anchor.diff:        }
       };
       let result = [];
  -    $.each(sorted, function(_, filename) {
  +    $.each(sorted, (_, filename) => {
         result.push(diffFor(filename));
       });
       return result;
  
positive.code:       const tag = $(this).data('tag');
        $(this)
          .attr('title', toolTip(index))
          .click(function() { show(tag); });
      });
    };
  
  
negative.code:   // - - - - - - - - - - - - - - - - - - - - - - - -
  
    const reviewRefresh = () => {
      const reviewParams = {
              id: param.id,
          avatar: param.avatar,
         was_tag: param.wasTag,
         now_tag: param.nowTag,
        filename: param.filename
      };
      $('.ui-dialog').addClass('busy');
      $.getJSON('/differ/diff', reviewParams, (data) => {
        $('.ui-dialog').removeClass('busy');
        param = data;
        refreshDiffCheckBox();
        refreshTrafficLights();
        refreshAvatarControls();
  