DSA Example

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  <title>HTML Tutorial</title>
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Guided tutorial track

DSA Tutorial

Learn data structures and algorithms in JavaScript — arrays, hash maps, trees, graphs, recursion and the patterns interviews actually ask about.

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Tutorial overview

Start here, then move through the chapters

This tutorial is designed to be followed in order. Read the chapter, practice with the editor, test your understanding, and move toward completion.

Lessons

Sections

Access

Free

Level

intermediate

Ready to begin?

Start with lesson one and follow the tutorial step by step.

Open first lesson

The learning path

Work through these in order. Each part builds on the one before it, and every part lists what it covers and roughly how long it takes.

Part 1Beginner

DSA Introduction

2 lessons12 min

What Are Data Structures and Algorithms · How to Approach a DSA Problem

Start this part

Part 2Beginner

Big O and Complexity

2 lessons12 min

Big O Notation Explained · Time vs Space Complexity

Start this part

Part 3Beginner

Arrays

2 lessons12 min

Arrays in JavaScript for DSA · Array Traversal Patterns

Start this part

Part 4Beginner

Strings

2 lessons12 min

Strings in JavaScript for DSA · Common String Problems

Start this part

Part 5Beginner

Hash Maps and Sets

2 lessons12 min

Hash Maps and Sets in JavaScript · When a Hash Map Is the Wrong Choice

Start this part

Part 6Beginner

Two Pointers and Sliding Window

2 lessons12 min

The Two Pointer Technique · The Sliding Window Technique

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Part 7Beginner

Stacks and Queues

2 lessons12 min

Stacks in JavaScript · Queues in JavaScript

Start this part

Part 8Beginner

Linked Lists

2 lessons12 min

Linked Lists Explained · Linked List Two Pointer Problems

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Part 9Intermediate

Recursion

2 lessons12 min

Recursion Explained · Turning Recursion Into Iteration

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Part 10Intermediate

Backtracking

2 lessons12 min

Backtracking Explained · Classic Backtracking Problems

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Part 11Intermediate

Sorting

2 lessons12 min

Sorting in JavaScript · Sorting Algorithms You Should Know

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Part 12Intermediate

Searching

2 lessons12 min

Binary Search Explained · Linear Search and When to Use It

Start this part

Part 13Intermediate

Heaps and Priority Queues

3 lessons18 min

Heaps and Priority Queues · Top K Problems · Heap Sort and Streaming Data

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Part 14Intermediate

Trees

3 lessons18 min

Binary Trees Explained · Binary Search Trees · Common Tree Problems

Start this part

Part 15Intermediate

Tries

1 lesson6 min

Tries (Prefix Trees)

Start this part

Part 16Advanced

Graphs

4 lessons24 min

Graphs and How to Represent Them · Graph Traversal: BFS and DFS · Topological Sort …

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Part 17Advanced

Union-Find

1 lesson6 min

Union-Find (Disjoint Sets)

Start this part

Part 18Advanced

Dynamic Programming

4 lessons24 min

Dynamic Programming Explained · Classic DP Problems · 1D Dynamic Programming …

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Part 19Advanced

Greedy

2 lessons12 min

Greedy Algorithms Explained · Greedy vs Dynamic Programming

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Part 20Advanced

Bit Manipulation

1 lesson6 min

Bit Manipulation Basics

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Part 21Advanced

Matrix and 2D Arrays

1 lesson6 min

Matrix Traversal and Manipulation

Start this part

Part 22Advanced

Interview Patterns

2 lessons12 min

Recognising the Pattern · How to Answer in an Interview

Start this part

Your path

Learn it · Practise it · Prepare it · Prove it

01
Learn it
Work through the lessons
46 lessons
Not available yet:
02
Practise it
Build and debug from each lesson
Coming soon
Not available yet:
03
Prepare it
Interview questions, coding and spoken
Coming soon
04
Prove it
Pass the assessment, earn the certificate
Certificate available

What You Will Learn

DSA Introduction

Big O and Complexity

Arrays

Strings

Hash Maps and Sets

Two Pointers and Sliding Window

Stacks and Queues

Linked Lists

Recursion

Practice Live

Read the lesson, edit code in the Try-It editor, and see the result instantly.

Try It Editor Open first lesson

Tutorial Features

Code examples inside chapters

Each topic is supported with practical examples so the tutorial stays easy to follow.

Practice with the Try It Editor

Open the browser editor and test what you just learned without leaving the site.

Quiz for self-check

Use the assessment flow to test whether the chapters are really understood.

Certificate after completion

Complete the learning flow and move toward a verifiable completion certificate.

How to Use This Tutorial

Step 01

Learn the chapter

Follow the lessons in order so each new concept builds on the previous one.

Step 02

Practice the example

Open the Try It Editor and apply the idea immediately while it is fresh.

Step 03

Test your understanding

Use the quiz and progress flow to confirm the topic is really understood.

Step 04

Finish with proof

Complete the tutorial journey and move toward a verifiable certificate.

Complete the tutorial with confidence

Finish the lessons, take the assessment, and move toward a certificate that can be verified on the site. The structure is meant to help you learn, practice, and complete the topic properly.

Certificate verification

Publicly verifiable after successful completion.

Why Learn DSA

Easy to Learn

DSA is explained with beginner friendly chapters and examples.

Essential Skill

Understand the core building blocks before moving into advanced topics.

Build Real Websites

Use each lesson as a practical step toward real web development.