add two numbers

Author: mgable

addTwoNumbers.js

@@ -0,0 +1,41 @@
+var addTwoNumbers = function(l1, l2) {
+    let myList = new ListNode(0),
+        l1number = [],
+        l2number = [],
+        pointer = myList
+    
+    while(l1 || l2){
+      if (l1){
+        l1number.push(l1.val)
+        l1 = l1.next
+      }
+      if (l2){
+        l2number.push(l2.val)
+        l2 = l2.next
+      }
+    }
+
+    let index = 0, total = [], carry
+
+    while (index < l1number.length || index < l2number.length){
+      let sum = (l1number[index] || 0) + (l2number[index] || 0)
+
+      if (sum >= 10){
+        if (l1number[(index + 1)] !== undefined){
+          l1number[(index + 1)] += 1
+        } else {
+          l1number.push(1)
+        }
+      }
+      total.unshift(sum % 10)
+      index++
+    }
+
+    while(total.length){
+      let node = new ListNode(total.pop())
+      pointer.next = node
+      pointer = node
+    }
+
+    return myList.next
+};