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 838FA19C0036 for ; Mon, 26 Oct 2015 13:43:23 +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 3EFE1B5D887 for ; Mon, 26 Oct 2015 14:11:01 +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 34C83952439 for ; Mon, 26 Oct 2015 14:11:00 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 3891D12043A; Mon, 26 Oct 2015 14:10:57 +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 755EE120421 for ; Mon, 26 Oct 2015 14:10:54 +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=eyHzGQJjvu0LwljrrhSpbgI/QEc=; b=Q0obs1CWNScPA5qO8K yBTGbgMmQ0kZYecFR2fANMqcp+1yfPjrfdAoN+MvRSPYOQ/HtuG7kbxeAH/3Pih8 EClj4PsnJI/5w1vZmP16MDQBFg8EGvK/jHHNDCcJ0x2LQRvmI1IXXfRwN0Hdoz+s lcdHDIH/jo0PV9McIMSIgqgMk= Received: by filter-352.sjc1.sendgrid.net with SMTP id filter-352.8755.562DB5D722 2015-10-26 05:10:47.520799856 +0000 UTC Received: from herokuapp.com (ec2-54-90-98-226.compute-1.amazonaws.com [54.90.98.226]) by ismtpd0001p1iad1.sendgrid.net (SG) with ESMTP id oYSKMLjRTauoEUyd7m1o3Q for ; Mon, 26 Oct 2015 05:10:47.483 +0000 (UTC) Date: Mon, 26 Oct 2015 05:10:47 +0000 From: transfire@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: 45809 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: trans 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS5PVMao6jnJ8qmNeU6QTsig3eJTf7nrz2iYUW Tp2CBtlVyico1GGCwrpQ6lSmSRH12BV26yXZYCXV9D/+oBSGVvO4zLgG4RdBf9LPjljxvMGNhKS7L/ nZfvVnmM/4vqkyg= X-ML-Name: ruby-core X-Mail-Count: 71182 Subject: [ruby-core:71182] [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 Thomas Sawyer. 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. Maybe there is a better syntax by requiring a space: u ? .profile ? .thumbnails ? .large In this way is more an extension of the ternary operator -- the initial dot on the method signals the difference. This should also allow: u ? .profile ? .thumbnails ? .large : default ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54562 * 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/