Ruby Issue Tracking System

04/20/2015

03:35 PM Ruby Feature #11076: Enumerable method count_by

Robert A. Heiler wrote:
> Can you also add a sentence or two for documentation? :-)
I am sorry but I am not sure to properly format this, but the documentation would be like:
Syntax:
group_by { |obj| block } → a_hash
... haraldb (Harald Böttiger)

04/19/2015

08:38 PM Ruby Feature #11076 (Closed): Enumerable method count_by

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}
~~~ haraldb (Harald Böttiger)

08:30 PM Ruby Feature #11049: Enumerable#grep_v (inversed grep)

Recursive Madman wrote:
> How about implementing `Regexp#invert` instead?
As grep using the case statement this would be ignoring a lot of cases that would be handy:
> array.invert_grep(Array) # Select all elements that are not ar... haraldb (Harald Böttiger)