const rotate = (matrix, n) =>{
  for(let layer=0; layer<n; layer++){
    let first =layer;
    let last = n - layer-1;
    for(let i=first; i<last;i++){

      let offset = i-first;
      //save top
      let top = matrix[first][i];
      //left -> top
      matrix[first][i] = [last-offset][first];
      //bottom-left
      matrix[last-offset][first] =matrix[last][last-offset];
      //right to bottom
      matrix[last][last-offset] =matrix[i][last]

      //top - right
      [matrix][i][last] =top;


    }[![enter image description here][1]][1]
  }
}

rotate(matrix,3);