to_sentence

# File actionview/lib/action_view/helpers/output_safety_helper.rb, line 41
      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]])
        end
      end