Re: append, push, and add-to-list.

[Emanuel Berg]

Hongyi Zhao wrote:

> On Mon, Jul 5, 2021 at 12:19 AM Emanuel Berg via Users list for the
> GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
>
>>
>> Hongyi Zhao wrote:
>>
>> > I've noticed there are some similar functions, i.e., append,
>> > push, and add-to-list, for revising/updating the content of
>> > a list. But I'm still not so clear on the specific use
>> > scenarios for them. Consider the following command [1]
>>
>> `nconc', `cl-pushnew', (setq lst `(,@lst el)) ...
>
> 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)

> This is one of the reasons that baffles me the most - there
> are so many functions in Emacs.

The more the merrier...

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