From: Patrick Doyle <wpdster@...>
Date: 2008-08-25T10:20:41+09:00
Subject: indices of non nil elements in an array

a = []
a[10] = "foo"

a.nitems returns a count of the non-nil, items. What is the simplest
way to return the indices of "a" that are not nil?

I'm sure there is some simple elegant way to do this, but I can't figure it out.

--wpd