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
51. What is React Router used for in a React application?
A. State management
B. Handling API requests
C. Managing client-side routing
D. Server-side rendering
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Answer: Managing client-side routing
52. Which React Router component is used to define the routes in a React application?
A. <Route>
B. <Router>
C. <Link>
D. <App>
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Answer: <Route>
53. How do you render different components based on the URL in React Router?
A. Using the <Link> component
B. Using the <App> component
C. Using the <Route> component
D. Using the <Switch> component
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Answer: Using the <Route> component
54. Which of the following is NOT a valid Route component prop in React Router?
A. path
B. component
C. render
D. click
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Answer: click
55. In React Router, what does the exact prop do when used with a <Route> component?
A. It matches the URL path exactly
B. It renders the component conditionally
C. It sets the URL path to "exact"
D. It adds an extra URL parameter
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Answer: It matches the URL path exactly
56. What is the purpose of the <Link> component in React Router?
A. To create a hyperlink
B. To define a new route
C. To render a component
D. To manage state in a route
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Answer: To create a hyperlink
57. In React Router, how do you access URL parameters from within a component?
A. Using the props.params object
B. Using the props.match.params object
C. Using the props.route object
D. Using the props.location object
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Answer: Using the props.match.params object
58. Which React Router component is used to handle 404 (Not Found) routes?
A. <Route>
B. <NotFound>
C. <Switch>
D. <Error>
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Answer: <Switch>
59. What is the purpose of the <Redirect> component in React Router?
A. To redirect to a different URL
B. To define a new route
C. To render a component conditionally
D. To create a hyperlink
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Answer: To redirect to a different URL
60. Which of the following is a popular third-party library for handling nested routes in React Router?
A. react-routing
B. react-navigation
C. react-nested-routes
D. react-router-dom
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Answer: react-router-dom
