From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: =?utf-8?Q?Benjam=C3=ADn_Buccianti?= Newsgroups: gmane.emacs.help Subject: Re: count char in string [The Emacs Challenge Competition - round 2, with fallout] Date: Wed, 28 Oct 2020 22:46:42 -0300 Message-ID: <871rhh4xdp.fsf@buccianti.dev> References: <87r1pj41wa.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="6722"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:xniXvvop/8sftde85d/gYxTAMng= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Oct 29 02:47:37 2020 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kXx2P-0001ep-LR for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 29 Oct 2020 02:47:37 +0100 Original-Received: from localhost ([::1]:42696 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kXx2O-0007XO-Nb for geh-help-gnu-emacs@m.gmane-mx.org; Wed, 28 Oct 2020 21:47:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:53004) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kXx1n-0007X4-VH for help-gnu-emacs@gnu.org; Wed, 28 Oct 2020 21:47:03 -0400 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:43212 helo=ciao.gmane.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kXx1k-0001kx-RM for help-gnu-emacs@gnu.org; Wed, 28 Oct 2020 21:46:58 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kXx1b-0000kn-3B for help-gnu-emacs@gnu.org; Thu, 29 Oct 2020 02:46:47 +0100 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/28 21:46:48 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:124792 Archived-At: > round 2: > > Very simple: we are looking for a function that returns the number of > occurrences of a char in a string. > My solution! (defun count-char-in-string (the-char str) (seq-reduce (lambda (counter next) (+ counter (if (eq the-char next) 1 0))) str 0)) I really like this kind of things! Keep doing it! I learn a lot from other's answers. Cheers!