From: Hongyi Zhao <hongyi.zhao@gmail.com>
To: Hongyi Zhao <hongyi.zhao@gmail.com>,
help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: append, push, and add-to-list.
Date: Sun, 4 Jul 2021 21:50:39 +0800 [thread overview]
Message-ID: <CAGP6PO+wuCFyatdEbPcuy7gLxJVcWoz9JoTRbQwviTwf_6wJOQ@mail.gmail.com> (raw)
In-Reply-To: <YOGbWPme9pU7Z6Ox@protected.localdomain>
On Sun, Jul 4, 2021 at 7:32 PM Jean Louis <bugs@gnu.support> wrote:
>
> * Hongyi Zhao <hongyi.zhao@gmail.com> [2021-07-04 08:12]:
> > Thank you. I listed the usages below for all above-mentioned functions
> > by {C-h f} function-name:
> >
> > (add-to-list LIST-VAR ELEMENT &optional APPEND COMPARE-FN)
> > (push NEWELT PLACE)
> > (cl-pushnew X PLACE [KEYWORD VALUE]...)
> > (append &rest SEQUENCES)
>
> Good, I can also see some possible inconsistencies with X and NEWELT,
> as it would be better to call X also NEWELT. I can also see that
> documentation for `cl-pushnew' is not adequate enough. You are
> probably expected to learn definition from Common Lisp to understand
> the KEYWORDs:
> http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/HyperSpec/Body/mac_pushnew.html#pushnew
>
> Function `append' will work with various sequences not just lists.
>
> Please see manual: (info "(elisp) Sequences Arrays Vectors")
>
> > > Because you use it more for configurations, then add-to-list would be:
> > >
> > > (add-to-list 'company-backends '(company-capf company-ispell))
> >
> > Why can't this be written as follows, just like the other two?
> >
> > (add-to-list company-backends '(company-capf company-ispell))
> >
> > >
> > > and with append
> > >
> > > (append company-backends '(company-capf company-ispell))
>
> Functions `add-to-list' and `append' do different things, though
> similar.
>
I'm curious why `add-to-list' must take 'company-backends, i.e.,
(quote company-backends) as one of its argument, while the other
functions can directly use the unquoted form.
HY
--
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
NO. 552 North Gangtie Road, Xingtai, China
next prev parent reply other threads:[~2021-07-04 13:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-04 3:18 append, push, and add-to-list Hongyi Zhao
2021-07-04 4:35 ` Jean Louis
2021-07-04 5:11 ` Hongyi Zhao
2021-07-04 11:28 ` Jean Louis
2021-07-04 13:50 ` Hongyi Zhao [this message]
2021-07-04 15:58 ` Jean Louis
2021-07-05 2:04 ` Hongyi Zhao
2021-07-04 16:01 ` [External] : " Drew Adams
2021-07-04 16:20 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-04 16:19 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 2:16 ` Hongyi Zhao
2021-07-05 3:48 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 4:31 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 5:07 ` Hongyi Zhao
2021-07-05 5:50 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 6:19 ` Hongyi Zhao
2021-07-05 5:06 ` Jean Louis
2021-07-05 6:22 ` Hongyi Zhao
2021-07-05 6:32 ` Emanuel Berg via Users list for the GNU Emacs text editor
-- strict thread matches above, loose matches on Subject: below --
2021-07-05 14:37 Drew Adams
2021-07-05 14:53 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 15:19 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-07-05 16:46 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-06 19:54 ` Jean Louis
2021-07-06 20:08 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 15:41 ` tomas
2021-07-05 16:58 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 17:21 ` tomas
2021-07-06 1:17 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 18:10 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 18:18 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 18:11 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-05 18:39 ` Stefan Monnier via Users list for the GNU Emacs text editor
2021-07-05 20:35 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-06 19:57 ` Jean Louis
2021-07-06 20:16 ` Emanuel Berg via Users list for the GNU Emacs text editor
2021-07-06 19:56 ` Jean Louis
2021-07-06 20:15 ` Emanuel Berg via Users list for the GNU Emacs text editor
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