From: David Alan Black <dblack@...>
Date: 2002-07-11T08:54:23+09:00
Subject: Re: spliter of for...each: looping

Hi --

On Thu, 11 Jul 2002, Tom Sawyer wrote:

> david,
>
> oh, my mistake, it all ready exists! yea!
>
> only if it would match against -1 for last index though....oh well,
> can't have everything.

Here's a method with an even longer name :-) (by one character) which
gives the negative indices:

  module Enumerable
    def each_with_nindex
      s = -1 - size
      each {|e| yield e, s += 1}
    end
  end

  %w{ a b c d e }.each_with_nindex do |e,i|
    if i == -1
      puts "Last element: #{e}"
    end
  end

  # =>  Last element: e


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav