NestJS Introduction 2

Question 1

Which TypeScript decorator marks a class as a NestJS module?

Accepted Answer

@Module()

Answer

@Module() decorator tells NestJS that the class is a module and provides metadata to organize the application structure.

Question 2

What is the purpose of the 'providers' array inside a @Module() decorator?

Accepted Answer

Declare injectable services available via dependency injection

Answer

The 'providers' array registers services and other injectables that the NestJS DI system will instantiate and manage.

Question 3

Which command creates a new NestJS project using the Nest CLI?

Accepted Answer

nest new myapp

Answer

'nest new myapp' scaffolds a new NestJS project with default configuration, package.json, and boilerplate files.

Question 4

What does the 'imports' array in @Module() accomplish?

Accepted Answer

Makes exported providers of other modules available

Answer

The 'imports' array allows a module to use providers that are exported by other imported modules.

Question 5

NestJS uses which design pattern for its dependency injection system?

Accepted Answer

Inversion of Control (IoC) container

Answer

NestJS implements an IoC container where dependencies are declared and resolved automatically rather than being manually instantiated.

NestJS Practice Test