From: "Christoffer Lernö" <lerno@...>
Date: 2007-03-15T04:38:53+09:00
Subject: Re: Anyone playing with higher order messaging in ruby?

On Mar 14, 2007, at 20:04 , Christoffer Lern� wrote:

> In a more generalized case, you want to use a block to act as a class.
>
> module Trampolines
>   class Trampoline
>     def initialize(block)
>       @block = block
>     end
>     def method_missing(symbol, *args, &block)
>       args << block if block
>       @block.call(symbol, *args)
>     end
>   end
> end
>
> def trampoline(&block)
>   raise "Missing block" unless block
>   Trampolines::Trampoline.new(block)
> end

This code adds methods to all enumerables.

module Enumerable
   %w(each collect select reject).each do |method|
     class_eval "def #{method}_do; trampoline { |m, b, *a| #{method}  
{ |o| o.__send__(m, *a, &b) } }; end"
   end
end

For example

["a", "b", "c"].reject_do[/a/]  # => ["b", "c"]
["a", "b", "c"].collect_do.capitalize #=> ["A", "B", "C"]