From: Emanuel Berg <embe8573@student.uu.se>
To: help-gnu-emacs@gnu.org
Subject: Re: no empty (zero) string predicate in Elisp
Date: Sun, 26 Apr 2015 14:36:01 +0200 [thread overview]
Message-ID: <87wq0zkqxa.fsf@debian.uxu> (raw)
In-Reply-To: mailman.1591.1429968677.904.help-gnu-emacs@gnu.org
Stefan Monnier <monnier@iro.umontreal.ca> writes:
> I do wonder, why you'd rather write (empty-string-p
> foo) instead of (equal "" foo) or (string= "" foo)
> ... It's longer
I don't mind typing. It is one of my favorite
activities (in very stiff competition), especially
when it only involves common words with chars that are
close and super-fast to type: 'empty-string-p' is
definitely more pleasant to type (and read) than
'string= ""' whereas 'equal ""' should be about
"equally" pleasant to type, but still less so to read.
> slower
If that is true, which I suppose it is because it
requires an extra function call, the difference should
be close to infinitely small. I don't consider such
quantities. Actually, I don't consider speed at all
when I write Elisp. (But I never did any one big
project that could gain from optimization, either.
Still, I don't think I write slow code, in general.)
When I told the other guy the other day that
(make-string 10 ? ) is better than `dotimes' and
(insert " ") 10 times, there I focus on the code
rather than the speed - but those two (?) ways of
thinking should work to each other's advantage
most often.
> not higher-level either
I don't know the scientific definition of "high-level"
- or how it applies to these three Elisp functions.
The reason I want a binary operator is that it is more
intuitive: it refects my way of thinking - "is the
string empty?" vs. "is the string equal to another
string that is empty?" - also, because a binary
operator reduces the number of data items in the code
(with one, the empty string).
In general, I don't want the same function to be
spelled out over and over to do the same thing -
instead, I want it factored out, named, and invoked
with a "minimal", that is, sufficient, interface.
--
underground experts united
http://user.it.uu.se/~embe8573
next prev parent reply other threads:[~2015-04-26 12:36 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 3:44 no empty (zero) string predicate in Elisp Emanuel Berg
2015-04-25 9:26 ` Nicolas Petton
2015-05-16 9:23 ` Nicolas Petton
2015-05-16 13:22 ` Bozhidar Batsov
2015-05-16 13:28 ` Bozhidar Batsov
2015-05-16 13:36 ` Bozhidar Batsov
2015-05-16 13:46 ` Eli Zaretskii
2015-05-16 16:17 ` Bozhidar Batsov
2015-05-16 13:43 ` Stefan Monnier
2015-05-16 15:27 ` Drew Adams
[not found] ` <mailman.1583.1429954907.904.help-gnu-emacs@gnu.org>
2015-04-25 11:22 ` Emanuel Berg
2015-04-25 13:30 ` Stefan Monnier
[not found] ` <mailman.1591.1429968677.904.help-gnu-emacs@gnu.org>
2015-04-25 14:48 ` Pascal J. Bourguignon
2015-04-26 2:52 ` Stefan Monnier
2015-04-27 10:28 ` zerop: compiler macro vs defsubst (was: no empty (zero) string predicate in Elisp) Nicolas Richard
2015-04-27 12:19 ` zerop: compiler macro vs defsubst Stefan Monnier
[not found] ` <mailman.1626.1430016741.904.help-gnu-emacs@gnu.org>
2015-04-26 4:06 ` no empty (zero) string predicate in Elisp Pascal J. Bourguignon
2015-04-26 21:25 ` Stefan Monnier
2015-04-26 4:26 ` Rusi
2015-04-26 12:36 ` Emanuel Berg [this message]
2015-04-26 15:03 ` Pascal J. Bourguignon
2015-04-26 18:34 ` Emanuel Berg
2015-04-26 18:59 ` Marcin Borkowski
[not found] ` <mailman.1658.1430074770.904.help-gnu-emacs@gnu.org>
2015-04-26 19:06 ` Emanuel Berg
2015-04-26 20:11 ` Marcin Borkowski
[not found] ` <mailman.1662.1430079142.904.help-gnu-emacs@gnu.org>
2015-04-27 1:00 ` Emanuel Berg
2015-04-26 17:28 ` Rusi
2015-04-26 18:39 ` Emanuel Berg
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