React JS Interview Questions

If you’re preparing for a job interview involving React JS, it’s important to be familiar with some common questions that may come up. Whether you’re a seasoned developer or just starting out in the world of React, these questions can help you prepare for a successful interview. Here are some React JS interview questions to consider:

What is React JS?

React JS, often simply referred to as React, is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies, and aims to make the process of building user interfaces more efficient and manageable. React allows developers to create reusable UI components and efficiently update the UI when changes occur.

What are the key features of React JS?

Some key features of React JS include virtual DOM, JSX, component-based architecture, and one-way data binding. Virtual DOM allows React to efficiently update the UI by only re-rendering the components that have changed, JSX is a syntax extension that allows for XML-like code within JavaScript, and the component-based architecture promotes reusability and maintainability in UI development.

What are the differences between class components and functional components in React?

Class components are ES6 classes that extend from React.Component and have the ability to use state and lifecycle methods, while functional components are simply JavaScript functions that take in props and return JSX. With the introduction of hooks in React, functional components can now also manage state and have access to lifecycle methods previously only available to class components.

What are React Hooks?

React Hooks are a feature introduced in React 16.8 that allow functional components to use state and other React features that were previously only available in class components. Hooks provide a more straightforward way to reuse stateful logic between components, and encourage better reusability and composition in React applications.

What is the significance of key prop in React lists?

The key prop is a special attribute that needs to be included when rendering lists in React. It helps React identify which items have changed, are added, or are removed, and is important for optimizing the performance of the application when dealing with dynamic lists.

What are higher-order components in React?

Higher-order components (HOCs) are a design pattern in React that allows for code reuse among components. They are functions that take a component and return a new component with enhanced functionality, and are commonly used for sharing stateful logic between components and adding additional features to existing components.

Conclusion

These are just a few examples of the types of questions that may come up in a React JS interview. It’s important to be prepared to discuss a wide range of topics, including the fundamentals of React, best practices for building user interfaces, and the latest features and updates in the React ecosystem. By familiarizing yourself with these questions and practicing your responses, you can increase your chances of success in your React JS job interview.

Related: React JS Developer Jobs

If you’re looking for a new job opportunity in the field of React JS development, check out our latest job listings for React JS developers. With positions available at top companies and startups, you can find the perfect role to take your React skills to the next level. Browse our listings today and find your next opportunity in React JS development.