From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#58278: Add new function seq-keep Date: Tue, 04 Oct 2022 01:47:59 +0200 Message-ID: <87pmf84ggg.fsf@gnus.org> References: <87y1twtx22.fsf@bernoul.li> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8146"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 58278@debbugs.gnu.org To: Jonas Bernoulli Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Oct 04 01:49:17 2022 Return-path: Envelope-to: geb-bug-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 1ofVBU-0001wQ-AC for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 04 Oct 2022 01:49:16 +0200 Original-Received: from localhost ([::1]:57274 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ofVBS-00045x-LC for geb-bug-gnu-emacs@m.gmane-mx.org; 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Original-Received: from [84.212.220.105] (helo=downe) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1ofVAG-0005sY-Ea; Tue, 04 Oct 2022 01:48:02 +0200 In-Reply-To: <87y1twtx22.fsf@bernoul.li> (Jonas Bernoulli's message of "Mon, 03 Oct 2022 23:30:13 +0200") Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAABGdBTUEAALGPC/xhBQAAACBj SFJNAAB6JgAAgIQAAPoAAACA6AAAdTAAAOpgAAA6mAAAF3CculE8AAAAElBMVEWwjWtxQT+fUEzR saT49O3///+dfHtVAAAAAWJLR0QF+G/pxwAAAAd0SU1FB+YKAxceMlEzPtoAAAGRSURBVDjLfZIB YsMgCEUVcwDjLqCYAzjJAbra+59pH026dHWjasUX+BFizNzs5Cz+CcIUUB8TYEeyWao/xKPxhjtI 66t1/wrC9YmowNvoiWMki10ICe4AkZA4es82Ugwp2XQCNjjpgA2nlNgPDZ+sPwAZZmtPECydIJg4 wKnBAIGtD0j1AsyIQApP11Ts8VZhTWHlAHUOIwJ30xbQccFQjwtCT2tUMB3DPghhAK4smOIUiC7L Ud3FCKzgZ5w0pw6eEgVwdjhiFvzvpWHfToABkR5cMOBCQ4aw6TtXXjpYZq0dYuUdPNTktIfsD9GT rwEu1nZxUyCtIWoCbjidgdaPO3gK672xtNykA+JXs8wr728g6Vx5+TKNcl3yPW+u1lxdZKoun2B3 krdM91wkW1vNAJxZsuScuWZUhy6Aar4BUN3QSbpXOUCstx4BwAD1AA/Sjg+Qn6C/LsSlg09Vq/Ve tg4YX+LWXI5cI0sspOIKbOKohS7jpqGvPZUxWjpFPwXYf1VXK4mOYH3vx2H/AJnb5zdoRIS3tuUh TAAAACV0RVh0ZGF0ZTpjcmVhdGUAMjAyMi0xMC0wM1QyMzozMDo0OSswMDowMLr3pY0AAAAldEVY dGRhdGU6bW9kaWZ5ADIwMjItMTAtMDNUMjM6MzA6NDkrMDA6MDDLqh0xAAAAAElFTkSuQmCC X-Now-Playing: Scritti Politti's _Cupid & Psyche 85_: "Hypnotyze" X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:244343 Archived-At: Jonas Bernoulli writes: > Unfortunately I cannot find a replacement for `-keep', which I have been > using a lot. I propose that we add something like: > > (cl-defgeneric seq-keep (pred sequence) > "Return a list of all non-nil results of (PRED element) for elements in SEQUENCE." > (delq nil (seq-map (lambda (elt) (funcall pred elt)) > sequence))) Hm... well, here PRED isn't a predicate, really, but a transforming function? But you wish to filter out the nil results of that transforming function. That sounds useful -- there's more than a 100 matches for "delq nil.*map" in-tree only -- but it's slightly confusing that the function isn't altogether a predicate, but only kinda. Would a function signature like (cl-defgeneric seq-keep (function sequence &optional pred) ...) make more sense for this combination of map/filter? (The default predicate would, of course, be "not null".)