How can over-reliance on mocking and stubbing affect the reliability of a test suite?
- It can make tests overly complex
- It can lead to false positives
- It can obscure defects in the code
- It can slow down test execution
Over-reliance on mocking and stubbing can affect the reliability of a test suite by obscuring defects in the code. While mocks and stubs are valuable for isolating code under test, they may not catch integration-level issues. Options 1, 2, and 4 are also potential issues but are not directly related to reliability.
What is the key difference between dependencies and devDependencies in a Node.js project?
- Dependencies are used for production, while devDependencies are used for development only
- Dependencies are for frontend, while devDependencies are for backend
- Dependencies are automatically installed, while devDependencies require manual installation
- There is no difference; the terms are used interchangeably
The key difference is that "dependencies" are used in production, meaning they are essential for the application to run, while "devDependencies" are used only during development, for tasks like testing and building the project. This separation helps reduce the size of production deployments.
You are tasked with building a RESTful API using Express. How would you structure your application to handle different routes and HTTP methods efficiently and maintainably?
- Use Express Router for modular route handling, organize routes by resource, and utilize middleware for common functionality such as authentication and request validation.
- Define all routes in a single large file to simplify maintenance, use conditional statements for routing within the file, and avoid middleware for performance reasons.
- Create separate Express apps for each route, each running on a different port, and use proxy servers to route incoming requests to the appropriate app.
- Use a single route handler function for all routes and differentiate them based on the request method (GET, POST, etc.) within that function.
To build a maintainable and efficient Express application, it's recommended to use Express Router for modular route handling, organize routes logically, and employ middleware for common functionality. Option 2 may lead to code complexity, and options 3 and 4 are not recommended practices for building a RESTful API in Express.
In Express, the ______ method is used to specify a callback function to handle HTTP GET requests to a specified route.
- GET
- POST
- PUT
- callback
In Express.js, the GET method is used to specify a callback function to handle HTTP GET requests to a specified route. The GET method is a standard HTTP method for retrieving data from a server.
What is the significance of the 'newListener' event in the Events module of Node.js?
- It is emitted when a new event listener is added.
- It is emitted when an event listener is removed.
- It is emitted when an error occurs in an event listener.
- It is emitted when an event is triggere
The 'newListener' event is emitted by the 'events' module whenever a new event listener is added to an event emitter. It is useful for tracking the addition of listeners and can be used for various purposes such as logging or monitoring.
How can you implement HTTP/2 using the http module in Node.js?
- HTTP/2 is automatically implemented when you use the http module in Node.js; no special configuration is required.
- You need to enable HTTP/2 by setting the http2 option to true when creating the http server instance.
- HTTP/2 is not supported in the http module of Node.js. You need to use a third-party library for HTTP/2 support.
- HTTP/2 can only be implemented using the https module, not the http module.
To implement HTTP/2 using the http module in Node.js, you need to enable HTTP/2 by setting the http2 option to true when creating the http server instance. This will allow you to take advantage of the features provided by HTTP/2 for improved performance and efficiency.
To allow CORS for all domains, the server should set the Access-Control-Allow-Origin header to ________.
- *
- localhost
- www.example.com
- Same-Origin
To allow CORS for all domains, the server should set the Access-Control-Allow-Origin header to *, which means any domain is allowed to access the resources. This should be done with caution as it can pose security risks if used improperly.
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.