var rotate = function (matrix) {
  const len = matrix.length - 1;
  const temp = Array.from(Array(len + 1), () => Array(len + 1).fill(null));
  for (let i = 0; i <= len; i++) {
    for (let j = 0; j <= len; j++) {
      temp[i][j] = matrix[len - j][i];
    }
  }
  return matrix;
};

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */

const swap = (arr, x, y, a, b) => {
  let temp = arr[x][y];
  arr[x][y] = arr[a][b];
  arr[a][b] = temp;
};

var rotate = function (matrix) {
  const len = matrix.length - 1;
  for (let i = 0; i <= len / 2; i++) {
    for (let j = 0; j <= len; j++) {
      swap(matrix, i, j, len - i, j);
    }
  }
  for (let i = 0; i <= len; i++) {
    for (let j = i + 1; j <= len; j++) {
      swap(matrix, i, j, j, i);
    }
  }
};