From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: let-alist can't deal with the keys which includes spaces. Date: Tue, 20 Jul 2021 19:50:37 +0200 Message-ID: <875yx4zxg2.fsf@zoho.eu> References: <87h7gpyp51.fsf@omarpolo.com> <20210720162013.GB14831@tuxteam.de> <87czrdylk6.fsf@zoho.eu> <20210720170828.GC14831@tuxteam.de> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="17474"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:l1r97mMw/15wwBkY6fqP4cFHTu0= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jul 20 19:51:30 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m5ttx-0004HE-LZ for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 20 Jul 2021 19:51:29 +0200 Original-Received: from localhost ([::1]:35746 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1m5ttw-0003WO-N4 for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 20 Jul 2021 13:51:28 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59552) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m5ttL-0003UD-Iy for help-gnu-emacs@gnu.org; Tue, 20 Jul 2021 13:50:51 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:55888) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1m5ttJ-0008N2-He for help-gnu-emacs@gnu.org; Tue, 20 Jul 2021 13:50:51 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1m5ttH-0003OR-NW for help-gnu-emacs@gnu.org; Tue, 20 Jul 2021 19:50:47 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:131893 Archived-At: tomas wrote: >> Uhm, what is the purpose with `let-alist' and "dotted >> symbols" to begin with? > > `let-alist' is just a handy way to destructure an alist. > > Assume we have > > (setq colours '((poppy . red) (cornflower . blue) (sunflower . yellow))) > > Instead of doing > > (let ((rose (alist-get 'rose colours)) > (cornflower (alist-get 'cornflower colours)) > (sunflower (alist-get 'sunflower colours))) > ;; do something with rose, cornflower... > ) > > you just do > > (let-alist colours > ;; do something with .rose, .cornflower... > ) The docstring is confusing IMO, your example so-so but better because of the initial "`let-alist' is just a handy way to destructure an alist" line, but why not just put it like this? (setq numbers '((one . 1) (two . 2) (three . 3) (four . 4) )) (let-alist numbers (list .one .two .three .four) ) ; (1 2 3 4) > The dots are part of the symbol name, they aren't special > Lisp syntax. Perhaps, but in practice they are part of the `let-alist' special syntax. -- underground experts united https://dataswamp.org/~incal