const rotateArray = (nums, k) => { let a = []; for (let i = 0; i < nums.length; i++) { a[(i + k) % nums.length] = nums[i]; } for (let i = 0; i < nums.length; i++) { nums[i] = a[i]; } return nums; } console.log(rotateArray([1,2,3,4,5,6,7], 3));