What is the primary use of Streams in Node.js?

Managing database connections
Handling HTTP requests and responses
Storing configuration data
Sorting arrays

The primary use of Streams in Node.js is for handling data in a streaming fashion, especially for reading and writing data efficiently. They are commonly used for handling HTTP requests and responses, file I/O, and more, where data can be processed in smaller chunks without loading the entire dataset into memory.

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In Express.js, how can you handle errors occurring in asynchronous code within a route handler?

try-catch
next(error)
return error;
res.error(error)

In Express.js, you can handle errors occurring in asynchronous code within a route handler by calling next(error). This passes the error to the error-handling middleware or the default error handler, allowing you to centralize error handling. Using a try-catch block won't catch asynchronous errors, and the other options are not standard practices for error handling in Express.js.

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Which type of testing focuses on verifying the functionality of individual components in isolation?

Unit Testing
Integration Testing
System Testing
Performance Testing

Unit Testing focuses on verifying the functionality of individual components (or units) in isolation. It helps ensure that each component works correctly on its own.

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Which of the following is the correct syntax for destructuring an array in JavaScript?

let [x, y] = [1, 2];
let {x, y} = [1, 2];
let (x, y) = [1, 2];
let x = [1, 2];

Destructuring an array in JavaScript is done using square brackets []. The correct syntax is let [x, y] = [1, 2];. The other options are either for object destructuring or use incorrect syntax.

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How is the Buffer class in Node.js useful when dealing with binary data?

The Buffer class provides methods to efficiently work with binary data, making it suitable for tasks like reading and writing files, working with network protocols, and handling binary data in memory.
The Buffer class is used for debugging purposes and is not recommended for handling binary data.
The Buffer class is primarily used for string manipulations and should not be used for binary data.
The Buffer class is outdated and has been replaced by Typed Arrays in modern Node.js.

The Buffer class in Node.js is extremely useful when dealing with binary data. It provides methods for efficiently working with raw binary data, making it suitable for tasks such as reading and writing files, working with network protocols, and handling binary data in memory.

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You are tasked with optimizing the build process of a Node.js application. How can the scripts section in the package.json file aid in automating and enhancing the build process?

By adding extensive comments to describe the build steps
By including development dependencies in the scripts section
By defining custom scripts for various build tasks
By removing the scripts section entirely

The scripts section in package.json is used to define custom scripts for various build tasks, test scripts, and more. It aids in automating and enhancing the build process by providing a central place to manage these tasks. Options 1 and 2 are not related to the scripts section, and option 4 is not a recommended approach.

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The continue statement in a loop is used to skip the rest of the loop's body and continue with the next ________.

iteration
condition
loop
statement

The continue statement in a loop is used to skip the remaining part of the current iteration (loop body) and move on to the next iteration. It helps control the flow of a loop.

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You are designing an authentication system for a new API. The API will be accessed by both web clients and other services. Which authentication strategy would be most suitable to ensure security and scalability?

OAuth 2.0
JWT
Basic Authentication
API Keys

OAuth 2.0 is a widely adopted authentication strategy for securing APIs accessed by various clients. It provides security features such as token-based authentication, authorization, and is suitable for both web clients and services. JWT is a token format and not an authentication strategy on its own. Basic Authentication and API Keys have limitations in terms of security and scalability.

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In Express.js, the all method can be used to handle all HTTP methods, and it is equivalent to the ______ method in terms of functionality.

use()
any()
all()
match()

In Express.js, the all() method is used to handle all HTTP methods (GET, POST, PUT, DELETE, etc.) for a specific route. It is equivalent in functionality to the any() method. The use() and match() methods do not provide the same functionality.

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How does the Event Loop handle asynchronous tasks in Node.js?

By executing them immediately when they are called
By adding them to a queue and executing them in a non-blocking manner
By pausing the main thread until they are complete
By delegating them to a separate Node.js process

The Event Loop in Node.js handles asynchronous tasks by adding them to a queue and executing them in a non-blocking manner. It ensures that asynchronous tasks are processed in the background without pausing the main thread, allowing Node.js to remain responsive. The other options do not accurately describe how asynchronous tasks are handled by the Event Loop.

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