siruguri/count_dupes.rb

Created May 31, 2015

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Gathering counts of possibly duplicated items in an array

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count_dupes.rb

      
        a = [1, 1, 1, 2, 3, 3, 4, 4, 4, 4]
      
        b = a.uniq
      
        counts = b.inject({}) do |memo, key|
      
          memo[key] = a.count(key)
      
          memo
      
        end

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siruguri commented Oct 6, 2015

Another solution:

counts = a.group_by { |a| a}.map {|pair| {pair[0]=> pair[1].size}}

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