JSFiddle - React, Tailwind, and code Playground

HTML

<table id="test" border="1">
    <tr>
        <td>test1</td>
        <td>test2</td>
        <td>test3</td>
    </tr>
      <tr>
          <td>test1</td>
          <td>test2</td>
          <td>test5</td>
    </tr>
    <tr>
        <td>test6</td>
        <td>test2</td>
        <td>test5</td>
    </tr>
      <tr>
              <td>test6</td>
              <td>test6</td>
              <td>test9</td>
        </tr>
    </table>

JavaScript

alert("before change");
arr = [];
$('#test td').each(function(){
    key = "" + $(this).index() + $.trim($(this).text());
       if(arr.indexOf( key ) == -1)
           arr.push(key );
       else
           $(this).text('')    
});