Re: Lisp refactoring puzzle

Path	csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!news.musoftware.de!wum.musoftware.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From	Neil Cerutti <neilc@norwich.edu>
Newsgroups	gnu.emacs.help, comp.emacs, comp.lang.lisp, comp.lang.python
Subject	Re: Lisp refactoring puzzle
Date	12 Jul 2011 19:44:33 GMT
Organization	Norwich University
Lines	19
Message-ID	<983mh1Fs7cU1@mid.individual.net> (permalink)
References	<19f8eb5b-cc90-472a-8399-4a5787b6fecf@glegroupsg2000goo.googlegroups.com> <c1749ae0-46ee-4ae6-a4e9-60eaebbc2a35@e18g2000vbx.googlegroups.com> <2c59f63a-b46f-4ea9-bc12-da4841687117@l28g2000yqc.googlegroups.com> <5cb297e4-6a39-461c-98c5-639e72e166af@p10g2000prf.googlegroups.com> <87y603nwys.fsf@pangea.home.gustad.com>
Mime-Version	1.0
Content-Type	text/plain; charset=us-ascii
Content-Transfer-Encoding	7bit
X-Trace	individual.net Gs/YC07hCrtaeIE4Wq1Dlw6bTZT/awo7Z+tKx7bFZpQVsGszFS
Cancel-Lock	sha1:iHu+v2SRHsqxbV5pwE7dZ1NikeI=
User-Agent	slrn/0.9.9p1/mm/ao (Win32)
Xref	x330-a1.tempe.blueboxinc.net comp.emacs:687 comp.lang.lisp:4688 comp.lang.python:9344

Cross-posted to 4 groups.

Show key headers only | View raw

On 2011-07-12, Petter Gustad <newsmailcomp6@gustad.com> wrote:
> Xah Lee <xahlee@gmail.com> writes:
>
>> it's funny, in all these supposedly modern high-level langs, they
>> don't provide even simple list manipulation functions such as union,
>> intersection, and the like. Not in perl, not in python, not in lisps.
>
> In Common Lisp you have:
>
> CL-USER> (union '(a b c) '(b c d))
> (A B C D)
> CL-USER> (intersection '(a b c) '(b c d))
> (C B)

What's the rationale for providing them? Are the definitions
obvious for collections that a not sets?

-- 
Neil Cerutti

Thread

Re: Lisp refactoring puzzle Xah Lee <xahlee@gmail.com> - 2011-07-11 20:37 -0700
  Re: Lisp refactoring puzzle jvt <vincent.toups@gmail.com> - 2011-07-12 07:30 -0700
  Re: Lisp refactoring puzzle "WJ" <w_a_x_man@yahoo.com> - 2011-07-12 15:27 +0000
  Re: Lisp refactoring puzzle fortunatus <daniel.eliason@excite.com> - 2011-07-12 09:16 -0700
  Re: Lisp refactoring puzzle gene heskett <gheskett@wdtv.com> - 2011-07-12 14:23 -0400
  Re: Lisp refactoring puzzle Petter Gustad <newsmailcomp6@gustad.com> - 2011-07-12 21:02 +0200
    Re: Lisp refactoring puzzle Neil Cerutti <neilc@norwich.edu> - 2011-07-12 19:44 +0000
      Re: Lisp refactoring puzzle "Pascal J. Bourguignon" <pjb@informatimago.com> - 2011-07-13 00:51 +0200
      Re: Lisp refactoring puzzle William Clifford <wobh@yahoo.com> - 2011-07-13 17:53 -0700
    Re: Lisp refactoring puzzle "WJ" <w_a_x_man@yahoo.com> - 2011-07-12 19:52 +0000
  Re: Lisp refactoring puzzle Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-07-13 13:47 +1200
    Re: Lisp refactoring puzzle Roy Smith <roy@panix.com> - 2011-07-12 21:58 -0400
  Re: Lisp refactoring puzzle Terry Reedy <tjreedy@udel.edu> - 2011-07-13 00:39 -0400
    Re: Lisp refactoring puzzle rusi <rustompmody@gmail.com> - 2011-07-12 22:10 -0700
  Re: Lisp refactoring puzzle Teemu Likonen <tlikonen@iki.fi> - 2011-07-13 11:29 +0300
    Re: Lisp refactoring puzzle Terry Reedy <tjreedy@udel.edu> - 2011-07-13 10:34 -0400
      Re: Lisp refactoring puzzle Teemu Likonen <tlikonen@iki.fi> - 2011-07-13 18:25 +0300
    Re: Lisp refactoring puzzle Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-07-14 15:12 +1200

csiph-web