Simple and Easy to understand solution Javascript


  • 0
    N
    var addTwoNumbers = function(l1, l2) {
       let head;
       let result;
       let carry = 0;
       
       while (l1 || l2 || carry) {
           let sum = 0;
           let d1 = l1 ? l1.val : 0;
           let d2 = l2 ? l2.val : 0;
           
           sum = d1 + d2;
           
           if (carry) {
               sum = sum + carry;
               carry = 0;
           }
           
           if (sum > 9) {
               sum = sum % 10;
               carry = 1;
           }
           
           if (!head) {
               head = new ListNode(sum);
               result = head;
           } else {
               result.next = new ListNode(sum);
               result = result.next;
           }
           
           l1 = l1 ? l1.next : null;
           l2 = l2 ? l2.next : null;
       }
       
       return head;
    };
    

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