Which of the following is true about the global object in a Node.js module?
- It is available only within the module where it is declared.
- It is a shared object across all modules in a Node.js application.
- It contains all the global variables of the Node.js runtime.
- It can be modified by any module in the application.
The global object in a Node.js module is available only within the module where it is declared. It is not shared across all modules, and each module has its own isolated scope. The other options do not accurately describe the behavior of the Node.js global object.
What is the difference between a static import and a dynamic import in JavaScript?
- Static import is used to load modules at compile time, and it's part of the ES6 module system.
- Dynamic import is used to load modules at runtime, and it returns a promise that resolves to the module.
- Static import is used for loading ES6 modules, while dynamic import is used for CommonJS modules.
- There is no difference between static and dynamic imports in JavaScript.
Static imports are used at compile time and load modules synchronously, while dynamic imports are used at runtime and load modules asynchronously. Dynamic imports return a promise that resolves to the module.
For optimizing complex queries involving multiple JOIN operations, one can use ________ to break them into simpler ones.
- Subqueries
- Indexes
- Caching
- Temporary Tables
For optimizing complex queries involving multiple JOIN operations, one can use "Subqueries" to break them into simpler, more manageable queries. Subqueries allow you to retrieve intermediate results that can be used in the main query.
What is the significance of the order in which middlewares are defined in Express.js?
- The order of middleware does not matter; Express.js automatically arranges them.
- Middlewares are executed in the reverse order of definition.
- Middlewares are executed in the order of definition.
- Middleware order depends on the priority given when defining routes.
In Express.js, middlewares are executed in the order they are defined. The order matters because each middleware can modify the request or response objects and pass them on to the next middleware.
In Express.js, to limit the middleware execution to a particular HTTP method, you should use the ______ method.
- app.use()
- router.use()
- app.method()
- router.method()
To limit the execution of middleware to a specific HTTP method in Express.js, you should use the router.use() method and specify the HTTP method as an argument, such as router.use('GET', middlewareFunction). This ensures that the middleware is only executed for requests with the specified method.
You are tasked with ensuring that a web application works seamlessly and that all components interact as expected. Which testing approach would be most suitable to verify the interactions between different components and services?
- Unit Testing
- Integration Testing
- Functional Testing
- Usability Testing
To verify interactions between different components and services in a web application, Integration Testing is the most suitable approach. Unit Testing focuses on individual units of code, Functional Testing checks if the application meets its specifications, and Usability Testing focuses on user experience. Integration Testing is specifically designed to test the interactions between components.
For processing HTTP requests, Express.js allows defining middleware functions at the application level and ______ level.
- route
- request
- response
- router
In Express.js, you can define middleware functions at both the application level and router level. These middleware functions can be used to handle different parts of the request-processing pipeline.
In Express, ______ is used to match any route that has not been matched by earlier routes.
- default
- fallback
- wildcard
- catch-all
In Express.js, a catch-all or wildcard route is used to match any route that has not been matched by earlier routes. This is often used for creating custom error handlers or handling undefined routes.
How can you pass data from your Express route handler to your EJS view?
- res.render('view', dataObject);
- req.send('view', dataObject);
- res.render('view', dataObject);
- res.send('view', dataObject);
You can pass data from your Express route handler to your EJS view using the res.render('view', dataObject); method. This method renders the EJS view and includes the data in the view template, making it accessible for rendering dynamic content. The other options are not valid ways to pass data to EJS views.
Which property in the package.json file is used to define scripts that can be run with npm?
- scripts
- commands
- npm-scripts
- tasks
In the package.json file, the scripts property is used to define custom scripts that can be run using npm commands. This property allows you to define various scripts such as "start," "test," or custom scripts for tasks like building, linting, or deploying your application.