"Jason Voegele" <jason / jvoegele.com> wrote in message news:<26019.192.44.136.113.1005644448.squirrel / 12.27.88.122>...
> Paul Brannan and I are working on implementing a library of data structures 
> and algorithms for Ruby to fill this gap.  It is not yet available, but I 
> have a Set class that you can get at:
> (snip) 
> It is my hope that we'll be able to deliver something that becomes a 
> standard part of the Ruby programmer's toolset.
> 
While you're at it: I seem to remember that OCaml has tree as a
built-in data structure (and proud of it). Considering how pervasive
the tree structure is,I think this iwill be very useful to have.
-- rmc