def row row_number

      if row_number == 0

        cells = []

        if @has_titles

          @column_titles.each do |title|
            cells << title ? title : ''
          end

        end

        cells
        
      else

        @engine.generate(row_number, @columns, @cell_styles, @column_styles, @column_types)

      end

    end
def row row_number

      if row_number == 0

        cells = []

        if @has_titles

          @column_titles.each do |title|
            cells << title ? title : ''
          end

        end

        cells
        
      else

        @engine.generate(row_number, @columns, @cell_styles, @column_styles, @column_types)

      end

    end
Returns an array of String objects generates by the engine
 attached to this Sheet's Spreadsheet.