# File lib/faster_csv.rb, line 540
      def [](index_or_header)
        if @mode == :row or  # by index
           (@mode == :col_or_row and index_or_header.is_a? Integer)
          @table[index_or_header]
        else                 # by header
          @table.map { |row| row[index_or_header] }
        end
      end