dynamic_proxy.rb

# ====================
# Spell: Dynamic Proxy
# ====================

# Forward to another object any messages that don’t match a method.

class MyDynamicProxy
  def initialize(target)
    @target = target
  end

  def method_missing(name, *args, &block)
    "result: #{@target.send(name, *args, &block)}"
  end
end

obj = MyDynamicProxy.new("a string")
obj.reverse # => "result: gnirts a"

# For more information: http://www.pragprog.com/titles/ppmetr/metaprogramming-ruby