You are tasked with refactoring a large codebase to make it more modular. What considerations should you have regarding the import and export of modules to ensure smooth transition and maintainability?
- Use default exports for all modules.
- Avoid circular dependencies between modules.
- Use global variables for module access.
- Mix HTML and JavaScript in modules for simplicity.
When refactoring a codebase to make it more modular, you should avoid circular dependencies between modules (Option b). Circular dependencies can lead to maintenance challenges and make the codebase harder to understand. Using default exports for all modules (Option a) is not a best practice as it can limit the flexibility of importing modules. Using global variables (Option c) and mixing HTML and JavaScript (Option d) go against the principles of modularity and should be avoided.
What is the primary benefit of implementing a Write-Through caching strategy?
- Improved cache hit rates
- Reduced latency for write operations
- Reduced storage space requirements
- Simplified cache management
The primary benefit of a Write-Through caching strategy is reduced latency for write operations. Data is written to both the cache and the underlying data store simultaneously, ensuring that the cache and data store are always in sync.
How do database management systems typically handle indexing of JSON and XML data types?
- They don't support indexing for JSON and XML data types.
- They create traditional B-tree indexes for JSON and XML data.
- They use specialized indexing techniques like GIN (Generalized Inverted Index) and GIST (Generalized Search Tree) for JSON and XML data.
- They rely on external search engines for indexing JSON and XML data.
Database management systems typically use specialized indexing techniques like GIN (Generalized Inverted Index) and GIST (Generalized Search Tree) for JSON and XML data types. These indexes are designed to efficiently handle the hierarchical and semi-structured nature of JSON and XML data.
To handle HTTPS requests using the http module, the ______ module should also be used in conjunction.
- net
- tls
- crypto
- url
To handle HTTPS requests using the http module, the tls (Transport Layer Security) module should also be used in conjunction. TLS provides encryption and security for HTTPS connections. The net module is used for basic networking, crypto for cryptographic operations, and url for parsing URL strings, but tls is specifically used for securing HTTP with HTTPS.
What is the primary function of the Event Loop in Node.js?
- Handling HTTP Requests
- Executing Asynchronous Code
- Database Operations
- Managing File I/O
The primary function of the Event Loop in Node.js is to execute asynchronous code efficiently. It ensures that non-blocking operations are processed without blocking the main thread, enabling Node.js to handle many simultaneous connections and I/O operations. The other options describe tasks that Node.js can perform but are not the primary purpose of the Event Loop.
Which of the following is a commonly used caching mechanism in web development?
- Memcached
- Postgres
- SMTP
- HTTP
Memcached is a commonly used caching mechanism in web development. It is an in-memory key-value store that helps improve the speed and performance of web applications by caching frequently accessed data. The other options (Postgres, SMTP, and HTTP) are not caching mechanisms.
The Buffer class in Node.js is a global class and can be accessed in an application without importing the ______ module.
- fs
- net
- buffer
- http
The Buffer class in Node.js is available globally, so it can be accessed without importing any specific module. This is one of the unique features of the Buffer class in Node.js.
What command will uninstall a Node.js package?
- npm remove
- npm delete
- npm uninstall
- npm purge
To uninstall a Node.js package, you should use the npm uninstall command. This command removes the package from the current project. The other options are either incorrect or not the standard way to uninstall a package.
When defining dynamic routes in Express.js, using :param* will match ______ in the route path.
- param
- :param
- *param
- :param*
In Express.js, when defining dynamic routes, using :param* will match any characters after param in the route path and store them as a parameter in the request object. The other options do not represent the correct syntax for defining dynamic routes in Express.js.
You are building a chat application in Node.js and need to handle different types of messages like text, images, and files. How would you structure the event emitters and listeners to handle different message types efficiently?
- Create separate events for each message type: event.emit('textMessage', message)
- Use a single event and send message type as a parameter: event.emit('message', messageType, message)
- Create a listener for each message type: event.on('textMessage', textMessageCallback)
- Create a single listener and use conditional checks to handle message types: event.on('message', messageCallback)
To efficiently handle different message types in a chat application, it's best to create separate events for each message type (e.g., 'textMessage', 'imageMessage', 'fileMessage'). This approach keeps the code organized and allows specific handlers for each message type. The other options may lead to less structured and harder-to-maintain code.