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 F313217D3B18 for ; Sat, 7 Nov 2015 09:20:15 +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 7F53CB5D874 for ; Sat, 7 Nov 2015 09:49:25 +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 8FEBC18CC7B6 for ; Sat, 7 Nov 2015 09:49:25 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 4BCD5120481; Sat, 7 Nov 2015 09:49:22 +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 B18A812044A for ; Sat, 7 Nov 2015 09:49:18 +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=Jm80ey8hhBYwlPxc37sjOY23bmk=; b=T/EkgvgS+XH3qjspSO tSGIAYQdq08e0m2TbEvmk21YzKKDCVL3829f5TBNIsqNFsph5JxeQzkDB9KuR+PG z4+1zerPzLEjSNui9eafDwfuy+e3NdhAyx1ZNu6gqqf5JCBViyiO1PESBkmb/2B0 e/diCDd2vHyn/wThyuk4m4/SM= Received: by filter-342.sjc1.sendgrid.net with SMTP id filter-342.29417.563D4A8A29 2015-11-07 00:49:14.669620967 +0000 UTC Received: from herokuapp.com (ec2-54-204-162-91.compute-1.amazonaws.com [54.204.162.91]) by ismtpd0004p1iad1.sendgrid.net (SG) with ESMTP id 9vQvZ-XiTkeQ7lyXyEqldA for ; Sat, 07 Nov 2015 00:49:14.680 +0000 (UTC) Date: Sat, 07 Nov 2015 00:49:14 +0000 From: nobu@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: 46015 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: nobu 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS6q7ESTdPFBBW707+eOTvZBTp+F8Mn+euhv25 EsqeTYSG6XUBN1JmVofYtiy1WLvcimBESXuDVFfUAKd3aWllGaVRi3TIX99vxcpl9iL6oaetRjPNf8 f5GJYWALXhzg4eo= X-SendGrid-Contentd-ID: {"test_id":"1446857355"} X-ML-Name: ruby-core X-Mail-Count: 71374 Subject: [ruby-core:71374] [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 Nobuyoshi Nakada. Rodrigo Rosenfeld Rosas wrote: > Did you mean `.?` and `&.` would be implemented in the same way? Yes. > For example: `false.?inexistent` will raise. Should `false&.inexisting` raise or return `false`? It will raise a `NoMethodError`. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54744 * 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/