Other Companies (Name Not Shared) React.js Interview Questions for Not specified
Shared question set for Not specified of experience, Frontend engineer (React, Next.js). Topics and wording follow the supplied notes; these are questions, not official company guidance.
- Explain the difference between var, let and const in JavaScript.
- What are closures in JavaScript and how do you use them?
- How do you handle asynchronous code using async/await and Promises?
- Explain the virtual DOM in React and how it improves performance.
- How do you manage state in React using useState and useReducer?
- Explain the difference between props and state in React.
- How do you implement the Context API for global state management?
- How do you optimize React applications for performance?
- Explain the difference between class components and functional components.
- How do you handle forms and validation in React?
- What are React hooks and how do you create custom hooks?
- How do you implement routing in React using react-router-dom?
- Explain the concept of server-side rendering (SSR) in Next.js.
- How do you fetch data in Next.js using getStaticProps and getServerSideProps?
- Explain the difference between REST APIs and GraphQL.
- How do you implement API calls and error handling in React?
- How do you handle authentication and authorization in frontend apps?
- Explain CSS Grid vs Flexbox and when to use each.
- How do you implement responsive design in modern web apps?
- How do you optimize web performance and reduce load times?
- Explain Progressive Web Apps (PWAs) and their benefits.
- How do you implement lazy loading and code splitting in React?
- What are web accessibility standards (WCAG) and how do you implement them?
- How do you write unit tests in React using Jest and React Testing Library?
- Explain end-to-end testing using Cypress or Selenium.
- How do you handle version control and collaboration using Git?
- Explain the difference between npm and yarn.
- How do you debug JavaScript and React applications effectively?
- Explain the concept of component-driven architecture.
- Build a complete frontend application that consumes APIs.