to_sentence

# File actionview/lib/action_view/helpers/output_safety_helper.rb, line 43
      def to_sentence(array, options = {})
        options.assert_valid_keys(:words_connector, :two_words_connector, :last_word_connector, :locale)

        default_connectors = {
          words_connector: ", ",
          two_words_connector: " and ",
          last_word_connector: ", and "
        }
        if defined?(I18n)
          i18n_connectors = I18n.translate(:'support.array', locale: options[:locale], default: {})
          default_connectors.merge!(i18n_connectors)
        end
        options = default_connectors.merge!(options)

        case array.length
        when 0
          "".html_safe
        when 1
          ERB::Util.html_escape(array[0])
        when 2
          safe_join([array[0], array[1]], options[:two_words_connector])
        else
          safe_join([safe_join(array[0...-1], options[:words_connector]), options[:last_word_connector], array[-1]], nil)
        end
      end