From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS4713 221.184.0.0/13 X-Spam-Status: No, score=-2.7 required=3.0 tests=AWL,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_PASS shortcircuit=no autolearn=no autolearn_force=no version=3.4.2 Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by dcvr.yhbt.net (Postfix) with ESMTP id 62DC31F4C0 for ; Wed, 23 Oct 2019 07:50:41 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 6FB85120A80; Wed, 23 Oct 2019 16:50:31 +0900 (JST) Received: from xtrwkhkc.outbound-mail.sendgrid.net (xtrwkhkc.outbound-mail.sendgrid.net [167.89.16.28]) by neon.ruby-lang.org (Postfix) with ESMTPS id 40483120A7F for ; Wed, 23 Oct 2019 16:50:29 +0900 (JST) Received: by filter0080p3iad2.sendgrid.net with SMTP id filter0080p3iad2-1623-5DB00648-14 2019-10-23 07:50:32.174971896 +0000 UTC m=+120046.668524608 Received: from herokuapp.com (unknown [52.91.158.104]) by ismtpd0046p1iad2.sendgrid.net (SG) with ESMTP id chtDs8urQquMdGpMOaEChA for ; Wed, 23 Oct 2019 07:50:32.062 +0000 (UTC) Date: Wed, 23 Oct 2019 07:50:32 +0000 (UTC) From: zverok.offline@gmail.com Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 71086 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 16273 X-Redmine-Issue-Author: osyo X-Redmine-Sender: zverok 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: =?us-ascii?Q?3be0g8093pjUjT94eiCA64csFDBI=2FmHQTWm54P5gda64jEbvjeoMnL3I=2FWDWnU?= =?us-ascii?Q?avDt7lEoanqUQgCSEyIb71kPTl0c5yd6pot8qnl?= =?us-ascii?Q?wuwdOV2Te79Oq3um1snso2kUFAeZyA=2FTp+eTe12?= =?us-ascii?Q?5w+GEMJO6lhd7dIW18ul7rsGRQz+mB6ygwp0MP8?= =?us-ascii?Q?Ox1TeMuXWWIwto529BnArIhbESN8Cb2TMiQ=3D=3D?= To: ruby-core@ruby-lang.org X-ML-Name: ruby-core X-Mail-Count: 95494 Subject: [ruby-core:95494] [Ruby master Feature#16273] Proposal: Shorthand operator for "#instance_method" 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #16273 has been updated by zverok (Victor Shepelev). Funnily enough (and not completely intentionally) the problem is "solved" with #16264: ```ruby .:zip.call(*arrays) # or even... for those who likes to cry "code golf!" .:zip.(*arrays) ``` Currently, you also can ```ruby :zip.to_proc.call(*arrays) ``` Though, I tend to agree with @mrkn that "no-tricks" first example looks pretty clear... But I understand that in codebase where this metaphor emerges regularly, it could become tiresome and too non-atomic to read. One another non-orthodox suggestion (which uses `#then` loathed by some, but of all the rest of examples the only one which reads directly "zip first array with the rest of them"): ```ruby arrays.then { |first, *rest| first.zip(*rest) } ``` ---------------------------------------- Feature #16273: Proposal: Shorthand operator for "#instance_method" https://bugs.ruby-lang.org/issues/16273#change-82265 * Author: osyo (manga osyo) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- hi, created issues to discuss shorthand for "#instance_method" ## Overview Ruby 2.7 adds a `#method` shorthand `.:` operator. * [Feature #12125: Proposal: Shorthand operator for Object#method - Ruby master - Ruby Issue Tracking System](https://bugs.ruby-lang.org/issues/12125) * [Feature #13581: Syntax sugar for method reference - CommonRuby - Ruby Issue Tracking System](https://bugs.ruby-lang.org/issues/13581) In this issues want to discuss the shorthand operator for "#instance_method". ## Background If you want to pass an array to `Array#zip` or `Hash#merge` as shown below, the code will be messy. ```ruby arrays = [["a", "b"], ["c"], ["d", "e"]] hashs = [{"a" => 1}, {"b" => 2, "c" => 3}, {"d" => 4, "e" => 5}] # `#first` must be a receiver and the value excluding `#first` must be passed as an argument arrays.first.zip(*arrays.drop(1)) arrays.first.product(*arrays.drop(1)) hashs.first.merge(*hashs.drop(1)) ``` This can be solved by using `# bind_call` ([# 15955] (https://bugs.ruby-lang.org/issues/15955)). ```ruby arrays = [["a", "b"], ["c"], ["d", "e"]] hashs = [{"a" => 1}, {"b" => 2, "c" => 3}, {"d" => 4, "e" => 5}] Array.instance_method(:zip).bind_call(*arrays) Array.instance_method(:product).bind_call(*arrays) Hash.instance_method(:merge).bind_call(*hashs) ``` But `#instance_method` is long. I'm thinking shorthand operator for `#instance_method`. :MEMO: There was a suggestion to add `Array.zip` or `Array.product` in the past * [Feature #8970: Array.zip and Array.product - Ruby master - Ruby Issue Tracking System](https://bugs.ruby-lang.org/issues/8970) * [Feature #6499: Array::zip - Ruby master - Ruby Issue Tracking System](https://bugs.ruby-lang.org/issues/6499) * [Feature #7444: Array#product_set - Ruby master - Ruby Issue Tracking System](https://bugs.ruby-lang.org/issues/7444) ## Proposal new operator I can't come up with a suitable operator yet, sorry... However, considering the `.:` operator, I think "operator + Symbol (`:`)" is good. ```ruby # Document-like writing # `#` + operator Array#zip Array.#zip Array#:zip # Constant-link writing # :: + :hoge Array:::zip Array::#zip ``` Also, the following syntax is valid at this time, so it may be difficult to adopt. ```ruby Array!zip Array@zip Array&zip Array:zip ``` Please comment if you are interested in the shorthand operator for `# instance_method`. * Other `#instance_method` usecase * Proposal shorthand operator * etc... Thank you! :) -- https://bugs.ruby-lang.org/