What’s Inside

• Core React Concepts – JSX, Virtual DOM, props, state, and component structure (React.js v19)
• Hooks Deep Dive – useState, useEffect, useReducer, useRef, useMemo, and more (React.js v19)
• Performance Optimization – Avoid re-renders, lazy loading, memoization, and profiling (React.js v19)
• Component Design & Reusability – HOCs, render props, children, and Fragments (React.js v19)
• Forms & Event Handling – Controlled/uncontrolled components, validation, synthetic events (React.js v19)
• Styling Techniques – CSS Modules, Tailwind CSS (v4.0), clsx (v2.1), and scalable styling strategies
• Routing – Nested routes, useParams, useSearchParams, and route protection (React Router v7.4)
• Error Handling – Error boundaries, debugging practices, graceful fallbacks (React.js v19)
• Global State Management – Context API (React 19), Redux Toolkit (v2.6), Zustand (v5.0), and best practices

Who This Book Is For ?

• Beginner Developers – If you're new to React.js, this book will build a strong foundation, helping you understand the core concepts and prepare for entry-level technical interviews.
• Intermediate Developers – If you already have experience with React.js, this book will deepen your knowledge, reinforce best practices, and prepare you for mid-level interviews.

What Makes This Book Different?

• Real Insights from a Technical Lead – Gain first-hand knowledge from a Front-end expert who has conducted 350+ React.js interviews.
• Hands-On Learning – Work through practical coding exercises and real-world scenarios to apply what you learn.
• Common Interview Pitfalls & Best Practices – Learn the mistakes that trip up candidates and how to stand out in interviews.
• Up-to-Date with React 19 & Latest Tools – Covers React.js 19, React Router v7.4, Redux Toolkit v2.6, Tailwind CSS v4.0, Zustand v5.0, and more.

What’s Inside Each Question?

Every question follows a structured format designed to maximize your understanding and retention:

• Detailed Answer – A clear and in-depth explanation of the concept.
• Short Answer – A quick summary for rapid review.
• Code Examples – Practical TypeScript-based examples demonstrating real-world usage.
• Common Pitfalls & Best Practices – Learn what mistakes to avoid and how to write optimal code.
• Fun Facts – Insightful historical or technical trivia related to React.js.
• Resources for Further Learning – Links to official documentation, articles, and other trusted sources to dive deeper.