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
221. What is the primary benefit of organizing a React project into components?
A. Improved code reusability
B. Faster development
C. Smaller bundle size
D. Simplified folder structure
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Answer: Improved code reusability
222. In a typical React project structure, where are global stylesheets often located?
A. Inside the src folder
B. In the root directory
C. In the public folder
D. In the build folder
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Answer: Inside the src folder
223. What is the purpose of the package.json file in a React project?
A. To specify project dependencies
B. To store component code
C. To define global styles
D. To configure Webpack settings
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Answer: To specify project dependencies
224. Which directory is commonly used for storing test files in a React project?
A. tests
B. src
C. public
D. node_modules
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Answer: tests
225. What does the src directory typically contain in a React project?
A. Source code for the application
B. Built and optimized files
C. Test files
D. Documentation
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Answer: Source code for the application
226. In a React project, where is the entry point for the application specified?
A. In the package.json file
B. In the public/index.html file
C. In the src/index.js file
D. In the node_modules folder
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Answer: In the src/index.js file
227. What is the purpose of the public directory in a React project?
A. To store static assets like HTML files
B. To hide sensitive data
C. To define global styles
D. To configure Babel settings
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Answer: To store static assets like HTML files
228. What is the recommended naming convention for React component files?
A. CamelCase
B. kebab-case
C. snake_case
D. PascalCase
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Answer: PascalCase
229. What is the primary function of the node_modules directory in a React project?
A. To store project configuration files
B. To host the application's source code
C. To manage project dependencies
D. To store test files
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Answer: To manage project dependencies
230. What is the purpose of the public directory's index.html file in a React project?
A. To serve as the entry point for the application
B. To define global styles
C. To store application state
D. To configure Webpack settings
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Answer: To serve as the entry point for the application
