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.
You have a logging service that logs errors to the console in the development environment and sends them to the server in the production environment. How can you switch between different implementations of the logging service depending on the environment?
- Using 'app.module.ts' file
- Using 'config.json' file
- Using 'environment.ts' configuration
- Using a separate service for each environment
To switch between different implementations of the logging service based on the environment, you can use the 'environment.ts' configuration, which allows you to specify different configurations for each environment.
What is the purpose of using AbstractControl in reactive forms?
- Handle HTTP requests
- Handle routing in Angular
- Manage form validation and user input state
- Render component views
AbstractControl is used to manage form validation and user input state in reactive forms. It represents a form control, such as an input field, and provides validation and interaction capabilities.
The _____ function is used to compose multiple validators into a single function that combines their effects.
- asyncValidator
- combineLatest
- composeValidators
- validateControl
In Angular, the composeValidators function is used to compose multiple validators into a single function that combines their effects.
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 primary use of custom validators in Angular forms?
- Applying CSS styles
- Controlling routing and navigation
- Enhancing user interface
- Performing data validation
The primary use of custom validators in Angular forms is for performing data validation. Custom validators are used to check and ensure the validity of user input.
For a form control, setting the _____ property ensures that the validation status is updated only when the control loses focus.
- markAsTouched
- updateOn
- updateValueAndValidity
- validator
In Angular, setting the updateOn property for a form control ensures that the validation status is updated only when the control loses focus.
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.