Faangprep Logo
Log inStart free
React Curriculum
100% Free Curriculum80 Curriculum ModulesReact 18 & 19 Ready

React Interview Preparation

Progress from fundamentals to FAANG-level frontend engineering. Master React Fiber internals, concurrent rendering, custom hook architectures, web accessibility, and live machine-coding challenges.
Start LearningJump to Machine Coding
Fiber & Reconciliation Traces

Step through Fiber node transitions, double buffering, render vs commit phases, and work loop scheduling.

Output Prediction Quizzes

Tackle tricky interview snippets on state batching, stale closures, effect ordering, and StrictMode execution.

Live Machine-Coding Sandboxes

Build accessible Star Rating, Modal Dialog, Compound Tabs, Typeahead, and Infinite Scroll widgets with tests.

Curriculum Breakdown

16 Progressive Topic Families

Module #01
React Fundamentals for Frontend Interviews

Master core React interview concepts: declarative rendering, JSX compilation, element immutability, conditional rendering, and children slots.

Module #02
State Mechanics, Batching, and Lifecycle Transitions

Understand React state mechanics: memory snapshots, React 18 automatic batching, functional updaters, and lifecycle synchronizations.

Module #03
Core React Hooks: State, Synchronization, and Refs

Master fundamental React hooks: useState lazy init, useEffect synchronization, cleanup lifecycles, race conditions, and mutable useRef containers.

Module #04
Advanced Hooks, Referential Equality, and Stores

Master advanced React hooks: useMemo and useCallback referential equality, useContext pitfalls, useSyncExternalStore, and useImperativeHandle.

Module #05
React Internals: Fiber Architecture and Reconciliation

Deep dive into React internals: Fiber node architecture, reconciliation diffing heuristics, render vs commit phases, and SyntheticEvents.

Module #06
Performance Engineering, Profiling, and Virtualization

Master React performance optimization: React.memo shallow comparisons, composition patterns, list virtualization, and DevTools flamegraphs.

Module #07
Concurrent Rendering, Priority Lanes, and React 19

Master Concurrent React: useTransition, useDeferredValue, priority lanes, and modern React 19 features including use(), useActionState, and useOptimistic.

Module #08
Form Architecture, Modern FormData, and Validation

Core form interview topics: controlled vs uncontrolled inputs, modern FormData submission, schema validation with Zod, and masked inputs.

Module #09
State Architecture, Store Subscriptions, and Server Cache

Evaluate state architectures: state colocation, Context API re-render trade-offs, Zustand selector subscriptions, RTK, and TanStack Query.

Module #10
Advanced Component Design Patterns and Error Boundaries

Advanced React architecture: compound components, HOC vs render props evolution, declarative Error Boundaries, and polymorphic primitives.

Module #11
Type-Safe React: Components, Generics, and Hooks

Master TypeScript in React: typing components and events, hooks, discriminated union reducers, generic tables, and polymorphic as props.

Module #12
Frontend Security, Taint APIs, and Web Accessibility

Production hardening: XSS vectors, dangerouslySetInnerHTML, React 19 taint APIs, keyboard navigation, and focus trapping modals.

Module #13
Server-Side Rendering, Hydration, and Server Components

Master modern rendering: SSR mechanics, hydration mismatch debugging, React Server Components (RSC) boundaries, and streaming Suspense.

Module #14
Unit Testing, Async Mocking, and Debugging Workflows

Master React testing and debugging: React Testing Library query precedence, MSW async mocking, testing custom hooks, and memory leak analysis.

Module #15
Tricky React Output Prediction & Execution Ordering

Practice tricky React output prediction interview questions: batching queues, effect execution orders, memoization identities, and keys.

Module #16
Live Machine Coding Challenges and Custom Hooks

Implement production-ready React components and custom hooks: useDebounce, Star Rating, Modal Dialog, Tabs, Autocomplete, and Infinite Scroll.