1
var singleNumber = function (nums) {
2
  let hash = {};
3
  for (let num of nums) {
4
    if (hash[num] === undefined) hash[num] = 1;
5
    else hash[num]++;
6
  }
7

8
  let result = [];
9
  for (let [key, value] of Object.entries(hash)) {
10
    if (value == 1) result.push(key);
11
  }
12
  return result;
13
};