boxgames1 · June 29, 2018 11:24
diff --git a/BinaryTreePostorder.js b/BinaryTreePostorder.js
 postorder(node, fn) {
  if (node !== null) {
    this.postorder(node.left, fn);
    this.postorder(node.right, fn);
    fn(node);
  }
 }
	postorder(node, fn) {
	if (node !== null) {
	this.postorder(node.left, fn);
	this.postorder(node.right, fn);
	fn(node);
	}
	}