#shorts: React JS Most Asked Interview Question

React JS is a popular front-end library used for building user interfaces. If you’re preparing for a React JS interview, here are some of the most commonly asked questions:

1. What is React JS?

React JS is an open-source JavaScript library used for building user interfaces and single-page applications. It was developed by Facebook and has gained widespread popularity due to its efficiency and flexibility.

2. What are the key features of React JS?

React JS has several key features, including virtual DOM, component-based architecture, JSX syntax, and one-way data binding. These features make it easier to build and maintain complex UIs.

3. What is JSX?

JSX is a syntax extension for JavaScript that allows you to write HTML-like code within your JavaScript files. It makes it easier to write and maintain UI components in React JS.

4. What is the virtual DOM?

The virtual DOM is a lightweight copy of the real DOM that React uses to optimize UI updates. When a user interacts with a React application, the virtual DOM is updated and then compared to the real DOM to efficiently update only the necessary components.

5. What are the component lifecycle methods in React JS?

React components have several lifecycle methods, such as componentDidMount, componentDidUpdate, and componentWillUnmount, which allow you to perform actions at different stages of a component’s lifecycle, such as when it is first mounted or updated.

These are just a few examples of the many questions you may encounter in a React JS interview. By familiarizing yourself with these and other commonly asked questions, you can feel more confident and prepared for your interview.