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VertexClass courses

Learn to code, visually

Data Structures & Algorithms, Machine Learning and programming courses: clear animations, real code and practice in every lesson.

Data Structures & Algorithms in Python

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Python DSA

Data Structures & Algorithms

18+ hours180+ lessonsCoding exercisesSection quizzes

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VERTEXCLASS81

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Data Structures & Algorithms in Java

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Java DSA

Data Structures & Algorithms

Learn data structures and algorithms visually with Java implementations, animations, complexity analysis, and coding problems.

Data Structures & Algorithms in JavaScript

In production

JS

JavaScript DSA

Data Structures & Algorithms

Learn data structures and algorithms visually with JavaScript implementations, animations, complexity analysis, and coding problems.

Data Structures & Algorithms in C++

In production

C++

C++ DSA

Data Structures & Algorithms

Learn data structures and algorithms visually with C++ implementations, animations, complexity analysis, and coding problems.

Free right now

LeetCode LabVote for the next LeetCode problem and get a video solution with a step-by-step visualization.Vote now →AI DSA Skill Test10 questions in your language. AI finds your weak spots and gives you a study plan.Test my skills →AI Mock InterviewPractice a coding or behavioral interview and get an honest hire or no-hire verdict.Start an interview →AI Resume BuilderTurn rough notes into an ATS-friendly developer resume and download it as a PDF.Build my resume →
Learn algorithms visually

Master Data Structures & Algorithms

Stop memorizing code. See how every algorithm works step by step with animations, clear explanations, real implementations and coding interview problems.

Create free accountHow it works
Binary search · target = 56O(log n)
3
L
8
12
17
23
mid
31
42
56
64
79
R
23 < 56 → search right halfstep 1/2
Programming languages
4
Programming languages
Core DSA topics
12
Core DSA topics
Visual lessons
80+
Visual lessons
For every algorithm
Big O
For every algorithm

The VertexClass Method

From pictureto working code.

Every lesson connects the animation you just watched to the exact lines of code that make it happen — so you understand the logic, not just the syntax.

  • ✓Visual algorithm animations
  • ✓Clean real-world implementations
  • ✓Time & space complexity for every solution
  • ✓Coding interview problems
binary_search.py
1def binary_search(arr, target):
2    left, right = 0, len(arr) - 1
3    while left <= right:
4        mid = (left + right) // 2
5        if arr[mid] == target:
6            return mid
7        if arr[mid] < target:
8            left = mid + 1
9        else:
10            right = mid - 1
11    return -1

Curriculum

Everything you need, in the right order

Twelve core topics that take you from Big O notation to dynamic programming.

  1. 01

    Big O & Complexity

    Measure time and space so you can compare solutions with confidence.

  2. 02

    Arrays & Strings

    Two pointers, sliding windows, prefix sums and in-place techniques.

  3. 03

    Linked Lists

    Singly and doubly linked lists, fast & slow pointers, reversal.

  4. 04

    Stacks & Queues

    LIFO and FIFO structures, monotonic stacks and deques.

  5. 05

    Hash Tables

    Hashing, collisions and constant-time lookups explained visually.

  6. 06

    Recursion & Backtracking

    Watch the call stack grow and unwind, then generate every solution.

  7. 07

    Sorting & Searching

    Bubble to merge and quick sort, plus binary search on any space.

  8. 08

    Trees & BSTs

    Traversals, balanced trees and binary search tree operations.

  9. 09

    Heaps & Priority Queues

    Heapify step by step and solve top-k and scheduling problems.

  10. 10

    Graphs

    BFS, DFS, shortest paths, topological sort and union-find.

  11. 11

    Greedy Algorithms

    Learn when the locally best choice leads to the global optimum.

  12. 12

    Dynamic Programming

    Memoization and tabulation, built up one table cell at a time.

How it works

Don't just memorize code.Understand how it works.

01

See it

Watch data structures and algorithms come to life with step-by-step animations.

02

Understand it

Complex ideas are broken into small, clear explanations with the why behind every step.

03

Code it

Move from the concept straight into clean, real implementations in your language.

04

Practice it

Lock it in with exercises and coding interview problems built on the same patterns.

Free account

Join before launch.Get the perks.

Create a free VertexClass account and get a DSA cheatsheet today, the release dates first, and a members-only discount when the courses launch on Udemy.

Create free account →Sign in
  • 📄

    DSA Cheatsheet

    Big O, sorting, graphs and patterns on one page.

  • 📅

    Release dates first

    Know when each language course launches.

  • 🎟️

    Members-only discount

    The best price on Udemy, just for members.

  • 🗳️

    Shape the course

    Vote on topics before they are recorded.

FAQ

Frequently asked questions

What is VertexClass?+

VertexClass is an online learning platform that teaches data structures and algorithms visually. Every concept is shown with step-by-step animations, explained in plain language, and then implemented in real code.

Which programming languages can I learn DSA in?+

Courses are available in Python, Java, JavaScript and C++. The concepts are the same, so you can pick the language you use at work, at university or in coding interviews.

Do I need prior experience with algorithms?+

No. You only need to know the basics of one programming language — variables, loops and functions. The courses start from Big O notation and build up to graphs and dynamic programming.

Will this help me prepare for coding interviews?+

Yes. Each topic ends with practical coding problems based on common interview patterns such as two pointers, sliding window, BFS/DFS, backtracking and dynamic programming.

Why learn algorithms visually?+

Seeing how pointers move, how a tree rebalances or how a DP table fills in makes the logic stick. Instead of memorizing code, you understand why it works — and can write it yourself.

VertexClass

Master the fundamentals.

Learn data structures and algorithms through visual explanations, real code, and practical problems.

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