https://leetcode.com/problems/rotate-image/

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/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var rotate = function(matrix) {
    for (let i = 0; i < matrix.length; i++) {
        for (let j = i + 1; j < matrix[i].length; j++) {
            let t = matrix[i][j]
            matrix[i][j] = matrix[j][i]
            matrix[j][i] = t
        }
        matrix[i].reverse()
    }
};