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hrstt/gist:1119133

Created August 1, 2011 22:19
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extract duplicate value in array
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gistfile1.rb
a = [1,2,3,4,5,6,4,5]
a.inject(Hash.new 0) {|h,v| h[v]+= 1;h}.select {|h,v| v >= 2}.keys #=> [4,5]
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