You've been given a task to add PWA (Progressive Web App) capabilities to your existing Angular application. Which Angular CLI command would you use to achieve this?
- ng add @angular/pwa
- ng pwa --enable
- ng create pwa
- ng generate service-worker
To add PWA capabilities to an existing Angular application, you would use the "ng add @angular/pwa" command (option a). This command sets up the necessary service workers and configuration for a Progressive Web App.
In a scenario where you need to combine responses from multiple API calls but only want to proceed when all calls have completed successfully, which RxJS operator would be most suitable?
- concatMap
- forkJoin
- mergeAll
- switchMap
In a scenario where you need to combine responses from multiple API calls and proceed only when all calls have completed successfully, the most suitable RxJS operator is forkJoin.
What is the purpose of a Route Guard in Angular?
- Controlling access to routes
- Defining route configuration
- Handling route parameters
- Rendering component views
The purpose of a Route Guard in Angular is to control access to routes, allowing you to restrict or permit navigation based on specific conditions.
What is the purpose of the --prod flag when building an Angular application using the Angular CLI?
- Create a new production app
- Enable Angular Pro mode
- Generate production code
- Optimize for production
The --prod flag in the Angular CLI build command is used to optimize the application for production, resulting in smaller and faster code.
When handling errors in an Observable stream, which operator allows you to provide a fallback Observable?
- catchError
- concatMap
- mergeMap
- switchMap
The catchError operator allows you to handle errors in an Observable stream and provide a fallback Observable.
How can you retrieve query parameters and fragments in addition to route parameters using Angular's router?
- ActivatedRoute
- Route guards
- Router events
- Snapshot routing
To retrieve query parameters and fragments in addition to route parameters, you can use ActivatedRoute. ActivatedRoute provides access to route parameters, query parameters, and fragments.
Which decorator is used to define a custom directive in Angular?
- @Component
- @Directive
- @Injectable
- @NgModule
To define a custom directive in Angular, you use the @Directive decorator.
In Angular, what is the purpose of using animations?
- Better security
- Enhanced code readability
- Improved user experience
- Simplified routing
The purpose of using animations in Angular is to provide an improved user experience by adding visual effects and transitions to the application, making it more engaging and user-friendly.
When creating dynamic forms, you can bind form controls to data using the _____ property.
- FormArray
- FormControlArray
- FormGroup
- FormModel
When creating dynamic forms in Angular, you can bind form controls to data using the FormGroup property.
You are writing a test for a component that has a dependency on a service. The service has a method that returns an observable. You want to test how the component behaves when the observable emits a value. What would be the best approach to take?
- Manually Creating Observables and Subscribing to them
- Replacing Observables with Promises in the component
- Testing the component without involving the service
- Using RxJS Marble Diagrams to control observable emissions
The best approach for testing how a component behaves when an observable emits values is to use RxJS Marble Diagrams. They allow you to control and simulate the observable emissions in a predictable way.