From: duerst@...
Date: 2015-04-20T08:14:14+00:00
Subject: [ruby-core:68935] [Ruby trunk - Feature #11076] Enumerable method	count_by

Issue #11076 has been updated by Martin D��rst.


Having this would definitely be very useful. I remember having searched for a 'count_by' method more than once in the past.

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Feature #11076: Enumerable method count_by
https://bugs.ruby-lang.org/issues/11076#change-52200

* Author: Harald B��ttiger
* Status: Open
* Priority: Low
* Assignee: 
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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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