From: Eli Zaretskii <eliz@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: Re: How to count the number of occurrences of a character in a string?
Date: Wed, 14 Oct 2015 20:06:41 +0300 [thread overview]
Message-ID: <834mhtxtum.fsf@gnu.org> (raw)
In-Reply-To: <87mvvlix4r.fsf@gmail.com>
> From: Oleh Krehel <ohwoeowho@gmail.com>
> Date: Wed, 14 Oct 2015 12:04:52 +0200
>
> (defun my-count (char str)
> (let ((count 0)
> (end (length str))
> (i 0)
> x)
> (while (< i end)
> (setq x (aref str i))
> (if (eq char x)
> (setq count (1+ count)))
> (setq i (1+ i)))
> count))
>
> While `my-count' is twice as fast, I'd still recommend to use
> `cl-count', unless the code is very performance-critical.
Why? There's nothing wrong with aref.
next prev parent reply other threads:[~2015-10-14 17:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-12 19:45 How to count the number of occurrences of a character in a string? Marcin Borkowski
2015-10-12 21:43 ` Kaushal Modi
2015-10-12 23:27 ` Nick Dokos
2015-10-13 1:18 ` Stefan Monnier
2015-10-13 16:06 ` Kaushal Modi
2015-10-13 16:31 ` Kaushal Modi
2015-10-13 16:48 ` Eli Zaretskii
2015-10-13 17:41 ` Eli Zaretskii
2015-10-13 17:43 ` Kaushal Modi
2015-10-13 19:07 ` Eli Zaretskii
2015-10-13 19:56 ` Kaushal Modi
2015-10-13 20:17 ` Eli Zaretskii
2015-10-13 20:41 ` Kaushal Modi
[not found] ` <mailman.267.1444767491.7904.help-gnu-emacs@gnu.org>
2015-10-13 20:46 ` Brendan Halpin
2015-10-13 21:07 ` Kaushal Modi
[not found] ` <mailman.273.1444770543.7904.help-gnu-emacs@gnu.org>
2015-10-13 22:44 ` Joost Kremers
2015-10-14 10:04 ` Oleh Krehel
2015-10-14 17:06 ` Eli Zaretskii [this message]
2015-10-13 20:43 ` Michael Heerdegen
2015-10-13 20:59 ` Charles Curley
2015-10-14 18:19 ` Noam Postavsky
2015-10-14 20:00 ` Kaushal Modi
2015-10-13 22:00 ` Emanuel Berg
[not found] <mailman.164.1444679125.7904.help-gnu-emacs@gnu.org>
2015-10-12 23:35 ` Joost Kremers
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