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kisai/find_duplicate_array.rb

Created August 20, 2014 16:10
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Find duplicates in a array
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find_duplicate_array.rb
ary = ["A", "B", "C", "B", "A"]
ary.group_by { |e| e }.select { |k, v| v.size > 1 }.map(&:first)
ary.sort.chunk { |e| e }.select { |e, count| count.size > 1 }.map(&:first)
ary.select { |e| ary.count(e) > 1 }.uniq
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