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#1929 - Concatenation of Array
Problem Description
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`.
Solution
/**
* @param {number[]} nums
* @return {number[]}
*/
var getConcatenation = function(nums) {
return [...nums, ...nums];
};