Angular Quiz

What is the primary purpose of `ngZone` in Angular?

• To manage routing
• To detect changes outside Angular's context
• To handle HTTP requests
• To manage component lifecycle

Which of the following is true about `ChangeDetectionStrategy.OnPush`?

• It checks for changes in all components
• It only checks for changes when an event occurs
• It checks for changes only when input properties change
• It disables change detection

What does the `async` pipe do in Angular templates?

• Converts observables to promises
• Subscribes to an observable and returns the latest value
• Creates a new observable
• Unsubscribes from all observables

What is the purpose of `Injector` in Angular?

• To create new components
• To manage routing
• To resolve dependencies
• To handle HTTP requests

What is the difference between `Subject` and `BehaviorSubject` in RxJS?

• `Subject` stores the last value, `BehaviorSubject` does not
• `BehaviorSubject` requires an initial value and emits the last value to new subscribers
• `Subject` is synchronous, `BehaviorSubject` is asynchronous
• There is no difference

What is the role of `ng-content` in Angular?

• To define a new component
• To project content into a component
• To bind data
• To handle events

Which lifecycle hook is called after the component’s view has been fully initialized?

• `ngOnInit()`
• `ngAfterViewInit()`
• `ngAfterContentInit()`
• `ngDoCheck()`

How can you improve performance in large Angular applications?

• Use `ngIf` instead of `*ngFor`
• Avoid lazy loading
• Use `trackBy` with `*ngFor`
• Use `ChangeDetectionStrategy.Default` everywhere

In Angular, what is the purpose of `APP_INITIALIZER`?

• To bootstrap the root module
• To delay app initialization until a promise is resolved
• To initialize services after the app starts
• To configure routing

What is the main benefit of using `NgRx` in Angular applications?

• Simplifies routing
• Provides two-way data binding
• Manages state in a predictable and scalable way
• Reduces bundle size