From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Kevin Rodgers Newsgroups: gmane.emacs.help Subject: Re: best way to get the list of unique keys from 2 alists Date: Fri, 16 Dec 2005 17:36:39 -0700 Message-ID: References: NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: sea.gmane.org 1134780125 9743 80.91.229.2 (17 Dec 2005 00:42:05 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sat, 17 Dec 2005 00:42:05 +0000 (UTC) Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Dec 17 01:41:56 2005 Return-path: Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1EnQ7f-0004wj-CE for geh-help-gnu-emacs@m.gmane.org; Sat, 17 Dec 2005 01:40:27 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EnQ8N-0002fE-4o for geh-help-gnu-emacs@m.gmane.org; Fri, 16 Dec 2005 19:41:11 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1EnQ72-0002dN-4Y for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 19:39:48 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1EnQ6z-0002b7-K0 for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 19:39:47 -0500 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1EnQ6y-0002ar-DD for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 19:39:45 -0500 Original-Received: from [80.91.229.2] (helo=ciao.gmane.org) by monty-python.gnu.org with esmtp (TLS-1.0:RSA_AES_128_CBC_SHA:16) (Exim 4.34) id 1EnQ9T-0001Rp-R5 for help-gnu-emacs@gnu.org; Fri, 16 Dec 2005 19:42:20 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1EnQ4d-0003lF-I5 for help-gnu-emacs@gnu.org; Sat, 17 Dec 2005 01:37:19 +0100 Original-Received: from 207.167.42.60 ([207.167.42.60]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 17 Dec 2005 01:37:19 +0100 Original-Received: from ihs_4664 by 207.167.42.60 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 17 Dec 2005 01:37:19 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-To: help-gnu-emacs@gnu.org Original-Lines: 35 Original-X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: 207.167.42.60 User-Agent: Mozilla Thunderbird 0.9 (X11/20041105) X-Accept-Language: en-us, en In-Reply-To: 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:32004 Archived-At: Kevin Rodgers wrote: > 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 know about remove-duplicates and union, but I'd like to avoid using > cl*.el functions. > > Since completing-read seems to ignore nil entries in TABLE, this is what > I've got now: > > (nconc (mapcar (lambda (assoc) > (list (symbol-name (car assoc)))) > alist-1) > (mapcar (lambda (assoc) > (or (assq (car assoc) alist-1) > (list (symbol-name (car assoc))))) > alist-2)) > > Is there a cleaner way? Since completing-read also accepts an obarray for its TABLE, I think this might be a little better: (let ((table (make-vector 83 0))) ; 83 is a suitable prime (mapc (lambda (assoc) (intern (symbol-name (car assoc)) table)) alist-1) (mapc (lambda (assoc) (intern (symbol-name (car assoc)) table)) alist-2) table) -- Kevin Rodgers