GNU bug report logs - #75170
add-to-alist: new function

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From: Stefan Kangas <stefankangas <at> gmail.com>
To: "Alfred M. Szmidt" <ams <at> gnu.org>, Robert Pluim <rpluim <at> gmail.com>
Cc: acorallo <at> gnu.org, eliz <at> gnu.org, 75170 <at> debbugs.gnu.org, winkler <at> gnu.org, monnier <at> gnu.org
Subject: bug#75170: add-to-alist: new function
Date: Tue, 21 Jan 2025 03:12:43 -0600

"Alfred M. Szmidt" <ams <at> gnu.org> writes:

>    map-put! does not work well with alists that are not 'proper':
>
>        ELISP> (setq x (list 1 '(2 . 3)))
>        (1 (2 . 3))
>
> Why should it work on alists at all?  map-put! assumes a map (where is
> this structure documented? I did not see anything in the Elisp
> manual), not an alist.  Invalid alists will also not work on functions
> that assume alists.

According to M-x describe-package RET map RET:

map.el provides generic map-manipulation functions that work on
alists, plists, hash-tables, and arrays.  All functions are
prefixed with "map-".

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