From: Marcin Borkowski <mbork@wmi.amu.edu.pl>
To: help-gnu-emacs@gnu.org
Subject: Re: Why doesn't nconc change my variable?
Date: Sun, 05 Oct 2014 11:35:35 +0200 [thread overview]
Message-ID: <87wq8eluzc.fsf@wmi.amu.edu.pl> (raw)
In-Reply-To: <87zjdbmg38.fsf@kuiper.lan.informatimago.com>
On 2014-10-05, at 03:59, Pascal J. Bourguignon wrote:
> Marcin Borkowski <mbork@wmi.amu.edu.pl> writes:
>
>> Hi list,
>>
>> I don't get it.
>
> () is actually read as the symbol nil.
> Symbols are symbols, and not cons cells.
> You cannot transform a symbol into a cons cell.
> It is impossible for any function to transform nil into a cons cell.
>
> And vice-versa, it is impossible to transform a cons cell into a symbol
> such as nil. This is the reason why you should also use setf when
> deleting elements from a list:
>
> (setf list (delete e list))
I still don't understand. What if I used (list) to generate an empty
list instead of () or nil? The results seem to be still the same.
Best,
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Adam Mickiewicz University
next prev parent reply other threads:[~2014-10-05 9:35 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.10460.1412473030.1147.help-gnu-emacs@gnu.org>
2014-10-05 1:59 ` Why doesn't nconc change my variable? Pascal J. Bourguignon
2014-10-05 9:35 ` Marcin Borkowski [this message]
[not found] ` <mailman.10474.1412501757.1147.help-gnu-emacs@gnu.org>
2014-10-05 17:50 ` Pascal J. Bourguignon
2014-10-05 18:04 ` Pascal J. Bourguignon
2014-10-05 1:36 Marcin Borkowski
2014-10-05 1:58 ` Drew Adams
2014-10-05 9:54 ` Marcin Borkowski
2014-10-05 10:52 ` Thorsten Jolitz
2014-10-05 16:29 ` Drew Adams
2014-10-05 16:38 ` Drew Adams
[not found] ` <mailman.10475.1412502895.1147.help-gnu-emacs@gnu.org>
2014-10-05 18:12 ` Pascal J. Bourguignon
2014-10-05 18:14 ` Pascal J. Bourguignon
2014-10-05 18:31 ` Pascal J. Bourguignon
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