Solution.js

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