ByteKata

Build practical data structures and algorithms skills with focused coding challenges. ByteKata takes you from approachable warm-ups to demanding interview-style problems while keeping your work organized in a distraction-free mobile workspace. Solutions are written and tested in Dart. PRACTICE INTERVIEW SKILLS - Solve 52 challenges organized into 13 focused chapters - Progress through beginner, easy, medium, and hard difficulty - Study arrays, strings, hashing, linked structures, stacks, heaps, trees, binary search trees, graphs, backtracking, dynamic programming, sliding windows, and more - Learn frequently asked patterns alongside less familiar techniques worth knowing STAY FOCUSED ON MOBILE - Move quickly between the problem, code editor, and test results - Keep Run and Submit within reach while you write code - Return directly to the relevant source location when an error includes a line and column - Preserve your code and place as you move between sections WRITE, RUN, AND DEBUG - Work in a purpose-built editor with line numbers and syntax highlighting - Run visible tests or create custom test cases with JSON inputs - Compare actual and expected results, then reveal hidden test details when needed - Keep diagnostic print output separate from the returned answer - Investigate compile and runtime errors with available line and column details - Watch supported solutions execute step by step LEARN AS YOU GO - Use a concise Dart reference for variables, conditions, loops, strings, character codes, lists, maps, collection methods, sorting, custom comparators, math functions, and more - Reveal progressive hints only when you ask for them - Unlock a worked explanation and reference solution after completing a challenge - Move freely between the challenge workspace and the Dart reference KEEP YOUR WORK - Save progress and code drafts locally - Export or import progress and saved code as a JSON backup - Recheck every saved solution after evaluator updates - Practice offline after installation without creating an account FREE AND PREMIUM ACCESS The first challenge in every chapter is included. A single optional non-consumable Premium purchase unlocks the remaining challenges in all current and future chapters. Previous purchases can be restored from Settings. ByteKata is designed for deliberate practice: understand the problem, form an approach, test the edge cases, and refine the code.