From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.help Subject: Re: best way to get the list of unique keys from 2 alists Date: Sun, 18 Dec 2005 10:20:53 -0500 Organization: Bell Sympatico Message-ID: <87vexmo2kf.fsf-monnier+gnu.emacs.help@gnu.org> References: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: sea.gmane.org 1134920768 1074 80.91.229.2 (18 Dec 2005 15:46:08 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sun, 18 Dec 2005 15:46:08 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sun Dec 18 16:46:07 2005 Return-path: Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1Eo0jT-0004Zc-LD for geh-help-gnu-emacs@m.gmane.org; Sun, 18 Dec 2005 16:45:55 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Eo0kH-0005FE-43 for geh-help-gnu-emacs@m.gmane.org; Sun, 18 Dec 2005 10:46:45 -0500 Original-Path: shelby.stanford.edu!newsfeed.stanford.edu!postnews.google.com!news4.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!wns13feed!worldnet.att.net!207.35.177.252!nf3.bellglobal.com!nf1.bellglobal.com!nf2.bellglobal.com!news20.bellglobal.com.POSTED!not-for-mail Original-Newsgroups: gnu.emacs.help User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) Cancel-Lock: sha1:iyj7TZ7QsMfZgadGxtB81yvepsk= Original-Lines: 13 Original-NNTP-Posting-Host: 65.92.242.250 Original-X-Complaints-To: abuse@sympatico.ca Original-X-Trace: news20.bellglobal.com 1134919253 65.92.242.250 (Sun, 18 Dec 2005 10:20:53 EST) Original-NNTP-Posting-Date: Sun, 18 Dec 2005 10:20:53 EST Original-Xref: shelby.stanford.edu gnu.emacs.help:136416 Original-To: help-gnu-emacs@gnu.org X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:32035 Archived-At: > I've got 2 alists of (SYMBOL . "STRING") pairs, and I need to get the > list of unique symbol names to pass to completing-read as its TABLE > argument: (("SYMBOL-NAME") ...) I'd just do: (completing-read "foo" (mapcar (lambda (x) (symbol-name (car x))) (append list1 list2))) You don't need to remove duplicates. Stefan