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If you are preparing for a React JS interview, you might be wondering what are some of the most commonly asked questions. In this article, we will cover some of the top React JS interview questions that you should be prepared to answer. These questions are commonly asked by employers to assess a candidate’s knowledge and understanding of React JS.

1. What is React JS?

React JS is a popular JavaScript library that is used for building user interfaces. It was developed by Facebook and has gained widespread popularity due to its ease of use and flexibility. React allows developers to create reusable UI components and can be used to build single-page applications.

2. What are the key features of React JS?

Some of the key features of React JS include virtual DOM, JSX syntax, component-based architecture, and the ability to create reusable components. React also has a strong community and ecosystem, which makes it easy to find support and resources.

3. What is JSX?

JSX is a syntax extension for JavaScript that allows developers to write HTML-like code within their JavaScript files. JSX makes it easier to write and understand React components, as it allows developers to mix HTML and JavaScript together.

4. What is the difference between state and props in React JS?

State and props are both used to pass data to a component in React JS. However, they serve different purposes. State is used to manage and store data within a component, while props are used to pass data from a parent component to a child component.

5. What are the lifecycle methods of a React component?

React components have several lifecycle methods that are called at different points in a component’s lifecycle. These methods include componentDidMount, componentDidUpdate, and componentWillUnmount, among others. Understanding the lifecycle methods of a React component is crucial for creating well-structured and efficient components.

These are just a few of the many interview questions that you might encounter when interviewing for a React JS position. It’s important to be well-prepared and have a good understanding of React JS concepts and best practices. By familiarizing yourself with these commonly asked questions, you can increase your chances of acing your React JS interview.