React.js interviews: questions you’re strugle to answer

You’ve spent months building React apps, watched every tutorial, and committed thousands of lines of JSX. But then it hits you — the interview.

Suddenly, you’re staring at a question that feels like it came from another planet: “What is reconciliation in React?”

For that reason, I created Mastering React.js Interviews — a no-fluff guide built from real-world interview questions, gathered from tech companies, startups, and actual hiring rounds.

Mastering React.js Interviews: From 0 to Hero

Based on 350+ real-world front-end interviews, it delivers the most relevant technical questions asked by top companies — along with clear, practical answers that help you build confidence, deepen your React.js knowledge, and prove your skills where it matters most.

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…