From: dblack@...
Date: 2003-05-30T06:46:42+09:00
Subject: Re: Iteration - last detection

Hi --

On Fri, 30 May 2003, ahoward wrote:

> module Enumerable
>   def each_with_last(&block)
>     l = nil
>     each_with_index do |e, i|
>       block.call l, false if i > 0
>       l = e
>     end
>     block.call l, true
>   end
> end

Let Ruby do more of the work for you :-)

  module Enumerable
    def each_with_last
      each_with_index {|e,i| yield(e, i == size-1)}
    end
  end

(Hmmm... could this be the non-superfluous use of
Enumerable#each_with_index (as opposed to just Array#ewi) that I've
been looking for for 2.5 years? :-)


David

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