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.
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Practice Test
181. What is Server-Side Rendering (SSR) in the context of React.js?
A. Rendering React components on the server
B. Rendering React components on the client
C. Running React applications on a server
D. Serving static HTML pages
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Answer: Rendering React components on the server
182. Which key benefit of SSR can lead to improved SEO for React applications?
A. Faster loading times
B. Improved security
C. Search engines can index content
D. Enhanced animations and transitions
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Answer: Search engines can index content
183. What is the main challenge of Server-Side Rendering (SSR) in React?
A. Limited interactivity on the client side
B. Difficulty in setting up a server
C. Slower initial page load
D. Incompatibility with modern browsers
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Answer: Limited interactivity on the client side
184. Which React library or framework facilitates Server-Side Rendering (SSR) by default?
A. Next.js
B. Redux
C. Axios
D. GraphQL
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Answer: Next.js
185. In SSR, when is the initial rendering of a React component performed?
A. On the server
B. On the client
C. On both the server and client
D. Only in modern browsers
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Answer: On the server
186. What is the purpose of the hydrate() method when using SSR in React?
A. To disable client-side rendering
B. To start the client-side rendering
C. To fetch data from the server
D. To pause rendering on the server
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Answer: To start the client-side rendering
187. Which technique can be used to share data between the server and the client in SSR?
A. Using global variables
B. Storing data in cookies
C. Sending data via HTTP headers
D. Passing data as props in components
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Answer: Sending data via HTTP headers
188. What is a potential drawback of Server-Side Rendering (SSR) in React?
A. Complexity of server setup
B. Inability to use JSX
C. Slower rendering on the server
D. Lack of support for CSS-in-JS libraries
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Answer: Complexity of server setup
189. How can you implement code splitting with Server-Side Rendering (SSR) in React?
A. By using serverless functions
B. By using the import() function
C. By manually splitting code into files
D. By disabling SSR for specific routes
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Answer: By using the import() function
190. What is the key advantage of Server-Side Rendering (SSR) for improving perceived performance?
A. Faster server response times
B. Reduced server load
C. Faster client-side rendering
D. Reduced network latency
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Answer: Faster client-side rendering
