From: jzakiya@... Date: 2018-01-25T01:20:23+00:00 Subject: [ruby-core:85089] [Ruby trunk Feature#14399] Add Enumerable#product Issue #14399 has been updated by jzakiya (Jabari Zakiya). I looked here https://ruby-doc.org/core-2.5.0/Enumerable.html and didn't see that method, so I didn't know it existed. But `multiply` would also work. Where in the docs is `product`? The Ruby `product` then causes a conflict with the Crystal definition/use. ---------------------------------------- Feature #14399: Add Enumerable#product https://bugs.ruby-lang.org/issues/14399#change-69802 * 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: