Create 129-sum-root-to-leaf-numbers.js

Author: everthis

129-sum-root-to-leaf-numbers.js

@@ -0,0 +1,32 @@
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+const sumNumbers = function(root) {
+    const sum = []
+    rec(root, '', sum)
+    return sum.reduce((ac, el) => ac + el, 0)
+};
+
+function rec(node, str, arr) {
+    if (node == null) {
+        arr.push(+str)
+        return
+    }
+    if (node.left !== null) {
+      rec(node.left, str + node.val, arr)
+    }
+    if (node.right !== null) {
+       rec(node.right, str + node.val, arr)
+    }
+    if (node.left === null && node.right === null) {
+        arr.push(+(str + node.val) )
+    }
+}