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 86EF419C004F for ; Sat, 7 Nov 2015 02:41:43 +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 75077B5D858 for ; Sat, 7 Nov 2015 03:10:51 +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 541E718CC7B5 for ; Sat, 7 Nov 2015 03:10:51 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id C09731204DA; Sat, 7 Nov 2015 03:10:48 +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 BE4A812045B for ; Sat, 7 Nov 2015 03:10:44 +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=q+LDXDOEQCudbfFgsoGV5NeDveY=; b=UotOQXsfdEX6PJZKSS 6NoGOz2wwIN9XlgW4ipGpcILzk+bJJ6kBfWe6iXoI+ta3tDphNrzd+E7U3QkTLTu EUkX6l8dgQuTZkJ8QP6+HPkSHq9UaaTjXUJT9tK4lk5pydWRnLJuU2yKp93cIbT1 0lFDzOmBomkU9Vw8Kg1D2XjKQ= Received: by filter0568p1mdw1.sendgrid.net with SMTP id filter0568p1mdw1.9133.563CEC3729 2015-11-06 18:06:47.142164756 +0000 UTC Received: from herokuapp.com (ec2-54-80-117-211.compute-1.amazonaws.com [54.80.117.211]) by ismtpd0001p1iad1.sendgrid.net (SG) with ESMTP id 0X-55XGdSJyCuqkvdm4DPQ for ; Fri, 06 Nov 2015 18:06:47.633 +0000 (UTC) Date: Fri, 06 Nov 2015 18:06:47 +0000 From: rr.rosas@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: 46014 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: rosenfeld 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS6fE0yvGX/SvVl8KURZJjK0xFEPrZztigvcJs Fm0pBF7DqKs2TKyESSjd1Tc3rIQdw4eNcf5dX9/0AWhowdYkNliCysLQjAPYv5q+w3R8FSjVaka949 qy9Vh4yvRyTCj7M0KxEnK5YHfdaVRHN9iQFe X-SendGrid-Contentd-ID: {"test_id":"1446833213"} X-ML-Name: ruby-core X-Mail-Count: 71373 Subject: [ruby-core:71373] [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 Rodrigo Rosenfeld Rosas. Yukihiro Matsumoto wrote: > But behavior of `&.` should be kept, i.e. it should skip `nil` but recognize `false`. I'm not sure I understood exactly what you meant by this. Did you mean .? and &. would be implemented in the same way? For example: false.?inexistent will raise. Should false&.inexisting raise or return false? I'd like to see it always raising no matter you decide for ".?" or "&.". I don't see any reasons why one would like to call a method conditionally in the false object. If this happens it's must likely to be a bug from the method returning false. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54743 * 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/