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: cl-dolist, dolist, cl-return, Date: Wed, 08 Jul 2015 05:25:32 +0200 Organization: Informatimago Message-ID: <874mlfs53n.fsf@kuiper.lan.informatimago.com> References: 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 1436326222 14946 80.91.229.3 (8 Jul 2015 03:30:22 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 8 Jul 2015 03:30:22 +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 Jul 08 05:30:18 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 1ZCg3u-0003xg-Cy for geh-help-gnu-emacs@m.gmane.org; Wed, 08 Jul 2015 05:30:18 +0200 Original-Received: from localhost ([::1]:33108 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZCg3t-0004aY-LE for geh-help-gnu-emacs@m.gmane.org; Tue, 07 Jul 2015 23:30:17 -0400 Original-Path: usenet.stanford.edu!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail Original-Newsgroups: gnu.emacs.help Original-Lines: 47 Original-X-Trace: individual.net ByYKrq4/FCw/8b8ORiqZkASomGwjXWQ9F3TsFrGh1ynEuYaPKC Cancel-Lock: sha1:ODA5MjBkOTdjMzlmODA5Y2I2NmM3YzJhNTk5OWQ5ZmVmOTIyYTBiMA== sha1:8QbFOBRThY6Z5W798AnwHjWYdfo= 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:213224 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:105511 Archived-At: Emanuel Berg writes: > I just wrote the below code. > > `cl-return' works for `cl-dolist', but not for > `dolist' because it hasn't an "implicit nil block ... > established around the loop". And there is no > `return'! I think this "cl-" stuff is confusing. > Anyone cares to explain? emacs lisp is too limited, it lack Common Lisp packages or any other way of namespace. Therefore people have to use prefixes instead of package names. > By the way, I know there are one zillion loops > in Lisp. What is the conventional way to > > 1. iterate a list > 2. until some condition is met for some element > 3. then break, to speak in C > > ? (loop for item in list until (some-condition-p item)) > And: With [cl-]dolist, if the list is an expression > and not an atom, does that get evaluated once, or does > it happen every iteration like, say, a string length > test would, again in C? Once. > Also: why isn't there a "neq"? (defun neq (x y) (not (eq x y)) ; now there is. -- __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