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Re: pcase-dolist
From: |
Tassilo Horn |
Subject: |
Re: pcase-dolist |
Date: |
Fri, 10 Jul 2015 16:44:42 +0200 |
User-agent: |
Gnus/5.130014 (Ma Gnus v0.14) Emacs/25.0.50 (gnu/linux) |
Stefan Monnier <address@hidden> writes:
>> 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.
Yes, but those don't have pcase in their name. If that wouldn't be the
case with `pcase-let' I would not complain at all.
Hm, when you said that a better name for `pcase-dolist' was `dolist',
wouldn't `let(*)' be a better name for `pcase-let(*)', too? It would be
very useful to be able to destructure in usual lets (like, e.g., in
Clojure). I think there are gazillion of occurrences of
(let* ((this-and-that (foo ...))
(this (car this-and-that))
(that (cdr this-and-that)))
...)
AFAICS, the only thing that `pcase-let' is lacking is the ability to
introduce locals without providing a value, e.g.,
(let ((x 1) b c) ...)
but that shouldn't be too hard to add, no?
Bye,
Tassilo
- Re: pcase-dolist, (continued)
- Re: pcase-dolist, Stefan Monnier, 2015/07/08
- Re: pcase-dolist, Tassilo Horn, 2015/07/09
- Re: pcase-dolist, Thierry Volpiatto, 2015/07/09
- Re: pcase-dolist, Tassilo Horn, 2015/07/09
- Re: pcase-dolist, Thierry Volpiatto, 2015/07/09
- Re: pcase-dolist, Tassilo Horn, 2015/07/09
- Re: pcase-dolist, Thierry Volpiatto, 2015/07/09
- Re: pcase-dolist, Stefan Monnier, 2015/07/09
- Re: pcase-dolist, Michael Heerdegen, 2015/07/09
- Re: pcase-dolist, Stefan Monnier, 2015/07/10
- Re: pcase-dolist,
Tassilo Horn <=
- Re: pcase-dolist, Stefan Monnier, 2015/07/10
- Re: pcase-dolist, Artur Malabarba, 2015/07/08
- Re: pcase-dolist, Michael Heerdegen, 2015/07/08