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
71. In Node.js, what are streams primarily used for?
A. Playing audio files
B. Handling large amounts of data efficiently, especially for reading or writing data sequentially
C. Creating HTML templates
D. Managing network connections
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Answer: Handling large amounts of data efficiently, especially for reading or writing data sequentially
72. What is a key advantage of using streams in Node.js for I/O operations?
A. Streams are only suitable for handling small amounts of data.
B. Streams automatically handle error handling and data validation.
C. Streams allow data to be processed piece by piece, reducing memory consumption and improving performance.
D. Streams can only be used for reading data, not writing data.
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Answer: Streams allow data to be processed piece by piece, reducing memory consumption and improving performance.
73. In Node.js, which core module provides the foundation for working with streams?
A. http
B. fs
C. stream
D. net
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Answer: stream
74. What is a readable stream in Node.js?
A. A stream that can only be written to
B. A stream that can only be read from
C. A stream that can be both read from and written to
D. A stream that is never used for I/O operations
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Answer: A stream that can only be read from
75. What is a writable stream in Node.js?
A. A stream that can only be read from
B. A stream that can only be written to
C. A stream that can be both read from and written to
D. A stream that is never used for I/O operations
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Answer: A stream that can only be written to
76. In Node.js, which method is commonly used to pipe data from a readable stream to a writable stream?
A. stream.pipeTo()
B. stream.connect()
C. stream.link()
D. stream.pipe()
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Answer: stream.pipe()
77. What is the purpose of the fs.createReadStream method in Node.js?
A. To read the contents of a file synchronously
B. To create a writable stream
C. To create a readable stream for reading data from a file
D. To create a network socket
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Answer: To create a readable stream for reading data from a file
78. What is the purpose of the fs.createWriteStream method in Node.js?
A. To read the contents of a file synchronously
B. To create a writable stream for writing data to a file
C. To create a readable stream
D. To create a network socket
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Answer: To create a writable stream for writing data to a file
79. What is a duplex stream in Node.js?
A. A stream that can only be read from
B. A stream that can only be written to
C. A stream that can be both read from and written to
D. A stream that is used for network communication
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Answer: A stream that can be both read from and written to
80. Which event is emitted by a readable stream when it reaches the end of the data?
A. data
B. end
C. readable
D. finish
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Answer: end
