From: Louis-Guillaume Gagnon <gagnonlg@protonmail.com>
To: help-gnu-emacs@gnu.org
Subject: Question about let binding behavior
Date: Tue, 08 Oct 2024 06:21:03 +0000 [thread overview]
Message-ID: <88c7526c-b7d9-46f8-8799-5825b97d20ba@protonmail.com> (raw)
Dear all,
I'm a long time user but I've only recently started to dive into elisp
programming. I'm a bit surprised by the following behavior.
Let's say I write the following silly function:
(defun foo (bar)
(let ((baz '((quux . 0) (quuz . 0))))
(if (> 10 bar)
(setcdr (assoc 'quux baz) bar)
(setcdr (assoc 'quuz baz) bar))
baz))
Then the following evals:
(foo 1)
=> ((quux . 1) (quuz . 0))
(foo 100)
=> ((quux . 1) (quuz . 100))
I'm surprised that the list is not reset since I thought the binding was
local to the function, but clearly I don't have the right mental model
for elisp evaluation. For the actual application I ended up using
copy-tree but I'd like to understand this better -- could someone
explain or point out the relevant sections of the manual?
Cheers,
L-G
P.S. Please keep me in CC, I'm not subscribed to this list
next reply other threads:[~2024-10-08 6:21 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-08 6:21 Louis-Guillaume Gagnon [this message]
2024-10-08 6:41 ` Question about let binding behavior tomas
2024-10-08 7:49 ` Louis-Guillaume Gagnon
2024-10-08 8:05 ` tomas
2024-10-08 16:02 ` tomas
2024-10-09 8:01 ` Louis-Guillaume Gagnon via Users list for the GNU Emacs text editor
2024-10-09 8:13 ` Tomas Hlavaty
2024-10-09 23:39 ` Stefan Monnier via Users list for the GNU Emacs text editor
2024-10-10 7:58 ` Tomas Hlavaty
2024-10-10 18:38 ` Stefan Monnier via Users list for the GNU Emacs text editor
2024-10-18 11:25 ` Rudolf Schlatte
2024-10-08 8:15 ` Joost Kremers
2024-10-08 22:27 ` Michael Heerdegen via Users list for the GNU Emacs text editor
2024-10-08 22:21 ` Michael Heerdegen via Users list for the GNU Emacs text editor
2024-10-08 15:47 ` [External] : " Drew Adams
2024-10-09 2:28 ` Stefan Monnier via Users list for the GNU Emacs text editor
-- strict thread matches above, loose matches on Subject: below --
2024-10-09 8:34 Louis-Guillaume Gagnon via Users list for the GNU Emacs text editor
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