From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: poffice@blade.nagaokaut.ac.jp Delivered-To: poffice@blade.nagaokaut.ac.jp Received: from kankan.nagaokaut.ac.jp (kankan.nagaokaut.ac.jp [133.44.2.24]) by blade.nagaokaut.ac.jp (Postfix) with ESMTP id F16F619C0036 for ; Mon, 26 Oct 2015 20:58:00 +0900 (JST) Received: from voscc.nagaokaut.ac.jp (voscc.nagaokaut.ac.jp [133.44.1.100]) by kankan.nagaokaut.ac.jp (Postfix) with ESMTP id 6F7CCB5D887 for ; Mon, 26 Oct 2015 21:25:40 +0900 (JST) Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by voscc.nagaokaut.ac.jp (Postfix) with ESMTP id 53E2E952439 for ; Mon, 26 Oct 2015 21:25:40 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 684A2120440; Mon, 26 Oct 2015 21:25:38 +0900 (JST) X-Original-To: ruby-core@ruby-lang.org Delivered-To: ruby-core@ruby-lang.org Received: from o10.shared.sendgrid.net (o10.shared.sendgrid.net [173.193.132.135]) by neon.ruby-lang.org (Postfix) with ESMTPS id 52BF7120421 for ; Mon, 26 Oct 2015 21:25:34 +0900 (JST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=sendgrid.me; h=from:to:references:subject:mime-version:content-type:content-transfer-encoding:list-id; s=smtpapi; bh=SM7oLeqYr3bzVm76p/02pRLvTdM=; b=Z3PZhAuWgjGXjb6NuQ vMjp0gTH/Dv0OGXOPWogmQmTWEa6/X30nakdXiGMmWbz2eTjAvIoib6aAI9i8reS e1/V3dWwy93ejpnaZsDfC31w89uw5uOkfNL9886NqCZrtUrQ0WV/uootUWiJMpt9 N1uEn5Bh9HPAYm9+mrQTcYhQs= Received: by filter0663p1mdw1.sendgrid.net with SMTP id filter0663p1mdw1.4263.562E1BB676 2015-10-26 12:25:26.867011748 +0000 UTC Received: from herokuapp.com (ec2-54-158-78-247.compute-1.amazonaws.com [54.158.78.247]) by ismtpd0005p1iad1.sendgrid.net (SG) with ESMTP id vlVpzrefThelPukD5CNCXA for ; Mon, 26 Oct 2015 12:25:27.012 +0000 (UTC) Date: Mon, 26 Oct 2015 12:25:26 +0000 From: wycats@gmail.com To: ruby-core@ruby-lang.org Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Redmine-MailingListIntegration-Message-Ids: 45813 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: wycats X-Mailer: Redmine X-Redmine-Host: bugs.ruby-lang.org X-Redmine-Site: Ruby Issue Tracking System X-Auto-Response-Suppress: All Auto-Submitted: auto-generated X-SG-EID: ync6xU2WACa70kv/Ymy4QrNMhiuLXJG8OTL2vJD1yS62wOqth4KmycCMf3PpvmR3d8ls9CX8tH1zda IBC7IQoqBXSQ7Zjtn46PxzJ99iGmPKQID9oCFCbyA+ENFjvt6CRUaXqM0eukBjhF7TCumwniO6uTo8 YHjUn8TFln6RfFGI4sYfqZ56vyz/xDw8WRaz X-ML-Name: ruby-core X-Mail-Count: 71186 Subject: [ruby-core:71186] [Ruby trunk - Feature #11537] Introduce "Safe navigation operator" X-BeenThere: ruby-core@ruby-lang.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: Ruby developers List-Id: Ruby developers List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #11537 has been updated by Yehuda Katz. Yukihiro Matsumoto wrote: > I like the idea. My remaining concern is ".?" is too similar to "?." which is chosen by other languages. > We cannot use "?." since it conflicts with a method call with a "*?" predicate method. > > Matz. I agree with this concern. I also agree with the idea of trying to make it more like a traditional infix operator by encouraging spaces. What about: ~~~ u && .profile && .thumbnails && .large ~~~ As shorthand for: ~~~ u && u.profile && u.profile.thumbnails && u.profile.thumbnails.large ~~~ It reads nicely to me and its meaning is clear. It also doesn't conflict with Ruby's method predicates (`?` suffix). Matz, what do you think? ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54565 * Author: Hiroshi SHIBATA * Status: Closed * Priority: Normal * Assignee: Yukihiro Matsumoto ---------------------------------------- I sometimes write following code with rails application: ```ruby u = User.find(id) if u && u.profile && u.profile.thumbnails && u.profiles.thumbnails.large ... ``` or ```ruby # Use ActiveSupport if u.try!(:profile).try!(:thumbnails).try!(:large) ... ``` I hope to write shortly above code. Groovy has above operator named "Safe navigation operator" with "`?.`" syntax. Ruby can't use "`?.`" operator. Can we use "`.?`" syntax. like this: ```ruby u = User.find(id) u.?profile.?thumbnails.?large ``` Matz. How do you think about this? -- https://bugs.ruby-lang.org/