Re: Is there already an alist function which gets all matching elements, not just the first?

[Robert Pluim]

>>>>> On Wed, 5 Oct 2022 10:00:10 +0000, Alan Mackenzie <acm@muc.de> said:

    Alan> Hello, Emacs.
    Alan> I want to be able to get all matching elements from an alist (thinking
    Alan> about extending imenu).  Something like

    Alan>     (assoc-all key list)

    Alan> which would return a list of matches.  After all, we have functions
    Alan> which _delete_ all matches from an alist.

    Alan> Does such a function already exist, perhaps in cl-*.el?

Just use assoc-delete-all and invert the test:

(assoc-delete-all mykey myalist (lambda (val key)
                                  (not (eq val key))))

Robert
--