The ______ class in the http module is used to parse the incoming request headers and body.
- Request
- IncomingMessage
- HttpRequest
- HttpParser
The IncomingMessage class in the http module is used to parse the incoming request headers and body. It provides methods and properties for accessing request data, including headers, HTTP method, and request body. The other options do not represent the class responsible for parsing incoming request data in the HTTP module.
What is the primary purpose of having dependencies in a Node.js project?
- To enhance the code readability
- To ensure backward compatibility
- To manage external libraries and packages
- To reduce the code size
In a Node.js project, dependencies are primarily used to manage external libraries and packages that your project relies on. They allow you to easily include and use third-party code, making it an essential part of Node.js development.
In Node.js, the process.on('exit', handler) event listener can only perform synchronous operations and cannot perform __________.
- Asynchronous operations
- I/O operations
- Synchronous operations
- Blocking operations
The process.on('exit', handler) event listener in Node.js can only perform synchronous operations because the event is emitted when the Node.js process is about to exit, and it's not suitable for asynchronous or blocking operations.
When implementing a Write-Back caching strategy, what potential issue should be considered?
- Cache pollution
- Cache invalidation
- Write amplification
- Data duplication
When using a Write-Back caching strategy, a potential issue to consider is "write amplification." This occurs when multiple small writes to the cache result in larger writes to the underlying storage, potentially reducing performance gains.
To avoid cross-site scripting (XSS) attacks, EJS escapes any JavaScript code included within the ______ tags by default.
- <%= %>
- {{ }}
- {% %}
- ()()
In EJS, to avoid XSS attacks, JavaScript code is escaped by default when placed within <%= %> tags. This means that any code within these tags will be treated as plain text and not executed. The other options are not used for escaping JavaScript code in EJS.
You are building an API using Express.js, and you want to ensure that the client receives meaningful error messages when something goes wrong. How would you structure your error-handling middleware to achieve this?
- Send status code 200 for all errors
- Use generic error messages for all errors
- Create custom error classes and send detailed error messages
- Log errors to the console only
To ensure that clients receive meaningful error messages, you should structure your error-handling middleware to create custom error classes and send detailed error messages. This allows you to provide specific information about the nature of the error, making it easier for clients to understand and handle errors gracefully. Sending generic error messages or using status code 200 for all errors would not provide meaningful information to clients. Logging errors to the console only is not sufficient for client communication.
To integrate ESLint with your editor, you can use an ESLint ________ for your specific editor.
- Extension
- Plugin
- Configuration
- Package
To integrate ESLint with your code editor, you can use an ESLint extension specifically designed for your editor. These extensions provide a user-friendly interface for running ESLint within your coding environment. While plugins and configurations are related to ESLint setup, they do not directly integrate with the editor. Packages, in this context, are not typically used for integrating ESLint with editors.
In a relational database, the process of organizing data to minimize redundancy is known as ________.
- Normalization
- Denormalization
- Optimization
- Serialization
In a relational database, the process of organizing data to minimize redundancy is known as "Normalization." This technique helps in avoiding data anomalies and maintaining data integrity by breaking down tables into smaller, related tables.
Which of the following is a practical use of closures in JavaScript?
- Implementing asynchronous operations like AJAX requests.
- Creating global variables for sharing data across different scripts.
- Defining functions with no parameters.
- Handling keyboard events in a web page.
Closures are often used in JavaScript to implement asynchronous operations like AJAX requests, where you want to maintain the context and state of the calling function. The other options are not practical use cases for closures.
When creating a buffer in Node.js, if you do not specify an encoding type, the data will be treated as ______.
- binary
- text
- utf-8
- base64
If you don't specify an encoding type when creating a buffer in Node.js, the data will be treated as binary. This means that Node.js will not attempt to interpret the content as characters but will treat it as raw binary data.