LazyCoder

Traverse a Linked List

Learn the simplest linked list loop correctly and understand what each move to next actually means.

Author and page trust

Written by Vignesh Reddy Julakanti.

Founder of Engineering Animuthyam.

Published: 2026-03-22. Updated: 2026-04-02.

This page is written for learners who need visual, interview-oriented linked list explanations rather than a short definition.

Learning outcomes

  • Follow the traversal loop from head to null.
  • Understand why null is the correct stop condition.
  • Build confidence before solving more advanced linked list problems.

Why this page matters

Traversal is the base pattern behind search, counting, printing, and many update operations. If traversal feels uncertain, every later problem becomes slower and more error-prone.

How to read the loop

The loop does not jump through memory magically. Each assignment moves the cursor from one node object to the next link stored inside the current node. The tool makes that movement explicit.

What strong learners notice early

They separate the stable entry point from the moving cursor. That small distinction prevents many beginner mistakes and becomes essential once the traversal starts to update nodes instead of just reading them.

Worked example

  1. Create A -> B -> C and set temp to head.
  2. Visit the current node before moving temp to temp.next.
  3. Stop when temp becomes null because there is no next node to follow.

When to use this tool

  • Printing or inspecting every node in a singly linked list.
  • Preparing for counting, searching, or validation tasks.
  • Learning the shared loop shape behind many linked list questions.

Edge cases to review

  • A null head where the loop should not execute at all.
  • A single-node list where the body executes once.
  • A loop that advances too early and skips the current node data.

Interview variants

  • Print or collect all node values.
  • Count the number of nodes in the list.
  • Stop early when a target node or value is found.

Practice checklist

  • Keep head unchanged and move a separate cursor.
  • Check the current node before updating the cursor.
  • Explain exactly why null is the correct stop condition.
  • Repeat the traversal on an empty list and a single-node list.

FAQ

Should head move during traversal?

Usually no. Keep head as the original entry point and use a separate cursor such as temp or current.

Why is null part of the model?

Null marks the end of the chain. If you do not model the end explicitly, your loop logic becomes ambiguous.