Binary Tree Postorder Traversal Visualizer & Step-by-Step Algorithm Solution

Visit binary tree nodes in Left -> Right -> Root order for bottom-up calculation and subtree evaluation.

Category: trees | Difficulty: Easy

Tags: DFS, Binary Tree, Postorder, Bottom-up

Binary Tree Postorder Traversal

4
2
1
3
7
6
9
100%
state
result[]
Initialization
1/38
Explanation

Start postorder traversal on binary tree with root: Node(4).

Source Code
1function postorder(node, result = []) {
2 if (!node) return result;
3 postorder(node.left, result); // Recurse Left
4 postorder(node.right, result); // Recurse Right
5 result.push(node.val); // Process Root
6 return result;
7}