React Coding Interview Questions in 2024

If you are preparing for a React coding interview in 2024, you may want to familiarize yourself with some common interview questions and their answers. React JS is a popular JavaScript library used for building user interfaces, and proficiency in React is often a key requirement for front-end developer roles.

React JS Interview Questions & Answers in 2024

1. What is React and how does it differ from other JavaScript libraries or frameworks?

   React is a JavaScript library for building user interfaces, developed and maintained by Facebook. It differs from other libraries or frameworks in that it focuses solely on the view layer of applications, making it more lightweight and efficient for building UI components.

2. What are the key features of React?

   Some of the key features of React include the virtual DOM for efficient rendering, component-based architecture for reusability, and the use of JSX for writing HTML within JavaScript.

3. What is JSX and how is it used in React?

   JSX is a syntax extension for JavaScript that allows developers to write HTML-like code within their JavaScript files. It is used in React to define the structure of UI components and makes the code more readable and maintainable.

4. What are state and props in React, and how do they differ?

   State and props are both used to pass data into components in React. State is used for managing internal component data that can change over time, while props are used for passing data from parent to child components.

5. What is the difference between controlled and uncontrolled components in React?

   Controlled components are fully controlled by React and their state is managed by React, while uncontrolled components do not have their state managed by React and rely on the DOM to maintain their state.

These are just a few examples of the types of questions you might encounter in a React coding interview in 2024. It is important to have a solid understanding of React fundamentals, as well as hands-on experience with building React applications, in order to succeed in such interviews.