From: daanturo <daanturo@gmail.com>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: 49316@debbugs.gnu.org
Subject: bug#49316: Add apply-partially's right version
Date: Sat, 3 Jul 2021 13:17:50 +0700 [thread overview]
Message-ID: <1aaac06c-da6d-0f60-3fab-937207ad527c@gmail.com> (raw)
In-Reply-To: <875yxsxfit.fsf@web.de>
That's cool! Can you submit the patch?
On 7/3/21 10:06 AM, Michael Heerdegen wrote:
> A placeholder (e.g. the symbol `_' which should normally be unbound)
> stands for an argument that is used from the args provided in the actual
> call:
>
> #+begin_src emacs-lisp
> (defmacro applying-partially (call)
> (let ((args (make-symbol "args")))
> `(lambda (&rest ,args)
> (apply #',(car call)
> ,@(mapcar (lambda (arg)
> (if (eq arg '_)
> `(pop ,args)
> arg))
> (cdr call))
> ,args))))
>
> (defalias 'minus-10 (applying-partially (- _ 10)))
>
> (minus-10 120) ;; ==> 110
>
> (defalias 'my-list-with-some-elts
> (applying-partially (list 0 _ 2 _ 4)))
>
> (my-list-with-some-elts 'a 'b 'c 'd) ; => (0 a 2 b 4 c d)
>
> (symbol-function 'my-list-with-some-elts)
> ;; => (closure (t) (&rest args)
> ;; (apply #'list 0 (pop args) 2 (pop args) 4 args))
> #+end_src
>
> --
> Daanturo.
next prev parent reply other threads:[~2021-07-03 6:17 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-01 12:40 bug#49316: Add apply-partially's right version daanturo
2021-07-01 13:11 ` Basil L. Contovounesios
2021-07-01 16:24 ` daanturo
2021-07-01 17:06 ` daanturo
2021-07-01 17:16 ` daanturo
2021-07-01 18:45 ` Eli Zaretskii
2021-07-02 2:49 ` daanturo
2021-07-03 7:03 ` Eli Zaretskii
2021-10-24 6:55 ` Stefan Kangas
2021-10-24 10:49 ` daanturo
2021-10-24 11:18 ` Stefan Kangas
2021-10-24 12:13 ` Eli Zaretskii
2021-10-24 13:47 ` Lars Ingebrigtsen
2021-10-24 14:10 ` Stefan Kangas
2021-10-24 14:28 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-10-25 12:50 ` Lars Ingebrigtsen
2021-10-24 13:38 ` Lars Ingebrigtsen
2021-07-02 16:32 ` daanturo
2021-07-03 7:03 ` Eli Zaretskii
2021-07-01 22:34 ` Michael Heerdegen
2021-07-02 4:39 ` daanturo
2021-07-03 3:06 ` Michael Heerdegen
2021-07-03 6:17 ` daanturo [this message]
2021-07-03 14:13 ` Phil Sainty
2021-07-05 4:29 ` daanturo
2021-07-05 12:02 ` Phil Sainty
2021-07-06 4:33 ` Michael Heerdegen
2021-07-07 16:30 ` daanturo
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