqui, se queda cacheada la implementacion
    define_method(method_name) do |*args|
      module_obj.instance_method(method_name).bind(self)[*args]
    end
  end
end

class Three
  extend Extractor
  pick :foo, Donor
end

three = Three.new

three.foo('plas')

begin
  three.not_foo
rescue
  puts "cazado"
end