From: mame@...
Date: 2019-02-07T08:10:19+00:00
Subject: [ruby-core:91465] [Ruby trunk Feature#11076] Enumerable method	count_by

Issue #11076 has been updated by mame (Yusuke Endoh).

Assignee changed from mame (Yusuke Endoh) to nobu (Nobuyoshi Nakada)

Nobu has already started creating a patch.  Leave it to him.

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Feature #11076: Enumerable method count_by
https://bugs.ruby-lang.org/issues/11076#change-76726

* Author: haraldb (Harald B��ttiger)
* Status: Assigned
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
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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}
~~~



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