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Q = https://leetcode.com/explore/interview/card/top-interview-questions-easy/92/array/549/

== Solution ===

/**
 * @param {number[]} nums
 * @return {number}
 */
var singleNumber = function(nums) {
    // We have used XOR approach to find in the Array
    
    // [4,1,2,1,2],[2,2,1]
    
    if(nums.length <=0) return 0;
      
      var result;
    
      for (var i = 0; i <= nums.length - 1; i++) {
          result ^=nums[i];
      }
      return result;
};