From: phillip.lord@newcastle.ac.uk (Phillip Lord)
To: "Andreas Röhler" <andreas.roehler@easy-emacs.de>
Cc: "help-gnu-emacs@gnu.org List" <help-gnu-emacs@gnu.org>
Subject: Re: DynamicBindingVsLexicalBinding
Date: Mon, 14 Oct 2013 12:15:03 +0100 [thread overview]
Message-ID: <87y55w85oo.fsf@zerg32.ncl.ac.uk> (raw)
In-Reply-To: <52598D4A.2010901@easy-emacs.de> ("Andreas \=\?utf-8\?Q\?R\=C3\=B6h\?\= \=\?utf-8\?Q\?ler\=22's\?\= message of "Sat, 12 Oct 2013 19:56:26 +0200")
Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
> in article
>
> http://www.emacswiki.org/emacs/DynamicBindingVsLexicalBinding
>
> it's said WRT lexical binding
>
> "Because it's (1) much easier for the user [that is, programmer], because
> it eliminates the problem of which variables lambda-expressions use
> (when they attempt to use variables from their surrounding context)"
>
> Unfortunately couldn't find a use-case where it is easier - while consenting it might be easier for the compiler to swallow.
>
> Could someone give an example, where lexical binding makes coding easier?
The point is that you can determine, by reading the code, where the
value of a variable could be changed. You cannot do this with dynamic
binding, because it depends on the execution path.
As a second point, lexical scoping gives you closures which are nice.
Interesting, although lexical binding is pretty much standard now,
exceptions have the same problems (and benefits) as dynamic binding; you
cannot tell where an exception will be handled by looking at the code.
Phil
next prev parent reply other threads:[~2013-10-14 11:15 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-12 17:56 DynamicBindingVsLexicalBinding Andreas Röhler
2013-10-12 18:35 ` DynamicBindingVsLexicalBinding Dmitry Gutov
2013-10-12 20:53 ` DynamicBindingVsLexicalBinding Drew Adams
2013-10-13 5:09 ` DynamicBindingVsLexicalBinding Thien-Thi Nguyen
2013-10-13 7:54 ` DynamicBindingVsLexicalBinding Andreas Röhler
2013-10-13 13:46 ` DynamicBindingVsLexicalBinding Kai Großjohann
2013-10-13 16:21 ` DynamicBindingVsLexicalBinding Drew Adams
2013-10-14 11:21 ` DynamicBindingVsLexicalBinding Phillip Lord
2013-10-14 13:45 ` DynamicBindingVsLexicalBinding Drew Adams
2013-10-14 16:05 ` DynamicBindingVsLexicalBinding Phillip Lord
2013-10-14 21:32 ` DynamicBindingVsLexicalBinding Kai Großjohann
2013-10-15 11:27 ` DynamicBindingVsLexicalBinding Phillip Lord
2013-10-15 20:43 ` DynamicBindingVsLexicalBinding Kai Großjohann
2013-10-16 12:57 ` DynamicBindingVsLexicalBinding Phillip Lord
[not found] ` <mailman.4127.1381928277.10748.help-gnu-emacs@gnu.org>
2013-10-16 14:26 ` DynamicBindingVsLexicalBinding Barry Margolin
[not found] ` <mailman.3929.1381681317.10748.help-gnu-emacs@gnu.org>
2013-10-14 11:27 ` DynamicBindingVsLexicalBinding Rustom Mody
2013-10-14 11:15 ` Phillip Lord [this message]
[not found] <mailman.3891.1381600459.10748.help-gnu-emacs@gnu.org>
2013-10-13 3:34 ` DynamicBindingVsLexicalBinding Barry Margolin
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