REACT INTERVIEW QUESTIONS & ANSWERS

Preparing for a React interview? Here are some commonly asked questions with short answers 👇

🔹 What is React?

A JavaScript library for building user interfaces, especially single-page applications.

🔹 What are components in React?

Reusable, independent pieces of UI. Two types: Functional and Class components.

🔹 What is JSX?

A syntax extension that allows writing HTML-like code inside JavaScript.

🔹 What is Virtual DOM?

A lightweight copy of the real DOM that improves performance by updating only changed elements.

🔹 What are props?

Inputs passed to components to display dynamic data.

🔹 What is state?

An object that stores dynamic data and controls component behavior.

🔹 Difference between state and props?

Props are read-only; state is mutable and managed within the component.

🔹 What are React Hooks?

Functions like useState, useEffect that let you use state and lifecycle features in functional components.

🔹 What is useEffect?

A hook used to perform side effects like API calls, subscriptions, etc.

🔹 What is key in React lists?

A unique identifier to help React track elements efficiently.

🔹 What is lifting state up?

Moving state to a common parent component to share data between components.

🔹 What is React Router?

A library for navigation in React applications.

🚀 React Interview Questions & Answers

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