You are developing a user management system and need to design routes for CRUD operations. How would you structure the routes to follow RESTful principles in Express.js?
- Use any route structure that suits your needs
- Design routes like /createUser, /getUser, /updateUser, /deleteUser
- Structure routes as /users, using HTTP methods (GET, POST, PUT, DELETE) to indicate CRUD operations
- Create routes like /addUser, /fetchUser, /modifyUser, /removeUser
To follow RESTful principles in Express.js, you should structure routes as a resource, such as /users, and use HTTP methods (GET, POST, PUT, DELETE) to indicate CRUD operations on that resource. This approach aligns with RESTful conventions, making your API more intuitive and standardized. Option 2 doesn't follow RESTful principles, and Options 1 and 4 lack the structured approach recommended for RESTful APIs.
What is the role of the error-handling middleware when dealing with unhandled promise rejections in Express?
- It converts promise rejections into synchronous errors
- It terminates the Node.js process to prevent unhandled rejections
- It logs the unhandled promise rejection and continues execution
- It captures unhandled promise rejections and sends them to the default error handler
The error-handling middleware in Express captures unhandled promise rejections and sends them to the default error handler. This allows you to handle unhandled promise rejections gracefully in your Express application. The other options are not the typical roles of error-handling middleware in this context.
What is the primary purpose of running the npm init command in a Node.js project?
- To install Node.js
- To create a new Node.js project
- To update Node.js packages
- To uninstall Node.js
The primary purpose of running npm init in a Node.js project is to create a new Node.js project. This command initializes a package.json file, which is essential for managing project dependencies and configurations. It does not install or uninstall Node.js itself.
In JavaScript, the import statement cannot be used in ________.
- functions
- classes
- conditionals
- loops
In JavaScript, the import statement cannot be used inside conditionals (e.g., if statements or loops). It must be used at the top level of a module. This is because module imports are processed before the code is executed, and conditionals are not allowed to change the module structure dynamically.
You are tasked with iterating over an array and modifying each element. Which loop structure would be the most suitable, considering the modern ECMAScript standards and why?
- for loop
- while loop
- for...in loop
- for...of loop
In modern ECMAScript standards, the for...of loop is the most suitable for iterating over an array and modifying each element. It provides a cleaner syntax and avoids issues with unexpected behavior that can occur with the for...in loop when working with arrays. The for loop and while loop are also options, but the for...of loop is more concise and specifically designed for array iteration.
How can you match routes with a specific pattern in Express.js?
- app.pattern('/route', callback)
- app.match('/route', callback)
- app.use('/route', callback)
- app.get('/route', callback)
In Express.js, you can use the app.get('/route', callback) method to match routes with a specific pattern. The get method is used to handle HTTP GET requests and is often used to define routes with specific patterns. The other options do not represent the standard way to define route patterns in Express.js.
What is the main difference between SQL and NoSQL databases regarding data structure?
- SQL databases are faster than NoSQL databases.
- SQL databases are faster than NoSQL databases.
- SQL databases are limited to relational data, while NoSQL databases can handle any data type.
- SQL databases are open source, while NoSQL databases are proprietary.
The main difference is that SQL databases use a structured, tabular format for data storage, adhering to a fixed schema, while NoSQL databases use various flexible data models, making them suitable for unstructured or semi-structured data. SQL databases are not inherently faster, and the choice depends on the specific use case.
How do you correctly implement a middleware function in Express.js?
- Define a function with the signature (req, res)
- Use the middleware() keyword before a route definition
- Import the express-middleware module
- Add a next() function to the route handler
To correctly implement a middleware function in Express.js, you define a function with the signature (req, res). This function can also take an optional next parameter if you want to pass control to the next middleware in the stack. The (req, res) signature allows you to access and modify the request and response objects.
Cache ______ is a situation where multiple requests are made to a resource that is expensive to produce, causing a surge in load.
- Throttling
- Bursting
- Collapsing
- Overloading
Cache bursting is a situation where multiple requests are made to a resource that is expensive to produce, causing a surge in load. It typically occurs when cached data expires or when the cache is invalidated.
To run multiple npm scripts sequentially in the specified order, you can use npm run ______.
- series
- sequence
- concat
- parallel
To run multiple npm scripts sequentially, you can use the npm run command followed by the script names separated by space. The scripts will run in the order you specify, one after the other.
The method '______' is used to read data from a readable stream in Node.js.
- readData
- fetch
- read
- getData
In Node.js, the read method is used to read data from a readable stream. It allows you to retrieve data from the stream in chunks. The other options are not the correct methods for reading data from readable streams.
How does the placement of a package in dependencies or devDependencies affect the build process of a project?
- It has no impact on the build process; it's only for organizational purposes.
- Packages in dependencies are bundled together, while devDependencies are loaded asynchronously.
- Dependencies are loaded first and are critical for the build, while devDependencies are optional.
- Packages in devDependencies are included in the production build.
The placement of a package in dependencies or devDependencies affects the build process. Packages in dependencies are critical for the build and are loaded first, while packages in devDependencies are optional and excluded from the production build.