unzip.rb

class Array
    def unzip
        #r = Array.new(self[0].size) {[]}
        #each { |arr|
        each_with_object(Array.new(self[0].size){[]}) {|arr, r|
            arr.each_with_index { |x, i|
                r[i] << x
            }
        }
        #r
    end
end