Free Training
Practice frontend skills with focused drills.
DevDrills training is built around practical frontend topics: JavaScript, TypeScript, React, Redux, and algorithms. Start with free tracks, then go deeper as premium training is added later.
JavaScript
Coming soonPractice closures, async code, prototypes, arrays, objects, promises, and common interview questions.
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TypeScript
Coming soonLearn types, interfaces, generics, narrowing, utility types, and practical type-safe patterns.
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React
Coming soonPractice components, hooks, rendering behavior, memoization, state, effects, and real interview scenarios.
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Redux
Coming soonUnderstand Redux Toolkit, slices, selectors, async logic, middleware, and predictable state management.
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Algorithms
PlannedPractice arrays, strings, maps, recursion, sorting, searching, and problem-solving patterns.
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Featured drills
Practical frontend explanations
Authentication
How JWT decoding works
Learn JWT structure, payloads, Base64URL decoding, expiration claims, and how tokens are used in frontend apps.
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JavaScript
How deep object comparison works in JavaScript
Learn why object comparison is tricky, how deep comparison works, and how to compare nested objects and arrays.
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How it will work
Short lessons, focused questions, and practical challenges.
Learn
Read a short explanation of the topic without unnecessary theory.
Practice
Answer focused questions and small coding-style challenges.
Improve
Return to weak topics and repeat until the concept feels natural.