From: duerst@... Date: 2019-02-02T06:21:33+00:00 Subject: [ruby-core:91381] [Ruby trunk Feature#11076] Enumerable method count_by Issue #11076 has been updated by duerst (Martin D��rst). sawa (Tsuyoshi Sawada) wrote: > Since this feature is an inferior variant of `group_by` in the sense that it reduces the value arrays into their lengths, what about naming the method `group`? Please not. The `_by` indicates that there is some specific criterion for grouping. This is the same for this method, so removing the `_by` is very strange. Also, the fact that the result contains numbers, not the actual groups, is completely lost. Compared with this, `count_by` is much better, and so is `tally`. Other possibilities might be `group_by_and_count` or `count_by_group` or something similar. ---------------------------------------- Feature #11076: Enumerable method count_by https://bugs.ruby-lang.org/issues/11076#change-76636 * Author: haraldb (Harald B��ttiger) * Status: Open * Priority: Normal * Assignee: * Target version: ---------------------------------------- I very often use `Hash[array.group_by{|x|x}.map{|x,y|[x,y.size]}]`. Would be nice with to have a method called `count_by`: ~~~ruby array = ['aa', 'aA', 'bb', 'cc'] p array.count_by(&:downcase) #=> {'aa'=>2,'bb'=>1,'cc'=>1} ~~~ -- https://bugs.ruby-lang.org/ Unsubscribe: