From: Michael Heerdegen <michael_heerdegen@web.de>
To: Emacs Development <emacs-devel@gnu.org>
Subject: pcase-dolist
Date: Wed, 08 Jul 2015 14:20:40 +0200 [thread overview]
Message-ID: <87wpyaet7r.fsf@web.de> (raw)
Hello,
I was recently bitten by unexpected behavior of `pcase-dolist'.
Like `pcase-let' (which is used internally by `pcase-dolist'), AFAICT it
assumes that the pattern always matches, e.g.
(pcase-dolist ((and x (pred < 0)) '(-1 0 1 2))
(message "%s" x))
prints all members of the sequence.
Apart from the question whether this semantic is useful: with the
current semantic, a name that includes "case" is irritating considering
such a behavior. Maybe "pdolist" (and "plet", "plet*") would be better
names?
Anyway, an idea that came to my mind more than once: `when-let',
`if-let' should really be `pcase-when-let' , `pcase-if-let'. They would
be much more useful than the plain versions I think.
Then `pcase-dolist' could be reimplemented using `pcase-when-let'.
Michael.
next reply other threads:[~2015-07-08 12:20 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 12:20 Michael Heerdegen [this message]
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 ` pcase-dolist Stefan Monnier
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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