1470--shuffle-the-array.js

// Given the array nums consisting of 2n elements in the form [x1,x2,...,xn,y1,y2,...,yn].
// Return the array in the form [x1,y1,x2,y2,...,xn,yn].

// --- Examples
// Input: nums = [2,5,1,3,4,7], n = 3
// Output: [2,3,5,4,1,7]
// Explanation: Since x1=2, x2=5, x3=1, y1=3, y2=4, y3=7 then the answer is [2,3,5,4,1,7].
// Input: nums = [1,2,3,4,4,3,2,1], n = 4
// Output: [1,4,2,3,3,2,4,1]
// Input: nums = [1,1,2,2], n = 2
// Output: [1,2,1,2]

// --- Constraints
// 1 <= n <= 500
// nums.length == 2n
// 1 <= nums[i] <= 10^3

/**
 * @param {number[]} nums
 * @param {number} n
 * @return {number[]}
 */
var shuffle = function (nums, n) {
  const shuffled = Array(nums.length);

  for (let i = 0; i < nums.length; i++) {
    shuffled[2 * i] = nums[i];
    shuffled[2 * i + 1] = nums[i + n];
  }

  return shuffled;
};