LeetCode 144. Binary Tree Preorder Traversal (Iterative Approach) in JavaScript

00:00 - Introduction
00:07 - Whiteboard Walkthrough
04:28 - Edge Cases
07:44 - JavaScript Code Implementation
12:25 - Conclusion

Welcome to LeetCode LevelUp!

In today’s video, we’ll tackle the Preorder Traversal of a Binary Tree using an iterative approach in JavaScript. This solution is ideal for understanding tree traversal without recursion, effectively managing a stack for precise ordering.

We’ll cover:

The problem statement and a stack-based approach to solve it iteratively.
A whiteboard demonstration to break down each step of the traversal.

Detailed JavaScript code implementation that leverages stack operations to maintain correct node order.

Important edge cases, like empty nodes and skewed trees with only one branch.

Time Complexity: O(N) where N is the number of nodes, as each node is visited once.

Space Complexity: O(N) for the stack in the worst case for an unbalanced tree.

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