Node.js, often referred to as simply "Node," is a powerful open-source runtime environment that allows developers to execute JavaScript code outside of web browsers. It is designed for building scalable and efficient network applications, particularly on the server side. Node.js leverages a non-blocking, event-driven architecture, making it ideal for handling asynchronous operations and real-time applications. With its vast ecosystem of packages and modules available through npm (Node Package Manager), Node.js has become a popular choice for web development, microservices, APIs, and more, enabling developers to create high-performance applications with ease.
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Practice Test
151. What is the primary purpose of error handling in Node.js applications?
A. To intentionally crash the application
B. To log all errors to a file
C. To gracefully handle unexpected errors and prevent application crashes
D. To ignore errors and continue executing the code
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Answer: To gracefully handle unexpected errors and prevent application crashes
152. In Node.js, how can you catch and handle errors that occur during the execution of synchronous code?
A. By using the try...catch statement
B. By wrapping the code in a setImmediate block
C. By using the throw statement
D. By using the async/await syntax
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Answer: By using the try...catch statement
153. What is the purpose of the Error object in Node.js error handling?
A. To define custom HTTP status codes
B. To represent a caught exception or error, providing information such as the error message and stack trace
C. To terminate the application
D. To create HTML templates
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Answer: To represent a caught exception or error, providing information such as the error message and stack trace
154. In Node.js, what is the role of the process.on('uncaughtException') event handler for error handling?
A. To log all exceptions to a file
B. To handle uncaught exceptions and prevent the application from exiting abruptly
C. To trigger a restart of the application
D. To suppress all uncaught exceptions
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Answer: To handle uncaught exceptions and prevent the application from exiting abruptly
155. Which Node.js module is commonly used for logging and error management in applications?
A. fs
B. http
C. winston
D. url
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Answer: winston
156. What is the primary purpose of testing in Node.js development?
A. To create HTML templates
B. To identify and fix bugs and errors in the application code
C. To handle database migrations
D. To optimize network connections
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Answer: To identify and fix bugs and errors in the application code
157. Which testing framework is commonly used for unit testing in Node.js?
A. Mocha
B. Express
C. Sequelize
D. WebSocket
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Answer: Mocha
158. In Node.js unit testing, what is a test suite?
A. A collection of unrelated test cases
B. A group of related test cases that are executed together
C. A special type of HTTP request
D. A JavaScript module that defines test cases
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Answer: A group of related test cases that are executed together
159. What is the purpose of a test runner in Node.js unit testing?
A. To generate HTML templates for testing
B. To execute test cases and provide the test results
C. To manage database migrations
D. To establish WebSocket connections
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Answer: To execute test cases and provide the test results
160. What does "TDD" stand for in the context of Node.js testing?
A. Test-Driven Development
B. Test Data Design
C. Technical Documentation Development
D. Test Debugging and Deployment
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Answer: Test-Driven Development
