From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Mark Oteiza Newsgroups: gmane.emacs.devel Subject: Re: What about seq-slice? Date: Fri, 30 Jan 2015 12:17:28 -0500 Message-ID: <871tmcb32v.fsf@udel.edu> References: <878uglwmra.fsf@petton.fr> <87iofoof2j.fsf@udel.edu> <87k304ef9k.fsf@petton.fr> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1422652760 1167 80.91.229.3 (30 Jan 2015 21:19:20 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 30 Jan 2015 21:19:20 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Jan 30 22:19:16 2015 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 1YHIyB-0006GJ-1P for ged-emacs-devel@m.gmane.org; Fri, 30 Jan 2015 22:19:15 +0100 Original-Received: from localhost ([::1]:38742 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YHIyA-0004BR-D5 for ged-emacs-devel@m.gmane.org; Fri, 30 Jan 2015 16:19:14 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59738) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YHFCH-0002XK-SV for emacs-devel@gnu.org; Fri, 30 Jan 2015 12:17:34 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YHFCE-0004FS-MX for emacs-devel@gnu.org; Fri, 30 Jan 2015 12:17:33 -0500 Original-Received: from mail-qa0-f53.google.com ([209.85.216.53]:51970) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YHFCE-0004F3-JH for emacs-devel@gnu.org; Fri, 30 Jan 2015 12:17:30 -0500 Original-Received: by mail-qa0-f53.google.com with SMTP id n4so20854096qaq.12 for ; Fri, 30 Jan 2015 09:17:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:subject:references:date:in-reply-to :message-id:user-agent:mime-version:content-type; bh=2sOKSVU7BZNsUZUyVa6N3vxWfY0s9XwyW5drsfngJYA=; b=bnY5EMjHGsm9Oz/DdPaQK7d4gqd1skX0toxEVU9DnGfzpM7guqspOaZ9DGHOuTEmCp xYnViBHMuIvKxOY9WIdOS2/rzrgqau9eB7JYhq3C3brnxyGU0Ee/BZhZCW8MKHG0SQtJ 46pbIgmc5iCh69bvvtdz9S5GSxFKGOOkOaXWCsGMz5Wo5CNsG3kRM0O7dvUvN0nyfr+5 XCcgjFys+FleUJMmdUf3QdcfGRL33esQr+pKpPJPIl6iMYPp97hXEOKBeEjUTQeWrLVi SDzL0zD9BqBOdHsq3UGZV5jONCZZ7NudIcBpaIiljgXI/gOQVO1Ums47sy8VqjujuOiz KVog== X-Gm-Message-State: ALoCoQkVKplCSO6s+bpJcSoldMRHP/22q40D/ij9vQBtRAeP/y9P6MlYdRl46Zlxa06/6r7/2LGJ X-Received: by 10.140.86.75 with SMTP id o69mr9981134qgd.98.1422638250135; Fri, 30 Jan 2015 09:17:30 -0800 (PST) Original-Received: from holos (c-73-163-124-41.hsd1.md.comcast.net. [73.163.124.41]) by mx.google.com with ESMTPSA id n4sm10594441qas.20.2015.01.30.09.17.29 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 30 Jan 2015 09:17:29 -0800 (PST) In-Reply-To: <87k304ef9k.fsf@petton.fr> (Nicolas Petton's message of "Fri, 30 Jan 2015 11:25:59 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.85.216.53 X-Mailman-Approved-At: Fri, 30 Jan 2015 16:19:09 -0500 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:182095 Archived-At: Nicolas Petton writes: > Mark Oteiza writes: >> Coincidentally, I had been thinking about additions to seq.el. I'm >> interested in having a function like Ruby's each_slice[0] method. For >> example, >> >> (defun seq-slice (seq n) >> "Return a list of subsequences of SEQ, each a sequence of >> length N. The last subsequence may have less than N elements. >> >> If N is a negative integer or zero, a list containing SEQ is >> returned." >> (if (or (<= n 0) >> (>= n (seq-length seq))) >> (list seq) >> (let ((copy (seq-copy seq)) >> (result '())) >> (while (not (seq-empty-p copy)) >> (push (seq-take copy n) result) >> (setq copy (seq-drop copy n))) >> (nreverse result)))) >> >> I didn't think dash.el had it until I realized it is named something >> else: -partition-all[1]. >> >> [0]: http://ruby-doc.org/core-2.2.0/Enumerable.html#method-i-each_slice >> [1]: https://github.com/magnars/dash.el/blob/master/dash.el#L730 > > Hi Mark, > > I'm not sure I understand how to use it. In which scenario would you > find `seq-slice' useful? When one has a large number of things but is only "allowed" to use N of them at a time. For instance, a large number of usernames and an API that limits the number of users in a single query.