Dependency Injection & Modules — Chapter Quiz

Question 1

1

Which provider syntax injects a plain object as a value?

AuseClassBuseValueCuseFactoryDuseExisting

useValue registers a precomputed value under the provider token.

Question 2

2

When should you reach for forwardRef?

ATo eagerly load a slow providerBTo break a circular dependency between two providers or modulesCTo resolve an async valueDTo override a class at test time

forwardRef defers resolution so two providers that depend on each other can both be constructed.

Question 3

3

What is the default scope of a Nest provider?

ARequestBTransientCSingleton (Default)DModule

Providers are singletons by default — one instance per application.

Question 4

4

Which provider syntax runs a function to produce the value, and can be async?

AuseValueBuseClassCuseFactoryDuseExisting

useFactory can be async and can depend on other providers via the inject array — perfect for config-driven setup.

Question 5

5

What does @Global() do on a module?

AMakes its providers available everywhere without re-importingBBootstraps the applicationCDisables lazy loadingDMarks it for hot reload

A global module's exported providers are visible to every other module without repeated imports — use sparingly.

Question 6

6

Constructor injection is the recommended way to receive dependencies in Nest.

TTrueFFalse

Constructor injection makes dependencies explicit and easy to mock — the idiomatic Nest pattern.

Question 7

7

A module method named ___ produces a configurable (dynamic) module.

Conventional names are forRoot/forRootAsync for app-wide setup and register/registerAsync for per-feature config.

Question 8

8

Which provider scopes does Nest support?

Select all that apply.

ADEFAULT (singleton)BREQUESTCTRANSIENTDSESSION

The three scopes are DEFAULT, REQUEST, and TRANSIENT. There is no built-in SESSION scope.

Test what you learned.

Dependency Injection — Chapter Quiz