title: reversing sub arrays with nested loop Javascript
body: <p>I wants to reverse the array with sub arrays with nested loops. I do not wants to use the reverse function. But every-time I do that I get this a type-error.<br />
  anyways here is my code</p>
  <pre><code>let arr = [[1,2,3],[4,5,6],[7,8,9]];
  
  
  for(let i = arr.length - 1; i &gt; 0; i--)
    {
      for (let j = arr[i].lenght - 1; j &gt; 0; j--)
        {
          console.log(arr[i][j]);
        }
    }
  </code></pre>
  <p>The result should be 9,8,7,6,5,4,3,2,1 but instead I get nothing blank.</p>