# Ron Jeffries implementing Extended Sets **URL:** \ **Category:** Ruby\ **Created:** [November 22, 2005, 11:11am UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574 "2005-11-22T11:11:47Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![pit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@pit](https://www.ruby-forum.com/u/pit)\ **Post date:** [November 22, 2005, 11:11am UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574/1 "2005-11-22T11:11:47Z")
For those of you not reading the Extreme Programming mailing list, Ron Jeffries is currently blogging about Extended Set Theory and a more or less test driven implementation in Ruby. You can find the articles here: [http://www.xprogramming.com/xpmag/index.htm](http://www.xprogramming.com/xpmag/index.htm) Regards, Pit ---
**Author:** ![pit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@pit](https://www.ruby-forum.com/u/pit)\ **Post date:** [November 22, 2005, 8:59pm UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574/2 "2005-11-22T20:59:56Z")
On Nov 22, 2005, at 4:07 AM, Pit C. wrote: > For those of you not reading the Extreme Programming mailing list, > Ron J. is currently blogging about Extended Set Theory and a > more or less test driven implementation in Ruby. You can find the > articles here: > > [http://www.xprogramming.com/xpmag/index.htm](http://www.xprogramming.com/xpmag/index.htm) This is a great series of articles and he openly invites insights from Ruby Gurus reading along. Bring your thinking caps! Thanks for sharing Pit. James Edward G. II ---
**Author:** ![pit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@pit](https://www.ruby-forum.com/u/pit)\ **Post date:** [November 23, 2005, 2:45pm UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574/3 "2005-11-23T14:45:18Z")
Jim M. schrieb: > I sent Ron the following two files to Ron a couple of days ago, and > received a nice reply. > > This quick-and-dirty implementation only uses an Array to store > objects. Ron pointed out that it will be much more interesting if the > objects were stored in files, perhaps mapping objects to things like > fixed-length records. Nice implementation, Jim! I’m curious about Ron’s final solution. Regards, Pit ---
**Author:** ![pit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@pit](https://www.ruby-forum.com/u/pit)\ **Post date:** [November 23, 2005, 2:13pm UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574/4 "2005-11-23T14:13:03Z")
I sent Ron the following two files to Ron a couple of days ago, and received a nice reply. This quick-and-dirty implementation only uses an Array to store objects. Ron pointed out that it will be much more interesting if the objects were stored in files, perhaps mapping objects to things like fixed-length records. ## Jim Jim M., removed\_email\_address@domain.invalid, removed\_email\_address@domain.invalid [http://www.io.com/~jimm](http://www.io.com/~jimm) “Any sufficiently complicated C or Fortran program contains an ad hoc informally-specified bug-ridden slow implementation of half of Common Lisp.” – Greenspun’s Tenth Rule of Programming ---
**Author:** ![pit](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/f14d63/32.png) [@pit](https://www.ruby-forum.com/u/pit)\ **Post date:** [November 28, 2005, 3:46am UTC](https://www.ruby-forum.com/t/ron-jeffries-implementing-extended-sets/48574/5 "2005-11-28T03:46:12Z")
On Tue, 22 Nov 2005 19:07:32 +0900, Pit C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > For those of you not reading the Extreme Programming mailing list, Ron > Jeffries is currently blogging about Extended Set Theory and a more or > less test driven implementation in Ruby. You can find the articles here: > > [http://www.xprogramming.com/xpmag/index.htm](http://www.xprogramming.com/xpmag/index.htm) > > Regards, > Pit Thanks for posting the link, Pit. XST is a topic that has been interesting to me for a long time … over the years I’ve done a number of products based on it. It’s an interesting technology and for some reason I felt like taking a different cut at it. I’m not sure where I’ll go with it at this point, but I’m trying to take an approach that’s more in line with the pure math of it all. Readers are welcome, and I welcome email advice on how it’s going. Be sure to include [ron] in the subject of any emails, to be sure of sneaking through my spam filters. Pit has already sorted me out to help me get back up to speed on Ruby … I’ve been away from it for a few years now, and glad to be back. Thanks, R