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_PASS,T_SPF_HELO_TEMPERROR 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 31E071F454 for ; Mon, 11 Nov 2019 15:18:33 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id 64300120A49; Tue, 12 Nov 2019 00:18:22 +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 7F66A120A46 for ; Tue, 12 Nov 2019 00:18:20 +0900 (JST) Received: by filter0140p3las1.sendgrid.net with SMTP id filter0140p3las1-2036-5DC97BC2-78 2019-11-11 15:18:26.440287169 +0000 UTC m=+322293.266336290 Received: from herokuapp.com (unknown [35.171.185.2]) by ismtpd0036p1iad2.sendgrid.net (SG) with ESMTP id 1avt3ZD2RP-7yCN-c9p8xA for ; Mon, 11 Nov 2019 15:18:26.296 +0000 (UTC) Date: Mon, 11 Nov 2019 15:18:26 +0000 (UTC) From: non.dmitriy@gmail.com Message-ID: References: Mime-Version: 1.0 X-Redmine-MailingListIntegration-Message-Ids: 71416 X-Redmine-Project: ruby-trunk X-Redmine-Issue-Id: 16341 X-Redmine-Issue-Author: Nondv X-Redmine-Sender: Nondv 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?EtUBU5pNPGGF695WqpG6VxCA85Kr9QQx+VRnpZEtiFdkYVBBwSZUsd2gHFdt6P?= =?us-ascii?Q?u6bNv0KHmavHzptT7lBP4MuH8lIzOg56iEG+eHt?= =?us-ascii?Q?aavEwhaHa77WuCZk0GAHVQUBnuNn+mhTW8Uwinj?= =?us-ascii?Q?yHOvRvBFcI8A4c++nfJ886ny42rvBG5YX9A8hpG?= =?us-ascii?Q?CDPIACemRLbxxGhUjH5V8OX7GbVu1wCAo1g=3D=3D?= To: ruby-core@ruby-lang.org X-ML-Name: ruby-core X-Mail-Count: 95791 Subject: [ruby-core:95791] [Ruby master Feature#16341] Proposal: Set#to_proc 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 #16341 has been updated by Nondv (Dmitry Non). Well, `to_proc` allows to send objects as blocks which can be quite useful not just in case of `select`/`reject`. Also, probably, those two are used more often than `grep`/`grep_v`. Another example from the top of my head is `count`: ```ruby dogs = Set[:labrador, :husky, :bullterrier, :corgi] pets = [:parrot, :labrador, :goldfish, :husky, :labrador, :turtle] pets.count(&:dogs) # ===> 3 ``` ---------------------------------------- Feature #16341: Proposal: Set#to_proc https://bugs.ruby-lang.org/issues/16341#change-82612 * Author: Nondv (Dmitry Non) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- ``` ruby class Set def to_proc -> (x) { include?(x) } # or method(:include?).to_proc end end ``` Usage: ```ruby require 'set' banned_numbers = Set[0, 5, 7, 9] (1..10).reject(&banned_numbers) # ===> [1, 2, 3, 4, 6, 8, 10] ``` -- https://bugs.ruby-lang.org/