250+ React Js MCQ With Online Practice Test
React.js, often simply called React, is a highly popular JavaScript library for building user interfaces. Developed and maintained by Facebook, React is renowned for its component-based architecture and the ability to efficiently update and render components when data changes. It is a foundational tool for developing modern web and mobile applications, allowing developers to create dynamic and interactive user interfaces with ease. React's vast ecosystem, including tools like React Native for mobile app development, makes it a top choice for frontend development and a key player in the world of web technologies.
201. What is React's primary purpose in web development?
202. Which JavaScript library is often used in conjunction with React for state management?
203. In React, what is JSX short for?
204. Which command is used to create a new React application using Create React App (CRA)?
205. Which component lifecycle method is called just before a component is removed from the DOM?
206. What is the primary function of React Router in a React application?
207. What is the role of Babel in the React ecosystem?
208. Which package manager is commonly used for managing React projects and dependencies?
209. In the context of React, what does "props" stand for?
210. Which of the following is not a valid React component type in the React ecosystem?