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From: <tomas@tuxteam.de>
To: help-gnu-emacs@gnu.org
Subject: Re: Understanding the "let" construct and the setting of variables
Date: Fri, 18 Dec 2020 10:01:28 +0100	[thread overview]
Message-ID: <20201218090128.GA27014@tuxteam.de> (raw)
In-Reply-To: <87czz8dpsd.fsf@web.de>

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On Thu, Dec 17, 2020 at 11:35:30PM +0100, Michael Heerdegen wrote:
> steve-humphreys@gmx.com writes:
> 
> > I would thing the variable has to be made somewhere.
> > In fact people talk about "unboundp".
> 
> A variable can be unbound.  Would be hard to call `boundp' with a
> variable that doesn't exist.

But then, you don't call `boundp' on variables. You call it on symbols.

AFAIK (but I could be wrong, corrections welcome!) there's no explicit
notion of variable in Emacs Lisp, i.e. you cah't "have" a variable
object and manipulate it directly.

That doesn't mean they don't exist -- I fancy them living in the grey
area between symbols and bindings.

Again, the Elisp manual ("12 Variables" and, linked from there, "9
Symbols") makes for a good reading.

Cheers
 - t

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  reply	other threads:[~2020-12-18  9:01 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-17  0:10 Understanding the "let" construct and the setting of variables steve-humphreys
2020-12-17  0:21 ` Joost Kremers
2020-12-17  2:08   ` steve-humphreys
2020-12-17  3:12     ` steve-humphreys
2020-12-17  8:01       ` Joost Kremers
2020-12-17  8:31         ` steve-humphreys
2020-12-17  8:50           ` Joost Kremers
2020-12-17  8:10     ` Joost Kremers
2020-12-17  8:43       ` steve-humphreys
2020-12-17  8:56         ` Joost Kremers
2020-12-18 20:48           ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-18 20:46         ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-18 21:07           ` Jean Louis
2020-12-18 22:31           ` tomas
2020-12-18 20:39       ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-17  2:49   ` steve-humphreys
2020-12-17  7:58     ` Joost Kremers
2020-12-17 16:55       ` Drew Adams
2020-12-17 20:11         ` steve-humphreys
2020-12-17 21:57           ` Drew Adams
2020-12-17 22:35           ` Michael Heerdegen
2020-12-18  9:01             ` tomas [this message]
2020-12-18  9:16               ` Michael Heerdegen
2020-12-18 20:55                 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-19  2:17                   ` Michael Heerdegen
2020-12-19  2:52                     ` Drew Adams
2020-12-19  5:15                     ` Stefan Monnier
2020-12-18 20:33   ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-17  0:25 ` steve-humphreys
2020-12-17  0:35   ` steve-humphreys
2020-12-17  1:05     ` Joost Kremers
2020-12-17  1:20       ` steve-humphreys
2020-12-18 20:58         ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-17  4:34   ` Jean Louis
2020-12-17  5:12     ` steve-humphreys
2020-12-19  6:06       ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-17  7:31     ` steve-humphreys
2020-12-19  5:55     ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-19  6:49       ` Jean Louis
2020-12-20  5:19         ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-18 17:14   ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-18 17:48     ` tomas
2020-12-18 15:33 ` Emanuel Berg via Users list for the GNU Emacs text editor
2020-12-18 18:12   ` Jean Louis
2020-12-18 18:20     ` Drew Adams
2020-12-18 18:45       ` Jean Louis
2020-12-18 19:16         ` Drew Adams
2020-12-18 20:00           ` Jean Louis
2020-12-18 21:27     ` Christopher Dimech
2020-12-19  6:23     ` Emanuel Berg via Users list for the GNU Emacs text editor

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