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 D8D6717D3B18 for ; Sat, 7 Nov 2015 11:03:16 +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 CA2A7B5D871 for ; Sat, 7 Nov 2015 11:32:26 +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 E810D18CC7B2 for ; Sat, 7 Nov 2015 11:32:26 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id A416B120460; Sat, 7 Nov 2015 11:32:24 +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 E0BB712044E for ; Sat, 7 Nov 2015 11:32:20 +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=6flVySKsC0KSHkAvG3RZJNSk3x0=; b=SctJYHALq6RfnRC6YJ TUT3eu3ue8JKH2qJcQtKh4DOc3zD8by5STF8LqUPphP4MEcVooer/WrWmtd2OKjT 2u+zaKkZ+Iy3Xb38PqQqRWDT903rK15ZaziBVrt7MMvM3MidWzUcbDc82o8lQBa5 vVL62sWOd9d/8S4xi/yodLuY8= Received: by filter0841p1mdw1.sendgrid.net with SMTP id filter0841p1mdw1.1681.563D62AE39 2015-11-07 02:32:14.409057744 +0000 UTC Received: from herokuapp.com (ec2-54-167-194-89.compute-1.amazonaws.com [54.167.194.89]) by ismtpd0006p1iad1.sendgrid.net (SG) with ESMTP id Hi6dvPO4RAiYy9fpR2faMQ for ; Sat, 07 Nov 2015 02:32:14.362 +0000 (UTC) Date: Sat, 07 Nov 2015 02:32:14 +0000 From: ko1@atdot.net 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: 46016 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 11537 X-Redmine-Issue-Author: hsbt X-Redmine-Issue-Assignee: matz X-Redmine-Sender: ko1 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS5w3tqmaWIfuEftFjOhS1mQTV7E6bnR84Gh7l UH+xPeR/4Xzny+Hwzd2+OGKyiGFUs5E6W7YHYYZVtQn+t68qnAWmintwljLT0Rx4cm5o2FacCK5eJ/ onBTm8j5lW0OUDKVU9id1+qvDZUctRftZDNV X-SendGrid-Contentd-ID: {"test_id":"1446863536"} X-ML-Name: ruby-core X-Mail-Count: 71375 Subject: [ruby-core:71375] [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 Koichi Sasada. I have weak objection because `foo&.bar` seems check nil *and* false. Maybe this is because I read this expression as "foo and foo.bar", which expression checks also false. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54746 * 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/