gist: 27182


  
    
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              # > {1 => 'a', 2 => 'b', 3 => 'a'}.values.histogram
# => {"a"=>2, "b"=>1}
class Array
  def histogram
    inject(Hash.new(0)) do |memo,value|
      memo[value] += 1
      memo
    end
  end
end
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