1929-concatenation-of-array.js

/**
 * 1929. Concatenation of Array
 * https://leetcode.com/problems/concatenation-of-array/
 * Difficulty: Easy
 *
 * Given an integer array `nums` of length `n`, you want to create an
 * array `ans` of length `2n` where `ans[i] == nums[i`] and
 * `ans[i + n] == nums[i]` for `0 <= i < n` (0-indexed).
 *
 * Specifically, `ans` is the concatenation of two `nums` arrays.
 *
 * Return the array `ans`.
 */

/**
 * @param {number[]} nums
 * @return {number[]}
 */
var getConcatenation = function(nums) {
  return [...nums, ...nums];
};