Discover the Must-Know React.js Interview Questions You Can’t Miss
React.js has become one of the most popular JavaScript libraries for building user interfaces. As a result, many companies are looking for skilled React.js developers to join their teams. If you’re preparing for a React.js interview, it’s essential to familiarize yourself with some of the most common interview questions that you might be asked. Here are a few must-know React.js interview questions that you can’t miss:
1. What is React.js?
This is a fundamental question that you should be able to answer. React.js is an open-source JavaScript library that is used for building user interfaces, specifically for single-page applications. It was developed by Facebook and is now maintained by a community of developers.
2. What are the key features of React.js?
When answering this question, be sure to mention some of the key features of React.js, such as its virtual DOM, component-based architecture, and the ability to use JSX for templating.
3. What is JSX?
JSX is a syntax extension for JavaScript that allows you to write HTML elements in your JavaScript code. It makes it easier to write and read React components, and it ultimately gets transpiled to standard JavaScript.
4. What are the differences between state and props in React?
Understanding the differences between state and props is crucial for working with React.js. State is used for managing data within a component, and it can be changed by the component itself. Props, on the other hand, are used to pass data from a parent component to a child component.
5. Explain the component lifecycle in React.js
Be prepared to discuss the different phases of a component’s lifecycle, including mounting, updating, and unmounting. You should also be familiar with the methods associated with each phase, such as componentDidMount and componentDidUpdate.
By familiarizing yourself with these must-know React.js interview questions, you can feel more confident and prepared for your next job interview. Good luck!
