LeetCode: Sum Of All Subset Xor Totals Solution

1/**
2 * @param {number[]} nums
3 * @return {number}
4 */
5var subsetXORSum = function (nums) {
6  let res = 0
7  const N = nums.length
8
9  const recursion = (currentIndex, sum) => {
10    res += sum
11    for (let i = currentIndex; i < N; i++) {
12      sum ^= nums[i]
13      recursion(i + 1, sum)
14      sum ^= nums[i]
15    }
16  }
17
18  recursion(0, 0)
19
20  return res
21}