Top React Interview Questions and What React Is All About

In today’s tech-driven world, understanding React has become a crucial asset for developers. If you’re preparing for a job interview or looking to enhance your knowledge, being well-versed in React interview questions can give you a significant edge. This article will dive into what React is, explore its advantages, address common interview questions, compare React with React Native, and guide you through creating components in ReactJS.

What is React?

React is an efficient and flexible open-source JavaScript library created by Jordan Walke, a software engineer at Facebook. It was first used on Facebook's News Feed in 2011 and later on Instagram in 2012.

React is designed to help developers build fast, scalable web applications by using reusable components. It focuses on the view layer of web and mobile apps, making it easy to create dynamic user interfaces.

React uses a virtual DOM to effectively update and render components, resulting in smooth performance. With its component-based structure and easy integration for developers familiar with JavaScript, React has become a popular choice for building single-page applications.

React's versatility extends beyond web applications; it has applications in real-time communication as well. For instance, an RTC Engine like TRTC (Tencent Real-Time Communication) integrate seamlessly with React for building real-time communication features in web and mobile applications.

TRTC provides high-quality real-time audio and video communication capabilities with low latency, making it ideal for live streaming and interactive communication features. These integrations highlight React’s adaptability and its capability to handle complex, interactive features efficiently.

What are the Advantages of Using React?

React provides numerous benefits that have led to its extensive popularity among developers:

Component-Based Architecture

React’s component-based structure allows for modular development. Components are self-contained units that manage their own state and can be reused across the application, making development more efficient and code easier to maintain.

Virtual DOM

React enhances performance through the use of a virtual DOM. Rather than directly altering the real DOM, React initially updates a virtual copy. It then compares this virtual DOM to the real one and applies only the necessary updates in one go. This method reduces the number of expensive DOM operations, leading to better performance.

Declarative Syntax

React employs a declarative syntax to simplify the development of interactive user interfaces. Rather than detailing the process of manipulating the DOM, developers describe how the UI should look based on its current state. React then takes care of rendering and updating the interface automatically, leading to more predictable and dependable code.

Rich Ecosystem and Community Support

React boasts a rich ecosystem of tools, libraries, and extensions. Its large community offers extensive support, tutorials, and resources, making it easier for developers to find solutions and best practices.

JSX

React utilizes JSX (JavaScript XML), a syntax extension that lets developers embed HTML-like structures directly within JavaScript code. This fusion of HTML and JavaScript offers a more straightforward and expressive method for crafting user interface elements and handling their state.

What are The Common React Interview Questions?

Preparing for React JS interview questions can be daunting, but understanding the common queries can make the process easier. Here are some typical React interview questions and their answers: