Add solution #226

Author: JoshCrozier

solutions/0226-invert-binary-tree.js

@@ -0,0 +1,23 @@
+/**
+ * 226. Invert Binary Tree
+ * https://leetcode.com/problems/invert-binary-tree/
+ * Difficulty: Easy
+ *
+ * Invert a binary tree.
+ */
+
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} node
+ * @return {TreeNode}
+ */
+var invertTree = function(node) {
+  if (node) [node.left, node.right] = [invertTree(node.right), invertTree(node.left)];
+  return node;
+};