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=-2.8 required=3.0 tests=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 430771F4BD for ; Sun, 6 Oct 2019 19:23:08 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id E8D49120993; Mon, 7 Oct 2019 04:22:58 +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 CF473120978 for ; Mon, 7 Oct 2019 04:22:56 +0900 (JST) Received: by filter0118p3las1.sendgrid.net with SMTP id filter0118p3las1-15319-5D9A3F11-1 2019-10-06 19:22:57.092446263 +0000 UTC m=+261306.167879803 Received: from herokuapp.com (unknown [34.201.109.215]) by ismtpd0065p1iad1.sendgrid.net (SG) with ESMTP id gtxwfTQTQHqVz5IWUDaCxA for ; Sun, 06 Oct 2019 19:22:56.965 +0000 (UTC) Date: Sun, 06 Oct 2019 19:22:57 +0000 (UTC) From: eregontp@gmail.com Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 70836 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 15323 X-Redmine-Issue-Author: alfonsojimenez X-Redmine-Sender: Eregon 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?KippOI8ZHtTweq7XfQzW93937kJ4QNWwSBuHnaMEcr1zgGjTH0zVK7w90I+AB2?= =?us-ascii?Q?H+wjM4IWnFpukgxXFV2=2F5Nv=2F0D5ZNZXT5x0fUhe?= =?us-ascii?Q?ugjWop3GhDwbNA9npGDzUfM86j=2FOZKzBAFE4Ysx?= =?us-ascii?Q?+lxOvrZjftRx5j6GkpUCe7=2FP3jmceCqsWdjaj54?= =?us-ascii?Q?08eH8uE1eM84=2Fd=2FyJLFRLcBPTkyjNH77kig=3D=3D?= To: ruby-core@ruby-lang.org X-ML-Name: ruby-core X-Mail-Count: 95249 Subject: [ruby-core:95249] [Ruby master Feature#15323] [PATCH] Proposal: Add Enumerable#filter_map 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="iso-8859-1" Content-Transfer-Encoding: quoted-printable Errors-To: ruby-core-bounces@ruby-lang.org Sender: "ruby-core" Issue #15323 has been updated by Eregon (Benoit Daloze). Isn't `enum.filter_map { |e| ... }` supposed to be (according to the name) = the same as `enum.map { |e| ... }.filter { |e| e }`? I'm not completely sure what is better, but to me it sounds surprising that= a method with `filter` in its name filters differently than `Enumerable#fi= lter` (which removes both false and nil values). ---------------------------------------- Feature #15323: [PATCH] Proposal: Add Enumerable#filter_map https://bugs.ruby-lang.org/issues/15323#change-81926 * Author: alfonsojimenez (Alfonso Jim=E9nez) * Status: Closed * Priority: Normal * Assignee: = * Target version: = ---------------------------------------- This is a proposal for a combined `filter` + `map` method (https://bugs.rub= y-lang.org/issues/5663). This method both filters and maps the elements of an enumerable in just one= iteration: ~~~ ruby (1..10).filter_map { |i| i * 2 if i.even? } #=3D> [4, 8, 12, 16, 20] ~~~ GitHub PR: https://github.com/ruby/ruby/pull/2017 = ---Files-------------------------------- 0001-Adding-Enumerable-filter_map.patch (4.61 KB) -- = https://bugs.ruby-lang.org/ Unsubscribe: