From: Dr Rainer Woitok <rainer.woitok@gmail.com>
To: Philip Kaludercic <philipk@posteo.net>
Cc: help-gnu-emacs@gnu.org
Subject: Re: (interactive) and &optional
Date: Sat, 25 Mar 2023 13:35:51 +0100 [thread overview]
Message-ID: <25630.60070.913514.100455@woitok.gmail.com> (raw)
In-Reply-To: Msg <87jzz746ma.fsf@posteo.net> of 2023-03-23 19:20:29 +0000 from philipk@posteo.net
Philip,
On Thursday, 2023-03-23 19:20:29 +0000, you wrote:
> ...
> > as expected, while calling "M-x fun" and then just typing "RET" at the
> > prompt returns
> >
> > val:.\n
> >
> > that is, an empty symbol or string.
>
> Right.
That's a bit flabbergasting: experimenting some more with my function, I
found that "symbolp" really returns t in case of empty responses, mean-
ing there really is such a thing as an empty symbol. So how can I test
for an empty symbol? There doesn't seem to be a function "symbol-empty-
p" while, strictly speaking, "string-empty-p" shouldn't be applyable to
symbols at all, should it? Does an empty symbol have an external repre-
sentation like an empty list or string, allowing the use of "eq"?
Sincerely,
Rainer
next prev parent reply other threads:[~2023-03-25 12:35 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-23 19:10 (interactive) and &optional Dr Rainer Woitok
2023-03-23 19:20 ` Philip Kaludercic
2023-03-25 12:35 ` Dr Rainer Woitok [this message]
2023-03-25 13:12 ` Philip Kaludercic
2023-03-25 14:33 ` [External] : " Drew Adams
2023-03-25 15:36 ` Dr Rainer Woitok
2023-03-25 16:58 ` Philip Kaludercic
2023-03-23 20:01 ` Emanuel Berg
2023-03-24 9:23 ` Jean Louis
2023-03-24 20:52 ` Philip Kaludercic
2023-03-24 21:07 ` Emanuel Berg
2023-03-27 1:52 ` [External] : " Drew Adams
2023-03-27 2:40 ` John Yates
2023-03-24 21:42 ` Jean Louis
2023-03-26 1:04 ` Emanuel Berg
2023-03-30 19:04 ` Jean Louis
2023-03-25 12:05 ` Dr Rainer Woitok
2023-03-25 14:32 ` Jean Louis
2023-03-25 15:41 ` Dr Rainer Woitok
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