250+ Node Js MCQ With Online Practice Test

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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.

51. What is asynchronous programming in Node.js?

Answer: A programming style that allows non-blocking execution of tasks, often involving callbacks or promises

52. In Node.js, why is asynchronous programming important for handling I/O operations?

Answer: It allows the program to continue executing other tasks while waiting for I/O operations to complete, avoiding blocking.

53. What is a callback function in the context of asynchronous programming in Node.js?

Answer: A function passed as an argument to another function, which is executed later when a specific task is complete

54. What does the "Callback Hell" or "Pyramid of Doom" refer to in Node.js?

Answer: A situation where nested callbacks result in unreadable and hard-to-maintain code

55. What is a Promise in Node.js?

Answer: An object representing a future result of an asynchronous operation, which can be in a resolved or rejected state

56. In a Promise, what does the "resolve" state indicate?

Answer: Successful completion of an asynchronous operation

57. Which JavaScript feature introduced in ES6 (ECMAScript 2015) is commonly used for handling asynchronous code in a more readable and maintainable way in Node.js?

Answer: Promises

58. What is the purpose of the async and await keywords in Node.js?

Answer: To simplify working with Promises and writing asynchronous code in a more linear fashion

59. How does the Node.js Event Loop coordinate asynchronous operations?

Answer: By executing them sequentially, one after the other

60. What is a common use case for asynchronous programming in Node.js?

Answer: Processing large datasets
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