[#91458] [Ruby trunk Feature#4475] default variable name for parameter — matz@...
Issue #4475 has been updated by matz (Yukihiro Matsumoto).
3 messages
2019/02/07
[ruby-core:91380] [Ruby trunk Feature#11076] Enumerable method count_by
From:
sawadatsuyoshi@...
Date:
2019-02-02 03:01:09 UTC
List:
ruby-core #91380
Issue #11076 has been updated by sawa (Tsuyoshi Sawada).
knu (Akinori MUSHA) wrote:
> In today's developer meeting, Matz understood the need for the feature but didn't like the name. One point he made was that existing pairs like sort/sort_by and max/max_by share their features, so count_by() might not go well with count().
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`?
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Feature #11076: Enumerable method count_by
https://bugs.ruby-lang.org/issues/11076#change-76635
* Author: haraldb (Harald B旦ttiger)
* Status: Open
* Priority: Normal
* Assignee:
* 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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