From: Pit Capitain <pit@...>
Date: 2002-03-14T16:06:48+09:00
Subject: Re: process two arrays pairwise?

On 14 Mar 2002, at 4:23, Ron Jeffries wrote:

> On Wed, 13 Mar 2002 16:55:45 GMT, Paul Brannan <paul@atdesk.com>
> wrote:
> 
> >On Thu, Mar 14, 2002 at 01:00:01AM +0900, Ron Jeffries wrote:
> >> Is there somewhere in Ruby a way to process the elements of two
> >> arrays (of equal size), pairwise?
> >
> >There are a number of options.  I'll let you dig through them:
> >
> >http://www.rubycentral.com/faq/rubyfaq-5.html#ss5.5
> >http://www.rubygarden.org/article.php?sid=107
> >http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/rubycollections/rubyco
> >llections/rbc/iterator/ http://www.hduchene.de/ruby/index.html
> 
> Hmm, well, those aren't it. Thanks! Maybe I like what I had best for
> now: it has the virtue of simplicity.

Don't know exactly what you didn't like about those, but just in 
case you're still willing to look for alternatives: there's generator.rb 
in http://www.ruby-lang.org/~knu/cgi-bin/cvsweb.cgi/rough/lib

Your example

  array1.each_with_index { | a1, i |
    a2 = array2[i]
    # process a1, a2
  }

then becomes

  SyncEnumerator.new( array1, array2 ).each { | a1, a2 |
    # process a1, a2
  }

Regards,
Pit