From: Tassilo Horn <tsdh@gnu.org>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Closures - do you understand them well?
Date: Fri, 09 Dec 2022 21:55:49 +0100 [thread overview]
Message-ID: <87ilike1l8.fsf@gnu.org> (raw)
In-Reply-To: <87k030tlfh.fsf@web.de>
Michael Heerdegen <michael_heerdegen@web.de> writes:
> everyone): how to "fix" the code so that what some people expected is
> the end result?...:
>
> Write an expression that returns a list of 100 functions accepting zero
> arguments. `funcall'ing the Nth function must return N. Use a `while'
> loop or whatever you like but please not `dolist' or any tool that
> already handles this "problem" specifically.
This time I'm prepared and have three versions making a new binding.
Take this, Michael! :-)
--8<---------------cut here---------------start------------->8---
(let ((i 0)
(m (lambda (i)
(lambda () i)))
funs)
(while (< i 100)
(push (funcall m i) funs)
(cl-incf i))
(mapcar #'funcall funs))
(let ((i 0)
funs)
(while (< i 100)
(let ((j i))
(push (lambda () j) funs))
(cl-incf i))
(mapcar #'funcall funs))
(let ((i 0)
funs)
(while (< i 100)
(push `(lambda () ,i) funs)
(cl-incf i))
(mapcar #'funcall funs))
--8<---------------cut here---------------end--------------->8---
Oh, I forgot to `nreverse` funs so my Nth function returns 99-N instead.
Good enough...
Bye,
Tassilo
next prev parent reply other threads:[~2022-12-09 20:55 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-08 15:36 Closures - do you understand them well? Michael Heerdegen
2022-12-08 16:24 ` [External] : " Drew Adams
2022-12-08 17:30 ` Michael Heerdegen
2022-12-08 17:56 ` Drew Adams
2022-12-08 18:00 ` Drew Adams
2022-12-08 18:49 ` Michael Heerdegen
2022-12-08 19:35 ` Drew Adams
2022-12-10 4:51 ` Emanuel Berg
2022-12-08 19:45 ` Drew Adams
2022-12-08 19:06 ` Tassilo Horn
2022-12-08 19:53 ` Michael Heerdegen
2022-12-08 20:01 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-08 20:49 ` Michael Heerdegen
2022-12-08 22:00 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-08 22:25 ` [External] : " Drew Adams
2022-12-08 22:51 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-10 2:34 ` Emanuel Berg
2022-12-09 5:03 ` Tomas Hlavaty
2022-12-10 2:35 ` Emanuel Berg
2022-12-10 2:29 ` Emanuel Berg
2022-12-10 16:56 ` Drew Adams
2022-12-15 8:25 ` Emanuel Berg
2022-12-09 4:49 ` tomas
2022-12-09 19:40 ` Michael Heerdegen
2022-12-09 19:50 ` tomas
2022-12-09 20:55 ` Tassilo Horn [this message]
2022-12-09 21:21 ` Michael Heerdegen
2022-12-09 21:31 ` Emanuel Berg
2022-12-09 21:23 ` Emanuel Berg
2022-12-10 11:40 ` tomas
2022-12-12 1:18 ` Michael Heerdegen
2022-12-12 5:16 ` tomas
2022-12-12 6:09 ` Michael Heerdegen
2023-01-18 12:13 ` Emanuel Berg
2023-01-19 13:21 ` Michael Heerdegen
2023-01-27 20:24 ` Emanuel Berg
2023-01-28 0:44 ` Michael Heerdegen
2023-02-26 12:45 ` Emanuel Berg
2023-02-27 8:33 ` tomas
2023-02-28 10:13 ` Michael Heerdegen
2023-03-01 20:42 ` Emanuel Berg
2023-03-03 12:09 ` Michael Heerdegen
2023-03-02 11:08 ` Michael Heerdegen
2023-03-02 18:25 ` Emanuel Berg
2023-03-02 20:48 ` Emanuel Berg
2023-03-03 6:56 ` Eli Zaretskii
2023-03-03 12:19 ` Michael Heerdegen
2023-03-02 18:37 ` Emanuel Berg
2023-03-02 18:50 ` Emanuel Berg
2023-01-18 12:11 ` Emanuel Berg
2022-12-22 4:00 ` Emanuel Berg
2022-12-23 6:27 ` tomas
2023-01-18 12:23 ` Emanuel Berg
2022-12-10 4:46 ` Emanuel Berg
2022-12-10 0:12 ` Michael Heerdegen
2022-12-10 9:34 ` Tassilo Horn
2022-12-10 10:02 ` Emanuel Berg
2022-12-10 16:28 ` Mutation - do you understand it really? (was: Closures - do you understand them well?) Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-10 18:29 ` Mutation - do you understand it really? Michael Heerdegen
2023-01-18 10:58 ` Emanuel Berg
2023-01-19 13:59 ` Michael Heerdegen
2023-01-19 17:47 ` [External] : " Drew Adams
2022-12-11 2:24 ` Closures - do you understand them well? Michael Heerdegen
2022-12-11 9:13 ` Tassilo Horn
2022-12-10 2:26 ` Emanuel Berg
2022-12-10 17:20 ` [External] : " Drew Adams
2022-12-10 18:02 ` Iteration macros (was: [External] : Re: Closures - do you understand them well?) Stefan Monnier via Users list for the GNU Emacs text editor
2022-12-10 20:38 ` Drew Adams
2023-01-18 11:10 ` Emanuel Berg
2023-01-18 11:08 ` Emanuel Berg
2022-12-21 23:53 ` [External] : Re: Closures - do you understand them well? Emanuel Berg
2022-12-09 3:43 ` Emanuel Berg
2022-12-09 4:01 ` Michael Heerdegen
2022-12-09 4:38 ` tomas
2022-12-09 5:37 ` Emanuel Berg
2022-12-09 16:55 ` Michael Heerdegen
2022-12-10 4:52 ` Emanuel Berg
2022-12-08 19:44 ` Eric Abrahamsen
2022-12-08 20:11 ` Emanuel Berg
2022-12-08 20:53 ` Michael Heerdegen
2022-12-08 23:25 ` Michael Heerdegen
2022-12-09 16:50 ` Eric Abrahamsen
2022-12-09 18:48 ` Emanuel Berg
2022-12-09 19:25 ` Michael Heerdegen
2022-12-11 18:42 ` Eric Abrahamsen
2023-01-18 12:08 ` Emanuel Berg
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