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=-3.9 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED, SPF_HELO_NONE,SPF_PASS shortcircuit=no autolearn=ham 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 0A4F51F4C0 for ; Tue, 22 Oct 2019 20:53:02 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id B0D59120A3C; Wed, 23 Oct 2019 05:52:50 +0900 (JST) Received: from o1678948x4.outbound-mail.sendgrid.net (o1678948x4.outbound-mail.sendgrid.net [167.89.48.4]) by neon.ruby-lang.org (Postfix) with ESMTPS id B0045120A30 for ; Wed, 23 Oct 2019 05:52:47 +0900 (JST) Received: by filter0061p3iad2.sendgrid.net with SMTP id filter0061p3iad2-14231-5DAF6C20-51 2019-10-22 20:52:48.48051086 +0000 UTC m=+80673.654516606 Received: from herokuapp.com (unknown [54.175.237.173]) by ismtpd0015p1iad1.sendgrid.net (SG) with ESMTP id VYrwRPTNSrGXgFCkckxA5A for ; Tue, 22 Oct 2019 20:52:48.562 +0000 (UTC) Date: Tue, 22 Oct 2019 20:52:48 +0000 (UTC) From: daniel@dan42.com Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 71071 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 16261 X-Redmine-Issue-Author: zverok X-Redmine-Sender: Dan0042 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?8sy4RigFvRTdBfCVJrT9zb2J88PC92TMQwdNgaWYaq5wyCSC9bRthGDf1VFBjb?= =?us-ascii?Q?+fK=2F+QDvxoOrnbVYl1mWWxJwdkVe9mfP9iqgZWR?= =?us-ascii?Q?NMw2cesbOG4=2FBFKYWtZKnDMALPIQq6tTwpkWHGw?= =?us-ascii?Q?zAGSnNWGJNCqWjlxfYOl6ZXZ5DktpEfJa1lPrTM?= =?us-ascii?Q?f2CftskhQ7v1N7gzImwauPa2WskOPNyanzQ=3D=3D?= To: ruby-core@ruby-lang.org X-ML-Name: ruby-core X-Mail-Count: 95479 Subject: [ruby-core:95479] [Ruby master Feature#16261] Enumerable#each_tuple 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 #16261 has been updated by Dan0042 (Daniel DeLorme). @eregon Thank you very much for the enlightenment! That means the code above could be rewritten like this. And at that point it's doubtful if `tuple` is even needed. ```ruby class Enumerator def splat return to_enum(:splat) unless block_given? each_entry{ |item| yield(*item) } end def tuple return to_enum(:tuple) unless block_given? each_entry{ |item| yield(Array===item ? item : [item]) } end end ``` ---------------------------------------- Feature #16261: Enumerable#each_tuple https://bugs.ruby-lang.org/issues/16261#change-82249 * Author: zverok (Victor Shepelev) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- New method proposal. Prototype code: ```ruby module Enumerable def each_tuple return to_enum(__method__) unless block_given? each { |item| yield(*item) } # unpacking possible array into several args end end ``` Supposed documentation/explanation: > For enumerable with Array items, passes all items in the block provided as a separate arguments. t could be useful if the provided block has lambda semantics, e.g. doesn't unpack arguments automatically. For example: ```ruby files = ["README.md", "LICENSE.txt", "Contributing.md"] content = [fetch_readme, fetch_license, fetch_contributing] # somehow make a content for the files files.zip(content).each_tuple(&File.:write) # writes to each file its content ``` > When no block passed, returns enumerator of the tuples: ```ruby [1, 2, 3].zip([4, 5, 6]).each_tuple.map(&:+) # => [5, 7, 9] ``` -- https://bugs.ruby-lang.org/