From: shevegen@... Date: 2018-01-25T10:42:37+00:00 Subject: [ruby-core:85109] [Ruby trunk Feature#14399] Add Enumerable#product Issue #14399 has been updated by shevegen (Robert A. Heiler). > which is a little longer, but I think is more accurately > descriptive and intuitive. We are back to the ancient problem - giving things good names. :-) The only name from the above that I like is .sum - the others do not tell me much at all. ;-) I am not sure what .combinations would do - then again I also never fully understood the name .reduce() either. People often associate different actions with the same (but also different) names. ---------------------------------------- Feature #14399: Add Enumerable#product https://bugs.ruby-lang.org/issues/14399#change-69822 * 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: