Master programming fundamentals, data structures, and algorithms through hands-on coding challenges with instant feedback.
Start CodingWrite, run, and test code directly in the browser with syntax highlighting, auto-complete, and error detection.
Watch sorting and searching algorithms execute step by step with animated array and tree visualizations.
Solve problems from beginner to advanced with test cases, hints, and multiple solution approaches.
Learn Big-O analysis by comparing algorithm performance on different input sizes.
The algorithm visualizer made sorting algorithms intuitive. I could finally see why merge sort is O(n log n).Alex T., Grade 11
Nexus covers everything my AP CSA students need, from basics to advanced OOP and recursion.Mr. Shah, CS Teacher
Learn variables, control flow, functions, arrays, strings, and object-oriented programming in Java and Python with guided exercises.
Implement and visualize arrays, linked lists, stacks, queues, trees, hash maps, and graphs with animated step-throughs.
Study sorting, searching, recursion, dynamic programming, and graph algorithms with complexity analysis and coding challenges.