anchor.diff:    // - - - - - - - - - - - - - - - - - - - - - - - -
     const sortedDiffs = (diffs) => {
       let filenames = [];
  -    $.each(diffs, (_, diff) => {
  -      filenames.push(diffFilename(diff));
  -    });
  +    diffs.forEach(diff => filenames.push(diffFilename(diff)));
       // ensure filenames appear in the same order as kata/edit page
       const sorted = cd.sortedFilenames(filenames);
       const diffFor = (filename) => {
  
positive.code:       }
      };
      let result = [];
      $.each(sorted, (_, filename) => {
        result.push(diffFor(filename));
      });
      return result;
    };
  
  
negative.code:   const makeDiffFilenames = (diffs) => {
      let html = '<table class="filenames">';
      html += makeIconHeadings();
      sortedDiffs(diffs).forEach(diff => {
        if (isTrueFile(diff)) {
          html += makeDiffTr(diff);
        }
  