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
211. What is the purpose of a build tool like Webpack or Parcel in React application deployment?
A. To run the application locally
B. To optimize and bundle the code
C. To create a new React component
D. To manage state in Redux
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Answer: To optimize and bundle the code
212. Which of the following is not a commonly used hosting service for deploying React applications?
A. GitHub Pages
B. Netlify
C. Heroku
D. ReactHub
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Answer: ReactHub
213. What is the role of Continuous Integration/Continuous Deployment (CI/CD) tools in React application deployment?
A. To build, test, and deploy code automatically
B. To write React code
C. To optimize CSS styles
D. To manage database connections
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Answer: To build, test, and deploy code automatically
214. Which command is commonly used to create a production build of a React application?
A. npm create-react-app
B. npm start
C. npm run build
D. npm deploy
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Answer: npm run build
215. What is the purpose of setting environment variables in a React application before deployment?
A. To hide sensitive data
B. To increase the application's speed
C. To improve SEO
D. To add new features
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Answer: To hide sensitive data
216. In React, what does "pre-rendering" refer to in the context of server-side rendering (SSR)?
A. Rendering components before user interactions
B. Rendering components after user interactions
C. Rendering components only on the server
D. Rendering components on the client side
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Answer: Rendering components only on the server
217. What is the primary advantage of deploying a React application using a Content Delivery Network (CDN)?
A. Faster loading times
B. Enhanced security
C. Access to server logs
D. Better error handling
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Answer: Faster loading times
218. What is a common method for optimizing images in a React application before deployment?
A. Using a version control system
B. Compressing and resizing images
C. Minifying JavaScript code
D. Installing more RAM
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Answer: Compressing and resizing images
219. What is "code splitting" in the context of React application deployment?
A. Dividing the code into small, manageable parts
B. Running automated tests
C. Storing code in multiple repositories
D. Optimizing SQL queries
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Answer: Dividing the code into small, manageable parts
220. What is the purpose of a "deployment pipeline" in React application deployment?
A. To automate the deployment process
B. To design the user interface
C. To manage database connections
D. To improve code quality
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Answer: To automate the deployment process
