1470-shuffle-the-array.js

/**
 * @param {number[]} nums
 * @param {number} n
 * @return {number[]}
 */
const shuffle = function(nums, n) {
  const res = []
  for(let i = 0; i < n; i++) {
    res.push(nums[i], nums[i + n])
  }
  return res
};