Image rotation

rotate.js

/**
 * @param {number[][]} matrix
 * @return {void} Do not return anything, modify matrix in-place instead.
 */
var rotate = function(matrix) {
    const n = matrix.length;
    for (let i = 0; i < Math.floor(n / 2); i++) {
        for (let j = i; j < n - i - 1; j++) {
            let positions = [
                [j, n - 1 - i],
                [n - 1 - i, n - 1 - j],
                [n - 1 - j, i],
                [i, j]
            ];
            
            let value = matrix[positions[3][0]][positions[3][1]];
            
            for (let pos of positions) {
                const temp = matrix[pos[0]][pos[1]];
                matrix[pos[0]][pos[1]] = value;
                value = temp;
            }
        }
    }
};