From: Tak Kunihiro <tkk@misasa.okayama-u.ac.jp>
To: larsi@gnus.org
Cc: thievol@posteo.net, tkk@misasa.okayama-u.ac.jp,
50928@debbugs.gnu.org, dgutov@yandex.ru
Subject: bug#50928: remove-dups
Date: Tue, 05 Oct 2021 12:03:11 +0900 (JST) [thread overview]
Message-ID: <20211005.120311.942205288614694192.tkk@misasa.okayama-u.ac.jp> (raw)
In-Reply-To: <878rz9p28p.fsf@gnus.org>
>> Now I can find its existence in (info
>> "(elisp) Sequence Functions"). I wonder how I could have reached to
>> the function by myself.
>>
>> How did you find it? (apropos-documentation "duplicate")?
>
> I just... knew about seq.el. The cross-referencing between the older
> sequence functions and seq.el is rather lacking -- basically all these
> older functions should probably reference something in seq.el in their
> doc strings.
How about something like below?
commit xxx
Author: yyy
Date: zzz
Add references to a newer function `seq-uniq' in seq.el
* lisp/subr.el (delete-dups):
* doc/lispref/lists.texi (Sets And Lists):
* doc/lispref/lists.texi (delete-dups): Refer to `seq-uniq' (bug#50928).
diff --git a/lisp/subr.el b/lisp/subr.el
index e4819c4b2b..228d2e0c22 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -696,7 +696,7 @@ delete-dups
"Destructively remove `equal' duplicates from LIST.
Store the result in LIST and return it. LIST must be a proper list.
Of several `equal' occurrences of an element in LIST, the first
-one is kept."
+one is kept. See `seq-uniq' for non-destructive operation."
(let ((l (length list)))
(if (> l 100)
(let ((hash (make-hash-table :test #'equal :size l))
diff --git a/doc/lispref/lists.texi b/doc/lispref/lists.texi
index 75641256b6..66c556ecd0 100644
--- a/doc/lispref/lists.texi
+++ b/doc/lispref/lists.texi
@@ -1227,13 +1227,13 @@ Sets And Lists
@cindex lists as sets
@cindex sets
- A list can represent an unordered mathematical set---simply consider a
-value an element of a set if it appears in the list, and ignore the
-order of the list. To form the union of two sets, use @code{append} (as
-long as you don't mind having duplicate elements). You can remove
-@code{equal} duplicates using @code{delete-dups}. Other useful
-functions for sets include @code{memq} and @code{delq}, and their
-@code{equal} versions, @code{member} and @code{delete}.
+ A list can represent an unordered mathematical set---simply consider
+a value an element of a set if it appears in the list, and ignore the
+order of the list. To form the union of two sets, use @code{append}
+(as long as you don't mind having duplicate elements). You can remove
+@code{equal} duplicates using @code{delete-dups} or @code{seq-uniq}.
+Other useful functions for sets include @code{memq} and @code{delq},
+and their @code{equal} versions, @code{member} and @code{delete}.
@cindex CL note---lack @code{union}, @code{intersection}
@quotation
@@ -1489,7 +1489,8 @@ Sets And Lists
This function destructively removes all @code{equal} duplicates from
@var{list}, stores the result in @var{list} and returns it. Of
several @code{equal} occurrences of an element in @var{list},
-@code{delete-dups} keeps the first one.
+@code{delete-dups} keeps the first one. See @code{seq-uniq} for
+non-destructive operation.
@end defun
See also the function @code{add-to-list}, in @ref{List Variables},
next prev parent reply other threads:[~2021-10-05 3:03 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 3:23 bug#50928: remove-dups Tak Kunihiro
2021-10-01 12:45 ` Lars Ingebrigtsen
2021-10-01 13:16 ` Dmitry Gutov
2021-10-01 17:02 ` bug#50928: [External] : " Drew Adams
2021-10-01 17:31 ` Thierry Volpiatto
2021-10-03 23:42 ` Tak Kunihiro
2021-10-04 9:29 ` Lars Ingebrigtsen
2021-10-05 3:03 ` Tak Kunihiro [this message]
2021-10-05 7:11 ` Lars Ingebrigtsen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211005.120311.942205288614694192.tkk@misasa.okayama-u.ac.jp \
--to=tkk@misasa.okayama-u.ac.jp \
--cc=50928@debbugs.gnu.org \
--cc=dgutov@yandex.ru \
--cc=larsi@gnus.org \
--cc=thievol@posteo.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this external index
https://git.savannah.gnu.org/cgit/emacs.git
https://git.savannah.gnu.org/cgit/emacs/org-mode.git
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.