Dynamic Proxy - Illustrates how to wrap and then forward method calls to another object

dynamic_proxy.rb

class Proxy
  def initialize(object)
    @object = object
  end

  # forward all calls to the wrapped object
  def method_missing(method_name, *args)
    @object.send(method_name, *args)
  rescue 
    puts "#{method_name} is not supported by the wrapped object!"  
  end
end

# usage
Proxy.new("this is a string").length # => 16
Proxy.new([1, 2, 3]).length # => 3
Proxy.new({:a => 1, :b => 2}).length # => 2
Proxy.new(true).length # => length is not supported by the wrapped object!