Refinement example

# Original AFooClass
class AFoo
  def bar
    puts "Foooo Bar"
  end
end

# Refining Module
module RefiningAFoo
  refine AFoo do
    def bar
      puts "AFoo#bar by RefiningAFoo"
    end

    def i_am_lexical
      puts "I can't be called dynamically"
    end
  end
end

# Class to use the refined AFooClass
class AFooRefiner
  using RefiningAFoo

  def bar
    a = AFoo.new
    a.bar
  end

  def dynamic_call
    a = AFoo.new
    a.send(:i_am_lexical)
  end

  def lexical_call
    a = AFoo.new
    a.i_am_lexical
  end
end


# afoo = AFoo.new
# afoo.bar
#=> Foooo Bar

# refinedbar = AFooRefiner.new
# refinedbar.bar
#=> AFoo#bar by RefiningAFoo

#=> refinedbar = AFooRefiner.new
#=> #<AFooRefiner:0x007f9cb492c748>
#=> refinedbar.dynamic_call
# NoMethodError: undefined method `i_am_lexical' for #<AFoo:0x007f9cb491fef8>
#=> refinedbar.lexical_call
#=>I can't be called dynamically