code: def join_as_series(options = {})
        if defined?(I18n)
          default_delimiter       = I18n.translate(:'series_joiner.default_delimiter',       :locale => options[:locale])
          default_final_delimiter = I18n.translate(:'series_joiner.default_final_delimiter', :locale => options[:locale])
          default_conjunction     = I18n.translate(:'series_joiner.default_conjunction',     :locale => options[:locale])
        else
          default_delimiter       = ', '
          default_final_delimiter = ''
          default_conjunction     = ' and '
        end
  
        delimiter = options[:delimiter] || default_delimiter
        final_delimiter = options[:final_delimiter] || default_final_delimiter
        conjunction = options[:conjunction] || default_conjunction
  
        sz = self.size
        if sz > 0
          r = self[0]
          if sz > 1
            if sz > 2
              for i in 1..(sz - 2)
                r += delimiter + self[i]
              end
              r += final_delimiter
            end
            r += conjunction + self[sz - 1]
          end
        end
        return r
      end
docs: Joins items in an array together in a grammatically correct manner.
  
   Options:
   * `delimiter` - inserted between items, except for the final two (default: ', ')
   * `final_delimiter` - inserted between the final two items (if > 2), but before the conjunction (default: '')
   * `conjunction` - inserted between the final two items (default: ' and ')