Lovely! Looks so functional.

module Enumerable
  def tally(&function)
    function ||= -> v { v }
    
    each_with_object(Hash.new(0)) do |value, hash|
      hash[function.call(value)] += 1
    end
  end
end
Ruby 2.7 — Enumerable#tally
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Brandon Weaver
Dmitry Shvetsov
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1 min read·
Feb 10, 2019
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Lovely! Looks so functional.
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Written by Dmitry Shvetsov520 Followers
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Software Engineer, Instructor, and Mentor. Author https://gum.co/team-lead-101. Join my newsletter https://gift.dmitryshvetsov.com/
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