From: Hongyi Zhao <hongyi.zhao@gmail.com>
To: Emanuel Berg <moasenwood@zoho.eu>,
help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: append, push, and add-to-list.
Date: Mon, 5 Jul 2021 13:07:56 +0800 [thread overview]
Message-ID: <CAGP6POKCvmP8Jvz699mRaEbUhb4CdgMDSfeNTHO_bgjP7xgBcA@mail.gmail.com> (raw)
In-Reply-To: <878s2lidp1.fsf@zoho.eu>
On Mon, Jul 5, 2021 at 12:32 PM Emanuel Berg via Users list for the
GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
>
> >> Does the following append `el' to `lst'?
> >>
> >> (setq lst `(,@lst el))
> >
> > Yes, literally, but maybe it makes more sense if that is
> > evaluated as well?
> >
> > (defvar lst)
> > (setq lst '(a b c))
> >
> > (defvar el)
> > (setq el 4)
> >
> > (setq lst `(,@lst ,el))
> >
> > Now "lst" will be (a b c 4)
>
> (setq lst '(a b))
> (setq lst `(,@lst logic) ; (a b logic)
>
You have a typo here, should be the following:
((setq lst `(,@lst logic))
Wonderful examples, but how to eval multiple line lisp codes in
scratch buffer? I only know with twice hitting of `C-j' for this job,
as shown below:
(setq lst '(a b)) <--- C-j
(a b)
((setq lst `(,@lst logic)) <-- C-j
(a b logic)
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:[~2021-07-05 5:07 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
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 [this message]
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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