What will be the default encoding when converting a buffer to a string in Node.js?
- utf-8
- binary
- ascii
- base64
When converting a buffer to a string in Node.js, the default encoding is utf-8. It's important to specify the encoding when performing this conversion, as using the wrong encoding can lead to incorrect results or data corruption.
The process of rewriting a SQL query to improve its efficiency without changing its behavior is known as ________.
- Query Tuning
- Query Optimization
- Query Refactoring
- Query Modification
The process of rewriting a SQL query to improve its efficiency without changing its behavior is known as "Query Optimization." This involves making changes to the query or its execution plan to make it faster while still returning the same results.
When using semantic versioning, what is the recommended way to handle deprecations?
- Deprecations should be documented in the code comments only.
- Deprecations should be ignored as they don't fit into semantic versioning.
- Deprecations should be marked as 'deprecated' in code comments and, if necessary, in the README or documentation.
- Deprecations should be removed from the codebase without any notice.
In semantic versioning, it's recommended to mark deprecations as 'deprecated' in code comments and, when applicable, in the README or documentation. This helps users of the library or package understand what's changing and how it might impact their code.
The process object in Node.js emits a ______ event when the Node.js process is about to exit.
- beforeExit
- exit
- shutdown
The process object in Node.js emits the beforeExit event just before the Node.js process is about to exit. This event allows you to perform cleanup tasks before the process terminates.
During the development of a Node.js application, you realize that multiple packages are not compatible with each other due to different required versions. How would you resolve the incompatibility between these packages?
- Delete one of the incompatible packages
- Use a tool like npm-shrinkwrap to lock package versions
- Update all packages to their latest versions
- Modify your code to work with the conflicting versions
To resolve package version incompatibility, you can use a tool like npm-shrinkwrap to lock package versions, ensuring that all team members use the same versions. Deleting packages or updating them indiscriminately can introduce issues.
A ______ request is sent by the browser before the actual request to check the server’s CORS policy.
- preflight
- probe
- inspection
- initiation
A "preflight" request is sent by the browser before the actual cross-origin request to check the server's CORS policy. It helps the browser determine whether the actual request is safe to send and whether the server will allow it.
How does the 'events' module in Node.js help in managing asynchronous operations?
- It provides a way to pause and resume asynchronous tasks.
- It allows you to execute asynchronous tasks in parallel.
- It provides an event-driven architecture for handling asynchronous operations.
- It enables synchronous execution of asynchronous tasks.
The 'events' module in Node.js is designed to facilitate event-driven programming, allowing you to handle asynchronous operations by defining event listeners and emitters. It does not provide mechanisms for pausing, resuming, or executing tasks synchronously.
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.
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.
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.
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 importance of the order of middleware in the Express app's middleware stack?
- The order doesn't matter; middleware execution is random
- It determines the execution sequence of middleware functions
- It impacts the Express app's performance but not its functionality
- Middleware order only matters in development, not in production
The order of middleware in the Express app's middleware stack is crucial as it determines the execution sequence of middleware functions. Middleware functions can modify requests and responses, and the order affects how these modifications cascade through the stack, potentially impacting the app's behavior.