Frontend interview quizzes

Quizzes that train interview instincts.

Practice the fast reasoning questions that expose mental models: predict outputs, identify hidden costs, and explain why one answer is better than another.

JavaScript TrapsClosures, promises, this, coercion, async ordering, and output prediction.Practice JavaScript->React Mental ModelsHooks, render cycles, effects, memoization, reconciliation, and state ownership.Practice React->Time Complexity DojoBig-O reasoning for loops, recursion, sorting, heaps, hash maps, graph/tree traversal.Practice Big-O->TypeScript Edge CasesInference, narrowing, utility types, generics, tuples, and API boundary safety.Practice TypeScript->