Hi Osawa,
Please send a pull request for Enum.count_by:
iex> Enum.count_by(~w{aa aA bb cc}, fn x -> String.downcase(x) end)
%{"aa" => 2, "bb" => 1, "cc" => 1}
It is meant to mirror group_by.
If someone has an objection against count_by, please let us know.
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