Create 226.翻转二叉树.js

Author: yinxin630

226.翻转二叉树.js

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+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {TreeNode}
+ */
+var invertTree = function(root) {
+    function dfs(node) {
+        if (!node) {
+            return node;
+        }
+        const { left, right } = node;
+        node.left = invertTree(right);
+        node.right = invertTree(left);
+        return node;
+    }
+    return dfs(root);
+};