From: Clemens Hintze <c.hintze@...>
Date: 2001-10-27T07:54:25+09:00
Subject: [ruby-talk:23565] Re: RCR #50 Simplifying the use of map by adding optional parameter

Robert Feldt wrote:
> 
> Hi,

Hello Robert,

> Below is a new RCR. If you feel anything about it please go to
> 
> http://www.rubygarden.com/article.php?sid=127

to achieve similar goal, I did write a small utility that I called
HOM. It looks like:

  module Enumerable
    class HOM
      def initialize(container, inplace)
        @every = container.method(inplace ? :collect! : :collect)
      end
      def method_missing(mid, *args)
        @every.call { |e| e.send(mid, *args) }
      end
    end
    def every; HOM.new(self, false) end
    def every!; HOM.new(self, true) end
  end

You can use it like this:

  arr = [2, 3, 4, 5]

  p arr.every + 5 * 6   #-> [32, 33, 34, 35]
  p arr                 #-> [2, 3, 4, 5]

  arr.every!.succ
  p arr                 #-> [3, 4, 5, 6]

Would this somewhat do what you want?

But your proposal could also prove useful, though.

Ciao,
\cle