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DOM : Sortable table

<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <style>
  table {
     border-collapse: collapse;
   }
   th, td {
     border: 1px solid black;
     padding: 4px;
   }
   th {
     cursor: pointer;
   }
   th:hover {
     background: yellow;
   }
</style>

</head>
<body>
  <table id="grid">
      <thead>
        <tr>
          <th data-type="number">Age</th>
          <th data-type="string">Name</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td>5</td>
          <td>John</td>
        </tr>
        <tr>
          <td>2</td>
          <td>Pete</td>
        </tr>
        <tr>
          <td>12</td>
          <td>Ann</td>
        </tr>
        <tr>
          <td>9</td>
          <td>Eugene</td>
        </tr>
        <tr>
          <td>1</td>
          <td>Ilya</td>
        </tr>
      </tbody>
    </table>

  <script>

grid.onclick = function(e) {
  if(e.target.tagName != 'TH') return;
  //when table head is clicked, we sort
  let th = e.target; // so that our targets are only THs
  sortGrid(th.cellIndex, th.dataset.type);
};

//iteration to see what is in each array item
// for(let i=0; i<rowsArray.length; i++){
//   alert(rowsArray[i].innerHTML);
// }

function sortGrid(colNum, type){
  let tbody = grid.querySelector('tbody');
  let rowsArray = Array.from(tbody.rows);
  let compare;

  switch(type){
  case 'number' :
      compare = function(rowA, rowB) {
        return rowA.cells[colNum].innerHTML - rowB.cells[colNum].innerHTML;
        };//it returns smaller one first
    //rowA.cells[]
        break;

    case 'string':
          compare = function(rowA, rowB) {
            return rowA.cells[colNum].innerHTML > rowB.cells[colNum].innerHTML ? 1 : -1;
            //bigger num of ASCII means prepending alphabet
            //so the false one(-1-) should be ahead of true one(1)
            //the same :
            //return rowA.cells[colNum].innerHTML < rowB.cells[colNum].innerHTML ? -1 : 1;
          };
          break;
  }
  rowsArray.sort(compare);
  //sort by the function compare
  //rowsArray has 5 elems
  tbody.append(...rowsArray);
  //appends every elems into
  //append puts the argument at the end of selection, tbody
  //with it from row0 col0, new order of elems overwrite???????
  //BUT WHY DOES APPEND WORK AS OVERWRITTING?????
  //alert(tbody.innerHTML);
}
  </script>
</body>
</html>

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