From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Pascal J. Bourguignon" Newsgroups: gmane.emacs.help Subject: Re: member returns list Date: Sun, 06 Sep 2015 01:39:10 +0200 Organization: Informatimago Message-ID: <87oahgbfmp.fsf@kuiper.lan.informatimago.com> References: <55E5C99B.3020608@yandex.ru> <87lhcpu2wb.fsf_-_@debian.uxu> <874mjchisl.fsf@web.de> <87pp20jxy7.fsf@debian.uxu> <87twrcxyfk.fsf@mbork.pl> <87y4gnt2r5.fsf@debian.uxu> <87twran0dw.fsf@mbork.pl> <87d1xwbwh9.fsf@debian.uxu> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1441496418 27203 80.91.229.3 (5 Sep 2015 23:40:18 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sat, 5 Sep 2015 23:40:18 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Sep 06 01:40:17 2015 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1ZYN4D-0006p4-1R for geh-help-gnu-emacs@m.gmane.org; Sun, 06 Sep 2015 01:40:17 +0200 Original-Received: from localhost ([::1]:43443 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZYN4C-0007B4-GI for geh-help-gnu-emacs@m.gmane.org; Sat, 05 Sep 2015 19:40:16 -0400 Original-Path: usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 46 Original-X-Trace: individual.net zb/PTDDuYUjpQmPuKOGYLgL6FvbLGiRCeaS+Acj+a/pt/nwc49 Cancel-Lock: sha1:ZTZkOWM0NGU5ODM2NDM4YWJhNjQyOTE0OGZkNjIxZGY0ODMyOTdlNA== sha1:CweEjmpEPxgiJwY/RNRKhgDVFHc= Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwAQMAAABtzGvEAAAABlBMVEUAAAD///+l2Z/dAAAA oElEQVR4nK3OsRHCMAwF0O8YQufUNIQRGIAja9CxSA55AxZgFO4coMgYrEDDQZWPIlNAjwq9 033pbOBPtbXuB6PKNBn5gZkhGa86Z4x2wE67O+06WxGD/HCOGR0deY3f9Ijwwt7rNGNf6Oac l/GuZTF1wFGKiYYHKSFAkjIo1b6sCYS1sVmFhhhahKQssRjRT90ITWUk6vvK3RsPGs+M1RuR mV+hO/VvFAAAAABJRU5ErkJggg== X-Accept-Language: fr, es, en User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) Original-Xref: usenet.stanford.edu gnu.emacs.help:214754 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:107038 Archived-At: Random832 writes: > Emanuel Berg writes: > >> If we stick to `member' (using `equal') vs. `memq' >> (using `eq'), this renaming of those: >> >> member-equal >> member-eq >> >> would be seen by some people as more consistent than >> the actual >> >> member >> memq > > Why not simply eliminate both and have something like > (member-test #'eq object list) > > Or > (member-if (lambda (x) (eq object x)) list)? There were a lot of variants and propositions, amongst all the lisp dialects. Then starting from 1984, some interested corporations and institutes invested a lot of money (in form of salaries to detached employees), to form a standardization commitee and decide on this all all similar kinds of discrepancies that made porting lisp programs from one lisp to the other a PITA. They worked hard, for ten years. Then money was exhausted, so they finalized an ANSI Common Lisp standard in 1994. Therefore nowadays, you write: (member element list :test (function eql)) (member element list :test (function equal)) (member element list :test (function equalp)) (member element list :test (function your-own-equivalence-relationship)) or member* in emacs lisp since RMS doesn't want to rejoin the common community of lispers… -- __Pascal Bourguignon__ http://www.informatimago.com/ “The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.” -- Carl Bass CEO Autodesk