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
231. In Node.js, what is the primary purpose of the "package.json" file?
A. To store application data
B. To define the project's dependencies, scripts, and metadata
C. To manage server configurations
D. To execute JavaScript code
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Answer: To define the project's dependencies, scripts, and metadata
232. Which npm command is used to install project dependencies listed in the "package.json" file?
A. npm start
B. npm install
C. npm create
D. npm run
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Answer: npm install
233. What is the purpose of the "node_modules" directory in a Node.js project?
A. To store backup copies of the application code
B. To contain built-in Node.js modules
C. To store third-party packages and libraries installed via npm
D. To host the application's database
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Answer: To store third-party packages and libraries installed via npm
234. Which npm command is used to uninstall a package from a Node.js project?
A. npm remove
B. npm uninstall
C. npm delete
D. npm discard
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Answer: npm uninstall
235. What is "Yarn" in the context of Node.js development?
A. A tool for executing JavaScript code
B. A web framework for Node.js
C. A package manager for managing dependencies
D. A testing framework for Node.js
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Answer: A package manager for managing dependencies
236. Yarn was developed by which technology companies in collaboration with the open-source community?
A. Facebook, Google, and Microsoft
B. Apple, Amazon, and IBM
C. Netflix, Twitter, and LinkedIn
D. Mozilla, Oracle, and Adobe
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Answer: Facebook, Google, and Microsoft
237. In Yarn, what is the purpose of the "yarn.lock" file?
A. To store application data
B. To define project metadata and scripts
C. To manage server configurations
D. To lock down the specific versions of dependencies to ensure consistency
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Answer: To lock down the specific versions of dependencies to ensure consistency
238. Which Yarn command is used to install project dependencies based on the information in the "yarn.lock" file?
A. yarn build
B. yarn install
C. yarn create
D. yarn add
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Answer: yarn install
239. What is an advantage of using Yarn over npm for package management in Node.js projects?
A. Yarn provides a more extensive set of built-in modules.
B. Yarn offers faster and more reliable dependency resolution and installation.
C. Yarn is the official package manager for Node.js.
D. Yarn has better support for browser-based applications.
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Answer: Yarn offers faster and more reliable dependency resolution and installation.
240. What is the primary purpose of a CLI tool developed using Node.js?
A. To create complex web applications
B. To interact with and control software or perform tasks through a text-based interface
C. To run JavaScript code in a web browser
D. To optimize database queries
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Answer: To interact with and control software or perform tasks through a text-based interface
