React JS is a popular front-end library that allows developers to build dynamic and interactive user interfaces with ease. As a result, there is an increasing demand for developers with React JS skills, and many companies are looking for candidates who are proficient in this technology.
If you are preparing for a React JS interview, you need to be well-versed in the concepts, principles, and best practices related to this library. In this article, we have compiled a list of frequently asked React JS interview questions that can help you ace your next interview.
Table of Contents
1. What is React JS?
2. What are the key features of React JS?
3. What is JSX in React JS?
4. What are React components?
5. What is the difference between state and props in React JS?
6. What is the virtual DOM in React JS?
7. What is the purpose of Redux in React JS?
8. What is React Router?
9. What is the role of Redux middleware?
10. What is the significance of React Fiber?
1. What is React JS?
React JS is an open-source front-end library developed by Facebook for building user interfaces. It is used to create dynamic and responsive web applications with reusable UI components.
2. What are the key features of React JS?
The key features of React JS include:
- Virtual DOM for efficient rendering
- Reusable UI components for code reusability
- One-way data binding for easy data management
- JSX for easy integration of HTML and JavaScript
- React Native for building mobile applications
3. What is JSX in React JS?
JSX is a syntax extension for JavaScript that allows developers to write HTML-like code in their JavaScript files. It enables easy integration of HTML and JavaScript, making it easier to create UI components in React JS.
4. What are React components?
React components are reusable UI elements that can be used to build user interfaces. They can be divided into two types: functional components and class components.
5. What is the difference between state and props in React JS?
State and props are both used for data management in React JS, but there is a key difference between them. The state is used to manage data within a component, while props are used to pass data from one component to another.
6. What is the virtual DOM in React JS?
The virtual DOM is a lightweight representation of the actual DOM in React JS. It allows React to efficiently update and render the UI without having to make direct changes to the actual DOM, which can be time-consuming and inefficient.
7. What is the purpose of Redux in React JS?
Redux is a state management library for React JS that allows developers to manage the state of their applications in a predictable and centralized way. It helps to avoid the problems associated with scattered and unorganized state management.
8. What is React Router?
React Router is a routing library for React JS that allows developers to build single-page applications with multiple views. It enables navigation between views without having to reload the page, resulting in a more seamless user experience.
9. What is the role of Redux middleware?
Redux middleware allows developers to extend the functionality of Redux by intercepting actions and modifying them before they reach the reducers. It is used for tasks such as logging, handling asynchronous actions, and more.
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