From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.help Subject: member (was: Re: To `boundp' or not to `boundp'?) Date: Wed, 02 Sep 2015 02:40:21 +0200 Message-ID: <87vbbtr6ve.fsf_-_@debian.uxu> References: <55E5C99B.3020608@yandex.ru> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1441153972 5115 80.91.229.3 (2 Sep 2015 00:32:52 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 2 Sep 2015 00:32:52 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Wed Sep 02 02:32:43 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 1ZWvyk-0006NR-2u for geh-help-gnu-emacs@m.gmane.org; Wed, 02 Sep 2015 02:32:42 +0200 Original-Received: from localhost ([::1]:59806 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZWvyj-0006Tb-NC for geh-help-gnu-emacs@m.gmane.org; Tue, 01 Sep 2015 20:32:41 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:51650) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZWvyX-0006SO-7Y for help-gnu-emacs@gnu.org; Tue, 01 Sep 2015 20:32:30 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZWvyS-0002gq-8g for help-gnu-emacs@gnu.org; Tue, 01 Sep 2015 20:32:29 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:47464) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZWvyS-0002ge-2a for help-gnu-emacs@gnu.org; Tue, 01 Sep 2015 20:32:24 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZWvyP-00069Z-6v for help-gnu-emacs@gnu.org; Wed, 02 Sep 2015 02:32:21 +0200 Original-Received: from nl106-137-244.student.uu.se ([130.243.137.244]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 02 Sep 2015 02:32:21 +0200 Original-Received: from embe8573 by nl106-137-244.student.uu.se with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 02 Sep 2015 02:32:21 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Original-Lines: 19 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: nl106-137-244.student.uu.se Mail-Copies-To: never User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) Cancel-Lock: sha1:+JLZSyb4E0nyml+oonhohfhRrl4= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 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:106974 Archived-At: Barry Margolin writes: > It's no more misleading than MEMBER, which > intuitively seems like it would just return > a boolean, but actually returns the tail of the list > where the element was found. I guess one can do something like this. But probably it will only lead to even more confusion. (defun memberp (e l) (when (member e l) t) ) (memberp 1 '(1 2 3 4)) ; t (memberp 0 '(1 2 3 4)) ; nil -- underground experts united http://user.it.uu.se/~embe8573