From: Jason Roelofs <jameskilton@...>
Date: 2007-03-15T04:57:03+09:00
Subject: Re: Anyone playing with higher order messaging in ruby?

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I haven't personally messed with this kind of stuff but code like this just
makes me love Ruby even more. These types of, well DSL is really the best
way to describe it, in such little code, makes Ruby such a blast to program
in, and it's readable too!

Jason

On 3/14/07, Christoffer Lern=F6 <lerno@dragonascendant.com> wrote:
>
> On Mar 14, 2007, at 20:04 , Christoffer Lern=F6 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 =3D 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/]  # =3D> ["b", "c"]
> ["a", "b", "c"].collect_do.capitalize #=3D> ["A", "B", "C"]
>
>
>
>

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