Received: (at 79660) by debbugs.gnu.org; 20 Oct 2025 11:30:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 20 07:30:05 2025 Received: from localhost ([127.0.0.1]:44301 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1vAo5U-0000Ia-Vb for submit <at> debbugs.gnu.org; Mon, 20 Oct 2025 07:30:05 -0400 Received: from mail.eshelyaron.com ([107.175.124.16]:56796 helo=eshelyaron.com) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <me@HIDDEN>) id 1vAo5S-0000Fh-7O for 79660 <at> debbugs.gnu.org; Mon, 20 Oct 2025 07:30:03 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=eshelyaron.com; s=mail; t=1760959800; bh=KkJX/G0dguIrEKb0F+fP3T9zRqLNX69cwi9hta24pvQ=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=MJWwHy7aoB6AiRVmr8GZOoignHQoCC/N+AROzBBm8CHKPo/4CFsxElHRXFpvpM57y cnkrMyVCnwyMeqVph0CdvoozvV0w1puBB0eSdw99N4lNLJY5un5giUHv9QaLe29WgE 0psiBF1RBXJRsFaA9b/o5hPug/MMpU1Vuh7UAo3ohC2dvrkMgTL9HwMqtmoZGxc+le SWdKY2AwQM1ZqWlyzO3iBOnDfnp1UNi3l5UvJ5T9ffXRm4KQgbaiz7d+i5RMkmYWna jOhVhS+Kx4D/xEOA9BEClFTK5jhH0+l/2N9Ww1vk6DlQGiCYaPB407EtfiP0tcvh7n ZQEBFG5Ap7rGg== From: Eshel Yaron <me@HIDDEN> To: Augusto Stoffel <arstoffel@HIDDEN> Subject: Re: bug#79660: 30.2.50; let-alist lambdas In-Reply-To: <87cy6i2gi6.fsf@HIDDEN> References: <87cy6i2gi6.fsf@HIDDEN> Date: Mon, 20 Oct 2025 13:29:55 +0200 Message-ID: <87jz0pbyks.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79660 Cc: Artur Malabarba <emacs@HIDDEN>, 79660 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Hi Augusto, Augusto Stoffel <arstoffel@HIDDEN> writes: > When working with lots of alists, I often find myself writing > > (lambda (alist) (let-alist alist BODY)) > > which, while simple, is pretty cacophonous. So I'd like to suggest > adding a little new macro, let-alist-lambda or lambda-alist such that > > (lambda-alist BODY) > > expands to the above. Should this be (lambda-alist ALIST BODY...)? Or is the intention to "hardcode" the variable name 'alist' for the alist? I assume I'm CC'd as the last person to touch let-alist, but actually I've only investigated it to be able to analyze let-alist forms correctly in what became elisp-scope.el, so I don't really have any strong opinions about the proposed addition. Since I'm already here, I'll give my hot take: let-alist is currently not robust enough to implement new constructs on top of it. (Namely, the code analysis in let-alist--deep-dot-search suffers from both false negatives and false positives; I can elaborate if anybody's interested, I just don't want to derail the discussion from adding a new macro to problems in let-alist.) That said, lambda-alist seems simple enough that it doesn't introduce any additional issues, and I see that the pattern it simplifies indeed already occurs in core Emacs code, so why not? :) Eshel
bug-gnu-emacs@HIDDEN:bug#79660; Package emacs.
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Subject: 30.2.50; let-alist lambdas
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When working with lots of alists, I often find myself writing
(lambda (alist) (let-alist alist BODY))
which, while simple, is pretty cacophonous. So I'd like to suggest
adding a little new macro, let-alist-lambda or lambda-alist such that
(lambda-alist BODY)
expands to the above. Perhaps entirely superfluously, here are some
examples of how this would be used and looks pretty nice:
Find someone by name in a list of people:
(seq-some (lambda-alist (equal .name "John"))
people)
Sort a list of people by age:
(sort people :key (lambda-alist .age))
Augusto Stoffel <arstoffel@HIDDEN>:emacs@HIDDEN, me@HIDDEN, bug-gnu-emacs@HIDDEN.
Full text available.emacs@HIDDEN, me@HIDDEN, bug-gnu-emacs@HIDDEN:bug#79660; Package emacs.
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