LeetCode: Rotate Image Solution

1/**
2 * @param {number[][]} matrix
3 * @return {void} Do not return anything, modify matrix in-place instead.
4 */
5var rotate = function (matrix) {
6  const N = matrix.length
7  const M = matrix[0].length
8  matrix.reverse()
9  for (let i = 0; i < N; i++) {
10    for (let j = i + 1; j < M; j++) {
11      ;[matrix[i][j], matrix[j][i]] = [matrix[j][i], matrix[i][j]]
12    }
13  }
14  return matrix
15}