[byol-han] WEEK 10 solutions

invert-binary-tree/byol-han.js

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+/**
+ * https://leetcode.com/problems/invert-binary-tree/submissions/1651537941/
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {TreeNode}
+ */
+var invertTree = function (root) {
+  if (root === null) return null;
+
+  // 왼쪽과 오른쪽 자식 노드 바꾸기
+  [root.left, root.right] = [invertTree(root.right), invertTree(root.left)];
+
+  return root;
+};