From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Ted Zlatanov Newsgroups: gmane.emacs.devel Subject: Re: New assoc-let package Date: Thu, 04 Dec 2014 14:36:40 -0500 Organization: =?utf-8?B?0KLQtdC+0LTQvtGAINCX0LvQsNGC0LDQvdC+0LI=?= @ Cienfuegos Message-ID: References: Reply-To: emacs-devel@gnu.org NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1417721851 28864 80.91.229.3 (4 Dec 2014 19:37:31 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 4 Dec 2014 19:37:31 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Dec 04 20:37:24 2014 Return-path: Envelope-to: ged-emacs-devel@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 1XwcDL-0003sG-LZ for ged-emacs-devel@m.gmane.org; Thu, 04 Dec 2014 20:37:23 +0100 Original-Received: from localhost ([::1]:47475 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwcDL-00041T-9o for ged-emacs-devel@m.gmane.org; Thu, 04 Dec 2014 14:37:23 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59091) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwcCz-000418-0C for emacs-devel@gnu.org; Thu, 04 Dec 2014 14:37:08 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1XwcCr-00011x-8x for emacs-devel@gnu.org; Thu, 04 Dec 2014 14:37:00 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:39847) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1XwcCr-00011s-3T for emacs-devel@gnu.org; Thu, 04 Dec 2014 14:36:53 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1XwcCq-0003ZX-7C for emacs-devel@gnu.org; Thu, 04 Dec 2014 20:36:52 +0100 Original-Received: from 198.0.146.153 ([198.0.146.153]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Dec 2014 20:36:52 +0100 Original-Received: from tzz by 198.0.146.153 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 04 Dec 2014 20:36:52 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Original-Lines: 28 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 198.0.146.153 X-Face: bd.DQ~'29fIs`T_%O%C\g%6jW)yi[zuz6; d4V0`@y-~$#3P_Ng{@m+e4o<4P'#(_GJQ%TT= D}[Ep*b!\e,fBZ'j_+#"Ps?s2!4H2-Y"sx" Mail-Copies-To: never User-Agent: Gnus/5.130012 (Ma Gnus v0.12) Emacs/25.0.50 (darwin) Cancel-Lock: sha1:JZcHy6L6MsLVTu6usQlPHtGGFMw= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:178850 Archived-At: On Wed, 3 Dec 2014 23:40:14 +0000 Artur Malabarba wrote: AM> Simply put, the macro takes an alist and a body, and makes the data of AM> the alist accessible by just writing the car of the desired cell AM> preceded by a dot. AM> For instance, the following: AM> (assoc-let alist AM> (if (and .title .body) AM> .body AM> .site)) AM> expands to AM> (let ((.title (cdr (assoc 'title alist))) AM> (.body (cdr (assoc 'body alist))) AM> (.site (cdr (assoc 'site alist)))) AM> (if (and .title .body) AM> .body AM> .site)) I really, really like it. Like a `destructuring-bind' for alists. Should it maybe use `lexical-let'? I hope it can go into the core so it's available by default. Ted