What is the primary advantage of using the async pipe in Angular templates?

  • Automatically unsubscribes
  • Efficiently manage memory resources
  • Enables two-way data binding
  • Simplifies handling HTTP requests
The primary advantage of using the async pipe is that it automatically unsubscribes from the Observable when the component is destroyed, preventing memory leaks.

In what scenario would you use the ResolveEnd Router Event?

  • For capturing the start of navigation
  • For handling navigation errors
  • For intercepting route changes
  • For triggering preloading strategies
The ResolveEnd Router Event is used for intercepting route changes and executing code when a route is resolved.

What is the main purpose of Angular's change detection mechanism?

  • Detecting runtime errors
  • Keeping the view in sync
  • Managing server requests
  • Monitoring file changes
The main purpose of Angular's change detection mechanism is to keep the view in sync with the application's data, ensuring that updates are reflected in the user interface.

What is the purpose of the finalize operator in an Observable sequence?

  • Combine multiple Observables
  • Complete the Observable
  • Execute code after completion
  • Handle errors in the stream
The purpose of the finalize operator in an Observable sequence is to execute specific code after the Observable has completed, whether successfully or with an error.

To manually check a component and its children, you can inject the _____ service and call its detectChanges() method.

  • ChangeDetectorRef
  • ComponentCheckService
  • ManualDetectionService
  • OnCheckService
To manually check a component and its children in Angular, you can inject the ChangeDetectorRef service and call its detectChanges() method. This allows you to trigger change detection explicitly, which can be useful in specific scenarios where automatic change detection is not sufficient.

The _____ strategy in Angular's change detection checks the component and its children only when an event is fired.

  • Always
  • CheckOnce
  • Default
  • OnPush
The OnPush strategy in Angular's change detection checks the component and its children only when an event is fired, optimizing performance.

The RxJS operator _____ is used to delay the emissions from an Observable.

  • debounceTime
  • filter
  • mergeMap
  • skip
The RxJS operator debounceTime is used to delay the emissions from an Observable. It's often used for scenarios like handling user input and performing searches with a delay.

In Angular testing, the _____ function is used to simulate user interactions on elements.

  • expect
  • mock
  • query
  • trigger
In Angular testing, the trigger function is used to simulate user interactions on elements, such as clicks, inputs, and other events.

You're developing an e-commerce application and want to create a shopping cart service that maintains the state of the cart across different components. What would be the best approach to ensure that all components refer to the same instance of the service?

  • Using 'ngIf' directive
  • Using separate instances for each component
  • Using the 'providedIn' property
  • Using the 'singleton' pattern
The best approach to ensure that all components refer to the same instance of a service is to use the 'singleton' pattern, which allows a single instance of the service to be shared among multiple components.

What is the primary purpose of using a Route Resolver in Angular?

  • Display a loading spinner
  • Execute route guards
  • Fetch route parameters and data
  • Terminate the navigation immediately
The primary purpose of a Route Resolver in Angular is to fetch route parameters and data before navigating to a route.

What is the purpose of the onPrepare function in a Protractor configuration file?

  • Define Protractor plugins
  • Define Protractor's test reporter
  • Initialize the browser
  • Set the test suite to run
In Protractor, the onPrepare function is used to initialize the browser before tests run, making it suitable for setting up the environment.

For debugging and profiling Angular applications, developers can use the _____ browser extension.

  • AngularDebugger
  • AngularDevTools
  • Augury
  • Redux DevTools
For debugging and profiling Angular applications, developers can use the Augury browser extension. It provides insights into an Angular app's structure and behavior.