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Preparing your coding drills
Your complete coding interview prep toolkit
Practice 8,731+ problems across 24 languages. Build muscle memory with drills, test yourself with quizzes, study cheatsheets, and rehearse with AI mock interviews.
Select a programming language to start practicing
+ TypeScript in Drill Mode
798 problems
+ JavaScript in Drill Mode
810 problems
491 problems
497 problems
239 problems
447 problems
369 problems
506 problems
181 problems
326 problems
190 problems
275 problems
347 problems
312 problems
427 problems
66 problems
346 problems
316 problems
100 problems
386 problems
566 problems
79 problems
86 problems
417 problems
154 problems
Practice coding interviews with an AI interviewer. Choose between algorithm problems and system design questions.
72 algorithm problems • 28 system design questions • Two interview modes
Test your ability to recognize algorithm patterns from LeetCode-style problems. Identify the right approach before coding.
170 problems · Multiple patterns · Timed challenges
Master regular expressions with interactive challenges. Practice live pattern matching, drill under time pressure, or experiment freely in the playground.
115 patterns · Drill · Practice · Playground
Practice React hooks, Vue Composition API, Angular decorators, and vanilla JavaScript DOM patterns. Build muscle memory for real frontend development.
938 challenges · 4 frameworks · Code drills & quizzes
Multiple ways to master your chosen language
Practice method implementations with guided exercises. Build muscle memory through repetition.
Test your knowledge with multiple choice questions. Identify gaps in your understanding.
Browse comprehensive documentation and examples. Quick lookup for syntax and patterns.
Practice algorithms and system design with an AI interviewer. Get real-time feedback and hints.
Master regular expressions with live pattern matching. Drill, practice, or experiment in the playground.