From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: emacs-devel@gnu.org
Subject: Re: pcase-dolist
Date: Thu, 09 Jul 2015 15:26:42 -0400 [thread overview]
Message-ID: <jwvpp41dtks.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <87oajlyif9.fsf@gnu.org> (Tassilo Horn's message of "Thu, 09 Jul 2015 08:05:46 +0200")
> Yes, if you want to pick the first two elements of a list with 2 or more
> elements, you should use `(,w ,x . ,_). I see that the above is
> slightly more convenient and concise but I'd value consistency more.
But that does not match the usual uses of "tuples represented as lists",
where it's customary to use (A B) when the remaining fields are all nil
(since (car nil) returns nil and (nth 5 '(1 2)) also returns nil rather
than signaling an error) and where it's also customary to ignore any
additional element.
IOW maybe your approach seems more consistent, but not only does it
generate less efficient code, but it also requires extra source code in
the usual cases.
Stefan
next prev parent reply other threads:[~2015-07-09 19:26 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 12:20 pcase-dolist Michael Heerdegen
2015-07-08 13:54 ` pcase-dolist Stefan Monnier
2015-07-08 17:32 ` pcase-dolist Michael Heerdegen
2015-07-08 18:26 ` pcase-dolist Tassilo Horn
2015-07-08 21:27 ` pcase-dolist Stefan Monnier
2015-07-09 6:05 ` pcase-dolist Tassilo Horn
2015-07-09 9:55 ` pcase-dolist Thierry Volpiatto
2015-07-09 10:17 ` pcase-dolist Tassilo Horn
2015-07-09 12:19 ` pcase-dolist Thierry Volpiatto
2015-07-09 13:34 ` pcase-dolist Tassilo Horn
2015-07-09 13:40 ` pcase-dolist Thierry Volpiatto
2015-07-09 19:26 ` Stefan Monnier [this message]
2015-07-09 20:27 ` pcase-dolist Michael Heerdegen
2015-07-10 18:51 ` pcase-dolist Stefan Monnier
2015-10-12 11:27 ` pcase-setq (was: pcase-dolist) Michael Heerdegen
2015-10-12 11:54 ` pcase-setq Michael Heerdegen
2015-10-12 12:01 ` pcase-setq (was: pcase-dolist) Nicolas Petton
2015-10-12 12:36 ` pcase-setq Michael Heerdegen
2015-10-12 12:49 ` Semantic of pcase `seq' and `map' patterns (was: pcase-setq) Michael Heerdegen
2015-10-12 13:41 ` Semantic of pcase `seq' and `map' patterns Michael Heerdegen
2015-10-12 13:55 ` Nicolas Petton
2015-10-12 14:02 ` Michael Heerdegen
2015-10-17 12:21 ` Michael Heerdegen
2015-10-17 13:31 ` Nicolas Petton
2015-10-12 13:50 ` Semantic of pcase `seq' and `map' patterns (was: pcase-setq) Nicolas Petton
2015-10-13 0:59 ` pcase-setq Stefan Monnier
2015-10-13 13:52 ` pcase-setq Michael Heerdegen
2015-10-13 14:02 ` pcase-setq Michael Heerdegen
2015-10-13 15:52 ` pcase-setq Michael Heerdegen
[not found] ` <jwvfv1eboo8.fsf-monnier+emacs@gnu.org>
[not found] ` <87d1wh36as.fsf@web.de>
2015-10-14 15:49 ` pcase-setq Stefan Monnier
2015-07-10 14:44 ` pcase-dolist Tassilo Horn
2015-07-10 19:04 ` pcase-dolist Stefan Monnier
2015-07-08 19:44 ` pcase-dolist Artur Malabarba
2015-07-08 20:50 ` pcase-dolist Michael Heerdegen
-- strict thread matches above, loose matches on Subject: below --
2014-07-11 10:35 pcase-dolist Sebastian Wiesner
2014-07-11 13:47 ` pcase-dolist Stefan Monnier
2014-07-11 13:50 ` pcase-dolist Sebastian Wiesner
2014-07-11 14:14 ` pcase-dolist Stefan Monnier
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