NestJS and Next.js Knowledge Check

Which design pattern does NestJS primarily follow?

• Singleton design pattern

• Observer design pattern

• Dependency Injection design pattern

• Factory design pattern

What is the purpose of the @Injectable() decorator in NestJS?

• To define a route handler in a controller.

• To create a new module in NestJS.

• To manage application configuration settings.

• To mark a class as a provider for dependency injection.

How do you handle exceptions globally in a NestJS application?

• Use try-catch blocks in every service method.

• Implement error handling in each controller individually.

• Create a custom exception filter and use app.useGlobalFilters() to apply it globally.

• Log errors to the console without any filters.

What is the primary purpose of modules in NestJS?

• To provide a user interface for the application.

• The primary purpose of modules in NestJS is to organize the application into cohesive blocks of functionality.

• To enhance the performance of the application.

• To manage database connections more efficiently.

What is the role of the app.module.ts file in a NestJS application?

• To define the main entry point of the application.

• To configure global middleware for the application.

• To handle error logging and reporting.

• To organize and import all modules, controllers, and providers in the application.

What is the purpose of the useMemo hook in React.js?

• • To memoize a function definition

  
  

• To memoize a value so that it is only recomputed when its dependencies change

• To manage side effects in functional components

• To handle asynchronous operations

React.js allows you to use state in class components without lifecycle methods

• no

• yes

• maybe

What is the difference between controlled and uncontrolled components in React.js

• Controlled components manage their own state, while uncontrolled components rely on React state

• Controlled components are always functional, while uncontrolled components are class-based

• Controlled components use props, while uncontrolled components use refs

• Controlled components rely on React state, while uncontrolled components manage their own state

What's wrong with this React code?

•  It creates an infinite loop

• useState is not imported

• Nothing is wrong

• useEffect needs dependencies

You can create dynamic routes in Next.js using square brackets in file names

• Ayaah

• laaa