1486. XOR Operation in an Array

Given an integer n and an integer start.
Define an array nums where nums[i] = start + 2*i (0-indexed) and n == nums.length.
Return the bitwise XOR of all elements of nums.

• Example 1:
  Input: n = 5, start = 0
  Output: 8
  Explanation: Array nums is equal to [0, 2, 4, 6, 8] where (0 ^ 2 ^ 4 ^ 6 ^ 8) = 8.
  Where "^" corresponds to bitwise XOR operator.

• Example 2:
  Input: n = 4, start = 3
  Output: 8
  Explanation: Array nums is equal to [3, 5, 7, 9] where (3 ^ 5 ^ 7 ^ 9) = 8.

• Example 3:
  Input: n = 1, start = 7
  Output: 7

• Example 4:
  Input: n = 10, start = 5
  Output: 2

var xorOperation = function(n, start) {  
    let result = 0;
    for(let i = 0; i < n; i++) {
      result ^= start + 2*i;
    }
  
    return result;
};

var xorOperation = function(n, start) {  
  return new Array(n).fill(start, 0, n).reduce((acc, cur, idx) => acc^(start + 2*idx), 0);
};