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 E564F19C0029 for ; Fri, 6 Nov 2015 09:56:43 +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 D04B0B5D92C for ; Fri, 6 Nov 2015 10:25:45 +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 EF2FC18CC7B1 for ; Fri, 6 Nov 2015 10:25:38 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 1CFEC1204D5; Fri, 6 Nov 2015 10:25:36 +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 9BA0E12047C for ; Fri, 6 Nov 2015 10:25:32 +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=zcxZ0tPdcgjveD+p8N0bYgIA4xM=; b=TmOikpZGTc0Vrnd9qg V2IhXl0IdRH1JRHD+Z15QnQBi5tlN4P70hpELv6s1BTDbCSojFSQamixS1beTj6a 9wtCR9w9k2ev9dmmO5YbI3BiPQJA2A1eefzmqEMEJHMt3ixgFXGZ73zJ2YK1HE7w HocnFIDb+uE/NBD1gTCKnYdEQ= Received: by filter-461.sjc1.sendgrid.net with SMTP id filter-461.30232.563C0188F 2015-11-06 01:25:28.373727886 +0000 UTC Received: from herokuapp.com (ec2-107-22-66-12.compute-1.amazonaws.com [107.22.66.12]) by ismtpd0004p1iad1.sendgrid.net (SG) with ESMTP id Cdf6JmmqTvGxhmk4Dsnwog for ; Fri, 06 Nov 2015 01:25:28.410 +0000 (UTC) Date: Fri, 06 Nov 2015 01:25:28 +0000 From: matz@ruby-lang.org 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: 46004 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: matz 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS5Ca12enkFg5Ts8yguPpq6xKZPqbJ/KI9zlBG qCqqCsCa+g7a/4GG8b60zU+SHqHx+F8YJPkyygoRSLnQv0fLKW6mIz8zFHMv6eC4h79JVZp6pYpuqz HvkowVUEDWPE+7Y= X-ML-Name: ruby-core X-Mail-Count: 71363 Subject: [ruby-core:71363] [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 Yukihiro Matsumoto. I think about this for a while, and thinking of introducing `&.` instead of `.?`, because: * `.?` is similar to `?.` in Swift and other languages, but is different anyway. * Since `?` is a valid suffix of method names in Ruby, we already see a lot of question marks in our programs. * `u&.profile` reminds us as short form of `u && u.profile`. But behavior of `&.` should be kept, i.e. it should skip `nil` but recognize `false`. Matz. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54729 * 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/