[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Is there already an alist function which gets all matching elements,
From: |
Alan Mackenzie |
Subject: |
Re: Is there already an alist function which gets all matching elements, not just the first? |
Date: |
Thu, 6 Oct 2022 18:24:29 +0000 |
Hello, Robert.
On Wed, Oct 05, 2022 at 12:45:00 +0200, Robert Pluim wrote:
> >>>>> 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))))
Thanks for the idea! But I'd have to copy the alist first, and then it
starts to look a bit contrived.
Maybe I should just write a straightforward loop to get this info.
> Robert
> --
--
Alan Mackenzie (Nuremberg, Germany).