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 81E7219A0B37 for ; Sat, 19 Sep 2015 12:46:39 +0900 (JST) Received: from funfun.nagaokaut.ac.jp (smtp.nagaokaut.ac.jp [133.44.2.201]) by kankan.nagaokaut.ac.jp (Postfix) with ESMTP id AC91BB5D8FC for ; Sat, 19 Sep 2015 13:09:28 +0900 (JST) Received: from voscc.nagaokaut.ac.jp (voscc.nagaokaut.ac.jp [133.44.1.100]) by funfun.nagaokaut.ac.jp (Postfix) with ESMTP id 22E5397A826 for ; Sat, 19 Sep 2015 13:09:30 +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 8EAFB95241E for ; Sat, 19 Sep 2015 13:09:28 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 7E7EF1206CC; Sat, 19 Sep 2015 13:09:26 +0900 (JST) X-Original-To: ruby-core@ruby-lang.org Delivered-To: ruby-core@ruby-lang.org Received: from o2.heroku.sendgrid.net (o2.heroku.sendgrid.net [67.228.50.55]) by neon.ruby-lang.org (Postfix) with ESMTPS id 559B81205A7 for ; Sat, 19 Sep 2015 13:09:23 +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=rwtLHOvvOED/Jhd9jv442AWaLas=; b=aSdaI9QcHvtRwhPu+C so71pE1IVjAY0OlwYNDCrl2GSwzdO3beFtbDER4Lz1OYx3pHhCvnWUPk5Fkrk2aw Vsg19gvMvmAUMBZuzCZnWvpN/OZ33TsV2EhqQpyXNGGIoHBexGoRETW2r4IzZjgl wL3SsuPC0By6o3oUETaDwIOwg= Received: by filter0641p1mdw1.sendgrid.net with SMTP id filter0641p1mdw1.32674.55FCDFEE39 2015-09-19 04:09:18.868749218 +0000 UTC Received: from herokuapp.com (ec2-54-90-212-243.compute-1.amazonaws.com [54.90.212.243]) by ismtpd0003p1iad1.sendgrid.net (SG) with ESMTP id DEcRPXxnQRaky9NaYekU-g for ; Sat, 19 Sep 2015 04:09:18.728 +0000 (UTC) Date: Sat, 19 Sep 2015 04:09:18 +0000 From: matthew@kerwin.net.au 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: 45475 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: phluid61 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS684y4prvL60zuAfCBiq2xtrdabdlPmdojqjI WSZeyV7w2YWuLxlRTecse0vvuKDvkIVfPr7Lxm28ZbPex01nFbHRkTBTM7z+MOrv00rrwLFKH9pQk+ t7+K6bxnLYY+4rguqMU6qJ1NL7DLOiGEGFhY X-ML-Name: ruby-core X-Mail-Count: 70862 Subject: [ruby-core:70862] [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 Matthew Kerwin. As per the discussion a few years ago in #8191, I'm +1 for `.?foo` syntax. I still have a lingering question about the following; does this print "Hello" twice? a = Object.new def a.b puts "Hello" end a.?b.?c a && a.b && a.b.c # this does a.try!(:b).try!(:c) # this doesn't (?) I think it should NOT call `a.b` twice. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54242 * Author: Hiroshi SHIBATA * Status: Open * 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/