From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: Is there any default way to append hashes? Date: Tue, 4 May 2021 00:30:33 +0300 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7228"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.6 (2021-03-06) Cc: help-gnu-emacs@gnu.org To: Stefan Monnier Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Mon May 03 23:34:37 2021 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 1ldgD7-0001m4-8m for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 03 May 2021 23:34:37 +0200 Original-Received: from localhost ([::1]:41110 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ldgD6-0005gk-Aq for geh-help-gnu-emacs@m.gmane-mx.org; Mon, 03 May 2021 17:34:36 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:44852) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ldgCO-0005gN-JL for help-gnu-emacs@gnu.org; Mon, 03 May 2021 17:33:52 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:40623) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ldgCL-0003wT-KB for help-gnu-emacs@gnu.org; Mon, 03 May 2021 17:33:52 -0400 Original-Received: from localhost ([::ffff:154.227.59.100]) (AUTH: PLAIN securesender, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000046165.0000000060906C3A.000077D5; Mon, 03 May 2021 14:33:46 -0700 Mail-Followup-To: Stefan Monnier , help-gnu-emacs@gnu.org Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham 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:129385 Archived-At: * Stefan Monnier [2021-05-03 19:18]: > > I am using this function to append hashes, is there maybe some better > > or default method? > > Maybe you're looking for `map-merge`? Thank you. I have tried best to find something like that but could not. In the mean time I made the function below, and it does append or join keys and values from other hashes to the first one. Yes, I needed function to append or join other hashes to the first one which is being used. Now I know `map-merge' I can use it. (defun hash-append (h1 &rest hashes) "Return H1 hash appende with HASHES." (mapc (lambda (hash) (maphash (lambda (key value) (puthash key value h1)) hash)) hashes) h1) (setq h1 (make-hash-table :test 'equal)) (setq h2 (make-hash-table :test 'equal)) (puthash 'name "Jimmy" h1) (puthash "last" "Lorence" h1) (puthash "age" 12 h2) (puthash "city" "New York" h2) (hash-append h1 h2) ⇒ #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8125 data (name "Jimmy" "last" "Lorence" "age" 12 "city" "New York")) h1 ⇒ #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8125 data (name "Jimmy" "last" "Lorence" "age" 12 "city" "New York")) h2 ⇒ #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8125 data ("age" 12 "city" "New York")) The difference is that map-merge creates new hash-table without modification. (map-merge 'hash-table h1 h2) ⇒ #s(hash-table size 4 test equal rehash-size 1.5 rehash-threshold 0.8125 data (name "Jimmy" "last" "Lorence" "age" 12 "city" "New York")) h1 ⇒ #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8125 data (name "Jimmy" "last" "Lorence")) h2 ⇒ #s(hash-table size 65 test equal rehash-size 1.5 rehash-threshold 0.8125 data ("age" 12 "city" "New York")) -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns Sign an open letter in support of Richard M. Stallman https://stallmansupport.org/ https://rms-support-letter.github.io/