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 2BE1E19C0036 for ; Mon, 26 Oct 2015 22:31:35 +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 041E1B5D88B for ; Mon, 26 Oct 2015 22:59:15 +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 DDBA5952439 for ; Mon, 26 Oct 2015 22:59:14 +0900 (JST) Received: from [221.186.184.76] (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id D7E8E120458; Mon, 26 Oct 2015 22:59:13 +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 4D76112043B for ; Mon, 26 Oct 2015 22:59:08 +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=vQj2CJqLZ1OSuVpv/q2CyhaDyVk=; b=gH7WGrJP5hi9HWwVET aZAr3fUA/M97KIz4UJX7HC/BEw7eZ+sYJjmYXLEqDJRdDNG0gA0T+l7H4qe2IFvN wpLesMpWtOyJ+umm6J5AwY3q/tZS8qfAeYtCanb0A0cOK4DlwTTlB8DzO93D9is3 0ZzA2oxq5m6YW5eXRR88j/IO4= Received: by filter0474p1mdw1.sendgrid.net with SMTP id filter0474p1mdw1.25977.562E31A24D 2015-10-26 13:58:58.598746068 +0000 UTC Received: from herokuapp.com (ec2-54-145-86-218.compute-1.amazonaws.com [54.145.86.218]) by ismtpd0001p1iad1.sendgrid.net (SG) with ESMTP id Qw7D67q7StqC83LV_z6eqQ for ; Mon, 26 Oct 2015 13:58:58.855 +0000 (UTC) Date: Mon, 26 Oct 2015 13:58:58 +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: 45817 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/Ymy4QrNMhiuLXJG8OTL2vJD1yS7Rln0/KAkPEtbdZ81arn7OfUa/j7YWADxr6o g3tQm7vXa/mU9hQ1X7/WoQo7iB9s1YAfUniZS/5uPlx1VLLQrXk9GeL8Yk+hgnNSNxhTNk2c7cPjDY SR6oBVZwpMEjDLrnBjfrlkL2iCliXU3J2dRJ X-ML-Name: ruby-core X-Mail-Count: 71190 Subject: [ruby-core:71190] [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. Yehuda Katz wrote: > As shorthand for: > > ~~~ > u && u.profile && u.profile.thumbnails && u.profile.thumbnails.large > ~~~ Actually, it would be a shorthand for something like: ~~~ u && (tmp1 = u.profile) && (tmp2 = tmp1.thumbnails) && tmp2.large ~~~ But I still prefer the syntax implemented in trunk as it's similar to other languages and will be more familiar for those used to the operator in Groovy and CoffeeScript, for example. ---------------------------------------- Feature #11537: Introduce "Safe navigation operator" https://bugs.ruby-lang.org/issues/11537#change-54569 * 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/