From: Yuri Khan <yurivkhan@gmail.com>
To: brandelune@gmail.com
Cc: help-gnu-emacs <help-gnu-emacs@gnu.org>
Subject: Re: local binding, too local...
Date: Sat, 8 Dec 2018 13:48:03 +0700 [thread overview]
Message-ID: <CAP_d_8WGbi1JcMy8Bp-1QEsRZnj4h12C-p5xAMzDC2_fUvQzHA@mail.gmail.com> (raw)
In-Reply-To: <0583DE39-42E2-4D05-97F6-3D709DBC73FE@gmail.com>
On Sat, Dec 8, 2018 at 9:19 AM Jean-Christophe Helary
<brandelune@gmail.com> wrote:
> In a defun I wrote I have a let* block that does something, then some setf code, then a let block that does something on the values created by setf, but the let block needs a value that it set in the let* block.
The customary way is to put the consumer block within the producer block:
(defun foo ()
(let* ((bar '(baz quux)))
(setf (car bar) 'xyzzy)
(let ((plugh (cdr bar)))
(message "%s" plugh))))
> I would like to keep things local, but not *that* local, just *defun* local.
>
> Is there a clean way to declare variables local to a defun and without being locked by let\*? blocks ?
let and let* are *binding* forms, not *assignment* statements. The
bindings go in scope, the body is executed, the bindings go out of
scope.
setq, on the other hand, is an assignment form. If a named variable
exists in the current scope, it will reset its value.
However, the longer a variable is and the broader its scope is, the
more difficult it is to track where and how it it modified.
next prev parent reply other threads:[~2018-12-08 6:48 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-08 2:18 local binding, too local Jean-Christophe Helary
2018-12-08 6:07 ` Drew Adams
2018-12-08 7:39 ` Jean-Christophe Helary
2018-12-08 6:48 ` Yuri Khan [this message]
2018-12-08 7:37 ` Jean-Christophe Helary
2018-12-08 8:02 ` tomas
2018-12-08 14:45 ` Jean-Christophe Helary
2018-12-08 21:59 ` tomas
2018-12-09 2:41 ` Jean-Christophe Helary
2018-12-09 8:45 ` tomas
2018-12-09 9:55 ` Jean-Christophe Helary
[not found] ` <mailman.5363.1544251700.1284.help-gnu-emacs@gnu.org>
2018-12-08 9:33 ` Rusi
2018-12-08 16:41 ` Stefan Monnier
[not found] ` <mailman.5389.1544287285.1284.help-gnu-emacs@gnu.org>
2018-12-08 19:13 ` Barry Fishman
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