From: shannonskipper@... Date: 2018-01-25T00:21:02+00:00 Subject: [ruby-core:85086] [Ruby trunk Feature#14399] Add Enumerable#product Issue #14399 has been updated by shan (Shannon Skipper). Array#product would stomp on Enumerable#product, and it confusingly does a different thing: ~~~ ruby [2,3,5,7].product => [[2], [3], [5], [7]] ~~~ Maybe Enumerable#multiply would compliment Enumerable#sum? ---------------------------------------- Feature #14399: Add Enumerable#product https://bugs.ruby-lang.org/issues/14399#change-69800 * Author: jzakiya (Jabari Zakiya) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- For similar reasons for creating `Enumerable#sum` a companion method `Enumerable#product` is also very useful. Taking the product of numbers in arrays is a common operation in many numerical algorithms, especially in number theory and cryptography, and its optimization in Ruby will make it more conducive to math heavy algorithms and tasks. This ``` > [2,3,5,7].reduce(:*) => 210 ``` can be optimized to this ``` > [2,3,5,7].product => 210 ``` It should also allow an initial value ``` > [2,3,5,7].product(2) => 420 > [2,3,5,7].product(0.5) => 105 ``` Crystal already has this `method`. -- https://bugs.ruby-lang.org/ Unsubscribe: