From: Patrick Doyle <wpdster@...>
Date: 2008-08-25T20:34:31+09:00
Subject: Re: indices of non nil elements in an array

Thanks.  That looks workable.  What I could also do (I decided in the
mean time) is to change my array into a hash whose keys happen to be
integers.  That way I could look at things like a.size and
a.keys.sort.

--wpd