GNU bug report logs - #58278
Add new function seq-keep

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Package: emacs;

Reported by: Jonas Bernoulli <jonas <at> bernoul.li>

Date: Mon, 3 Oct 2022 21:31:02 UTC

Severity: normal

Fixed in version 29.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Jonas Bernoulli <jonas <at> bernoul.li>
To: bug-gnu-emacs <at> gnu.org
Subject: Add new function seq-keep
Date: Mon, 03 Oct 2022 23:30:13 +0200

While I still appreciate the `dash' package, I try to avoid it in
a package when all or most of its used `dash' functions and macros,
can be replaced with equivalent functions/macros from `seq', `cl-lib'
or other parts of Emacs.

Unfortunately I cannot find a replacement for `-keep', which I have been
using a lot.  I propose that we add something like:

  (cl-defgeneric seq-keep (pred sequence)
    "Return a list of all non-nil results of (PRED element) for elements in SEQUENCE."
    (delq nil (seq-map (lambda (elt) (funcall pred elt))
                       sequence)))

Cheers,
Jonas
This bug report was last modified 2 years and 217 days ago.

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