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bug#50928: remove-dups
From: |
Lars Ingebrigtsen |
Subject: |
bug#50928: remove-dups |
Date: |
Fri, 01 Oct 2021 14:45:39 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) |
Tak Kunihiro <tkk@misasa.okayama-u.ac.jp> writes:
> I wanted to delete duplicated items from a list non-destructively.
> It took me a while to find out how to do so.
>
> (cl-remove-duplicates list :test 'equal)
> (delete-dups (copy-sequence list))
>
> I think it is handy to have something like below in subr.el.
> Too obvious?
>
> #+begin_src emacs-lisp
> (defun remove-dups (list)
> "Remove 'equal' duplicates from LIST non-destructively.
> Note that `delete-dups' deletes duplicates destructively."
> (delete-dups (copy-sequence list)))
> #+end_src
This is basically seq-uniq:
---
seq-uniq is an autoloaded compiled Lisp function in ‘seq.el’.
(seq-uniq SEQUENCE &optional TESTFN)
---
The seq library has a pretty full set of sequence functions, some of
which overlaps with the older functions like `delete-dups'.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#50928: remove-dups,
Lars Ingebrigtsen <=