React | tech2026

📄️React Overview

React interview preparation — hooks, patterns, state management, rendering, testing, and more.

📄️React Accessibility - ARIA and Testing

Question 1: How do you make React applications accessible with ARIA, semantic HTML, and keyboard navigation?

📄️React Animations & Performance

Question 1: How to implement animations in React? (CSS transitions, Framer Motion, React Spring)

📄️React Build Optimization

Focus: Webpack/Vite optimization, bundle analysis, and build performance

📄️React Components - Basics

Question 1: What are React components and what's the difference between functional and class components?

📄️React 18 Concurrent Features

Question 1: What are useTransition and useDeferredValue? When to use each?

📄️React 18 Concurrent Features (Continued)

Question 1: What is Suspense and how does it work with concurrent rendering?

📄️React Context API

Question 1: How to create and use Context API for global state?

📄️React DevTools and Debugging

Question 1: How to use React DevTools for debugging?

📄️React Synthetic Event System

Question 1: How does React's synthetic event system work?

📄️React Event Delegation and Pooling

Question 1: What are event delegation and event pooling in React?

📄️React Fiber Architecture

Question 1: What is React Fiber architecture and why was it created?

📄️React Forms - Controlled Components

Question 1: What are controlled vs uncontrolled components in React forms?

📄️React Forms - Validation

Question 1: How to implement form validation in React? (React Hook Form, Yup, Zod)

📄️React Fragments & Keys

Question 1: What are React Fragments and when to use them?

📄️React Hooks - useState

Master the useState hook

📄️React Hooks - useEffect

Master the useEffect hook

📄️React Hooks - useContext and useReducer

Master useContext and useReducer for advanced state management patterns

📄️React useEffect Hook

Question 1: How does useEffect work and what is its lifecycle?

📄️React Advanced Hooks

useCallback, useMemo, useRef, useImperativeHandle, useLayoutEffect, useId, and performance optimization hooks.

📄️React Context API and useContext Hook

Question 1: How does useContext work and when should you use it?

📄️React Hooks: useMemo and useCallback

Question 1: What's the difference between useMemo and useCallback? When to use each?

📄️React Hooks - Advanced useRef and Custom Hooks with Refs

Advanced patterns combining useRef with custom hooks

📄️React Hooks - useRef

Question 1: How does useRef work and what are its use cases?

📄️React Hooks - useReducer

Question 1: How does useReducer work and when should you use it over useState?

📄️React Custom Hooks - Advanced Patterns

Question 1: How do you create custom hooks and what are the best practices?

📄️React Custom Hooks - Window Size Tracking

Question 1: How do you create a useWindowSize custom hook that tracks window dimensions?

📄️React Internals - Fiber Architecture

React Fiber architecture and reconciliation basics

📄️React Internals - Reconciliation

React reconciliation algorithm and diffing

📄️React Internationalization (i18n)

Question 1: How do you implement internationalization in React using react-i18next?

📄️React Lazy Loading: Images & Performance Optimization

Question 1: How to implement lazy loading for images in React?

📄️React Lifecycle Methods

Question 1: What are React lifecycle methods and how do they map to hooks?

📄️React Composition Patterns

Question 1: What are component composition patterns in React? (children, render props, slots)

📄️React Patterns: Higher-Order Components (HOCs)

Question 1: What are Higher-Order Components (HOCs) and how to implement them?

📄️React HOC and Render Props - Part A

Higher-Order Components and Render Props patterns

📄️React HOC and Render Props - Part B

Advanced component patterns continued

📄️patterns-02b2-hoc-advanced

Question 1: Slots Pattern

📄️patterns-02b3-hoc-advanced

Question 1: Extensible Styles Pattern

📄️React HOC and Render Props - Part C1

Advanced component patterns continued

📄️patterns-02c2-render-props-advanced

Question 1: Props Getters Pattern

📄️Company React Patterns Guide

Question 1: Pattern Best Practices

📄️React Patterns: Render Props

Question 1: What is the render props pattern and how to implement it?

📄️React Error Boundaries - Error Handling Patterns

Question 1: What are Error Boundaries and how to implement them?

📄️React Patterns: Code Splitting and Lazy Loading

Question 1: How to implement code splitting with React.lazy and Suspense?

📄️React Performance - Basics

React performance fundamentals and optimization basics

📄️React Performance Metrics: Core Web Vitals & DevTools Profiler

Question 1: What are Core Web Vitals and how to measure React app performance?

📄️React Performance - Memoization

React.memo, useMemo, useCallback for optimization

📄️React Portals - Rendering Outside the DOM Hierarchy

Question 1: What are React portals and when should you use them?

📄️Progressive Web Apps (PWA) with React

Question 1: How to build a PWA with React?

📄️Redux Integration with React

Question 1: How does Redux work with React? (useSelector, useDispatch)

📄️React Refs and DOM Access

Question 1: What are refs and when should you use them for DOM manipulation?

📄️React Rendering: Virtual DOM and Reconciliation

Question 1: What is Virtual DOM and how does React use it for rendering?

📄️React Rendering - Optimization

Question 1: How to prevent unnecessary re-renders in React? (React.memo, useMemo, useCallback)

📄️React Router - Routing and Navigation

Question 1: How does React Router work? (BrowserRouter, Routes, Route)

📄️React Router - Data Loaders and Actions

Question 1: What are data loaders and actions in React Router v6.4+?

📄️React Security Practices

Question 1: How to prevent XSS attacks in React?

📄️React SEO Optimization

Question 1: How to optimize React apps for SEO?

📄️React SEO Optimization

Question 1: How to implement dynamic meta tags and Open Graph in React?

📄️React Server Components

Question 1: What are React Server Components and how do they differ from client components?

📄️Server-Side Rendering (SSR) Basics

Question 1: What is SSR and how does it differ from CSR?

📄️React State Management - Context

Context API and state management with Context

📄️React State Management Fundamentals

Question 1: What is state in React and how does it differ from props?

📄️React State Management - Redux and Zustand

Redux, Zustand, and other state management libraries

📄️State Machines in React

Question 1: How to manage complex state logic with state machines? (XState)

📄️React StrictMode

Question 1: What is React StrictMode and why is it important?

📄️React Styling Methods

Question 1: What are different ways to style React components? (CSS Modules, CSS-in-JS, Tailwind)

📄️React Suspense - Data Fetching

Question 1: How does Suspense work for data fetching in React 18+?

📄️React Testing Library - Testing Components

Question 1: How to test React components with React Testing Library?

📄️Testing React Components

React Testing Library, testing hooks, async testing, mocking, and best practices.

📄️Testing React Components - Part 2

Custom hooks testing, renderHook patterns, and advanced testing techniques.

📄️TypeScript Integration with React

Question 1: How to type React components, props, and state?

📄️WebSockets with React

Question 1: How to integrate WebSockets with React?