5 Important React Interview Questions
If you’re preparing for a React interview, it’s important to be familiar with some of the most commonly asked questions. Here are five important React interview questions that you should know:
- What is React?
- What are the key features of React?
- What is the difference between components and elements in React?
- What is state in React?
- What are the key differences between class components and functional components?
React is a popular JavaScript library used for building user interfaces. It allows developers to create reusable UI components and efficiently update the UI when the data changes. It is maintained by Facebook and a community of individual developers and companies.
Some of the key features of React include virtual DOM for optimal performance, component-based architecture for reusability, and JSX for writing HTML within JavaScript for easier development and maintenance.
Components are reusable and independent pieces of the user interface, while elements are instances of components that are rendered to the DOM. Components can contain elements, other components, or both.
State is a built-in feature in React that allows components to create and manage their own data. It is used to store data that may change over time and trigger UI updates when it does. State is typically initialized in the constructor and updated using the setState method.
Class components are ES6 classes that extend React.Component and have access to state and lifecycle methods. Functional components are simpler and more lightweight, using functional syntax and hooks for managing state and side effects.
These are just a few examples of the types of questions you may encounter in a React interview. It’s important to familiarize yourself with these concepts and be prepared to demonstrate your understanding of React’s fundamental principles and best practices.
Good luck with your interview preparation!
