From: Ronald Fischer <ronald.fischer@...>
Date: 2007-08-23T19:58:25+09:00
Subject: Selecting indices from an array

For an array a, I would like to know all the indices i where a[i]
fulfils
some condition. My solution (which works) looks like this:

a=%w(Deutschlandsberg Stainz Preding Eibiswald)
(0...a.size).select {|i| a[i]=~/g$/} #  ==> [0,2]

What I don't like with this solution is that inside the code block
supplied to select, I also have to access the array variable a which
is declared outside. I would prefer having my code block "self 
contained", using only the variables passed as parameter.

Is there in Ruby a function similar select, where I also get the array
element passed through, kind of:

   a.select_index {|index,value| value?~/g$/}

or do I have to write my own here? I don't want to reinvent the
wheel....

Ronald
-- 
Ronald Fischer <ronald.fischer@venyon.com>
Phone: +49-89-452133-162