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From: Michael Heerdegen <michael_heerdegen@web.de>
To: help-gnu-emacs@gnu.org
Subject: Re: dynamic and lexical scope, attempted summary with example
Date: Mon, 21 Jul 2014 11:23:30 +0200	[thread overview]
Message-ID: <87egxf9ib1.fsf@web.de> (raw)
In-Reply-To: 87bnsjsorp.fsf_-_@debian.uxu

Emanuel Berg <embe8573@student.uu.se> writes:

> As always, I think it is easier to discuss in terms of
> an example...

Right, but I think in this case, it's not a good idea to learn that in
passing.  I really recommend to read some literature about it - this
isn't trivial.  Both kinds of scope have their rights to exist and their
use cases.

When I first heard about scope, I though "This does only matter in
situations I avoid".  But lexical scope in a functional language
is a basis of lots of advanced programming techniques.  OTOH, dynamic
scope is as well imperative to programming in LISP.

It's explained e.g. here:

    http://www.paulgraham.com/onlisp.html

There are books easier to read than this, but the chapter about scope is
well understandable without reading the rest, I think.




  parent reply	other threads:[~2014-07-21  9:23 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-15 13:47 run-with-timer does not display message Matthias Pfeifer
2014-07-15 13:53 ` Thorsten Jolitz
2014-07-18 16:26   ` Stefan Monnier
     [not found]   ` <mailman.5631.1405701027.1147.help-gnu-emacs@gnu.org>
2014-07-18 21:34     ` Emanuel Berg
2014-07-19 15:09       ` Sebastian Wiesner
2014-07-19 15:27         ` Eli Zaretskii
2014-07-19 17:08           ` Stefan Monnier
2014-07-19 18:04             ` Drew Adams
     [not found]           ` <mailman.5702.1405789759.1147.help-gnu-emacs@gnu.org>
2014-07-19 17:43             ` Emanuel Berg
2014-07-19 18:12               ` Stefan Monnier
2014-07-19 20:06                 ` Lexical and Dynamic Scope Robert Thorpe
2014-07-20 12:15               ` run-with-timer does not display message Sebastian Wiesner
2014-07-21 13:26                 ` Stefan Monnier
     [not found]               ` <mailman.5708.1405793578.1147.help-gnu-emacs@gnu.org>
2014-07-20 19:27                 ` Emanuel Berg
2014-07-21 13:29                   ` Stefan Monnier
     [not found]                   ` <mailman.5813.1405950328.1147.help-gnu-emacs@gnu.org>
2014-07-21 22:17                     ` Emanuel Berg
2014-07-24  8:25                       ` Stefan Monnier
     [not found]               ` <mailman.5754.1405858540.1147.help-gnu-emacs@gnu.org>
2014-07-20 19:37                 ` Emanuel Berg
2014-07-20 20:11                   ` Drew Adams
2014-07-20 21:28                 ` dynamic and lexical scope, attempted summary with example (was: Re: run-with-timer does not display message) Emanuel Berg
2014-07-21  4:44                   ` dynamic and lexical scope, attempted summary with example Thien-Thi Nguyen
2014-07-21  6:36                     ` Thorsten Jolitz
     [not found]                     ` <mailman.5796.1405924598.1147.help-gnu-emacs@gnu.org>
2014-07-21 14:08                       ` Emanuel Berg
2014-07-21  9:23                   ` Michael Heerdegen [this message]
     [not found]                   ` <mailman.5792.1405917701.1147.help-gnu-emacs@gnu.org>
2014-07-21 13:36                     ` Emanuel Berg
2014-07-21 17:07                       ` Thien-Thi Nguyen
     [not found]                       ` <mailman.5826.1405962249.1147.help-gnu-emacs@gnu.org>
2014-07-21 22:11                         ` Emanuel Berg
     [not found]                   ` <mailman.5805.1405934637.1147.help-gnu-emacs@gnu.org>
2014-07-21 14:02                     ` Emanuel Berg
     [not found]       ` <mailman.5686.1405782584.1147.help-gnu-emacs@gnu.org>
2014-07-19 17:49         ` run-with-timer does not display message Emanuel Berg
     [not found] ` <mailman.5455.1405432451.1147.help-gnu-emacs@gnu.org>
2014-07-15 15:35   ` Emanuel Berg

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