From: Richard Stallman <rms@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: john.b.mastro@gmail.com, bozhidar.batsov@gmail.com, emacs-devel@gnu.org
Subject: Re: if-let and when-let: parallel or sequential
Date: Mon, 11 Aug 2014 23:15:27 -0400 [thread overview]
Message-ID: <E1XH2YZ-0001HM-NB@fencepost.gnu.org> (raw)
In-Reply-To: <jwvr40nt7j1.fsf-monnier+emacs@gnu.org> (message from Stefan Monnier on Mon, 11 Aug 2014 10:42:19 -0400)
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> if-let and when-let don t make much sense with more than one binding
> form.
Why do you think so? If they only work for a single binding, the
benefit is really minor. It's only when you use several bindings that
the benefit becomes more significant (the alternative being either
a very deeply nested code, or separating the var's declarations from
their initialization).
With several sequential bindings, the alternative is
(let* ...bindings...
(if ...))
Thus, if-let saves just one level of nesting
even if there are several bindings.
--
Dr Richard Stallman
President, Free Software Foundation
51 Franklin St
Boston MA 02110
USA
www.fsf.org www.gnu.org
Skype: No way! That's nonfree (freedom-denying) software.
Use Ekiga or an ordinary phone call.
next prev parent reply other threads:[~2014-08-12 3:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-10 2:44 if-let and when-let: parallel or sequential John Mastro
2014-08-10 15:22 ` Stefan Monnier
2014-08-11 12:01 ` Bozhidar Batsov
2014-08-11 14:42 ` Stefan Monnier
2014-08-11 16:40 ` Harald Hanche-Olsen
2014-08-11 17:49 ` Bozhidar Batsov
2014-08-11 20:55 ` Harald Hanche-Olsen
2014-08-12 2:43 ` Lars Magne Ingebrigtsen
2014-08-12 3:15 ` Richard Stallman [this message]
2014-08-12 3:30 ` John Mastro
2014-08-12 14:32 ` Elias Mårtenson
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