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
251. Which Node.js tool is commonly used for enforcing and automatically formatting code according to a specific coding style?
A. Node Inspector
B. npm
C. ESLint
D. Nodemon
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Answer: ESLint
252. In Node.js development, what is the recommended naming convention for variables and functions?
A. All lowercase with underscores (e.g., my_variable)
B. CamelCase (e.g., myVariable)
C. All uppercase (e.g., MY_VARIABLE)
D. No specific convention
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Answer: CamelCase (e.g., myVariable)
253. What is the purpose of using comments in Node.js code?
A. To hide code from other developers
B. To provide additional security
C. To explain the code's functionality, logic, and usage
D. To create HTML templates
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Answer: To explain the code's functionality, logic, and usage
254. What is "callback hell" in the context of Node.js development, and how can it be mitigated?
A. A coding style that involves nested callbacks, making the code hard to read and maintain
B. A design pattern for asynchronous code
C. A debugging technique
D. A method for optimizing database queries
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Answer: A coding style that involves nested callbacks, making the code hard to read and maintain
255. Which Node.js module is commonly used for handling asynchronous operations and avoiding callback hell?
A. fs
B. async
C. http
D. cluster
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Answer: async
256. When should error handling be implemented in Node.js code?
A. Error handling is optional and should be skipped for simplicity.
B. Error handling should be implemented only for expected errors.
C. Error handling should be implemented for all possible error scenarios to ensure robustness.
D. Error handling is the responsibility of the operating system, not the developer.
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Answer: Error handling should be implemented for all possible error scenarios to ensure robustness.
257. What is the purpose of "promises" in Node.js development, and how do they differ from callbacks?
A. Promises are used for debugging code, and they are interchangeable with callbacks.
B. Promises are a way to handle asynchronous operations in a more readable and structured manner compared to callbacks.
C. Promises are a type of callback.
D. Promises are used for caching data.
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Answer: Promises are a way to handle asynchronous operations in a more readable and structured manner compared to callbacks.
258. Which HTTP status code should be returned when a requested resource is not found in a Node.js web application?
A. 200 OK
B. 201 Created
C. 404 Not Found
D. 500 Internal Server Error
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Answer: 404 Not Found
259. In Node.js, what is the purpose of the "try...catch" statement in error handling?
A. To execute code repeatedly
B. To handle asynchronous operations
C. To catch and handle exceptions or errors that occur within a block of code
D. To create HTML templates
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Answer: To catch and handle exceptions or errors that occur within a block of code
