Hierarchical Dependency Injection in Angular means that if you request a service from an injector, it will retrieve it from the current injector or from any of its _____ injectors.
- Child
- Parent
- Root
- Sibling
In Angular, Hierarchical Dependency Injection means that if you request a service from an injector, it will retrieve it from the current injector or from any of its Parent injectors.
You are developing an admin panel with multiple sections (e.g., Users, Products, Orders) and want to ensure that only authenticated administrators can access these sections. How would you use Route Guards to protect these sections?
- Apply CanLoad Route Guards to sections
- Create a single global Route Guard for admin access
- Implement a shared authentication service
- Use CanActivate Route Guards for each section
To protect admin sections and ensure authentication, you should use CanActivate Route Guards for each section. These guards check if the user is authorized to access each section.
When testing an Angular service, why might you use a spy?
- To create a new instance of the service
- To mock dependencies used by the service
- To secretly record user interactions
- To simulate service method calls
In Angular testing, you use a spy to mock dependencies used by the service being tested, allowing you to control and observe interactions with those dependencies.
In what scenario would you create a custom directive instead of using a component in Angular?
- Handling user input
- Implementing complex logic
- Managing application state
- Reusing UI behavior
You would create a custom directive in Angular when you want to reuse UI behavior across different parts of your application.
To continue processing in an Observable sequence after an error occurs, you can use the _____ operator to replace the error with a new source.
- catchError
- combineLatest
- map
- retry
To continue processing after an error in an Observable, you can use the catchError operator to replace the error with a new source.
When a navigation fails due to an unexpected error, Angular fires the _____ event.
- NavigationCancel
- NavigationEnd
- NavigationError
- NavigationStart
When a navigation fails due to an unexpected error, Angular fires the NavigationError event. This event is triggered when there is an error during navigation.
To set up the testing environment before running any test suite in Protractor, you can utilize the _____ function in the configuration file.
- beforeAll
- browser.driver
- onCleanup
- onPrepare
To set up the testing environment before running any test suite in Protractor, you can use the onPrepare function in the configuration file.
How do you track the validity and state of a form control in a template-driven form?
- Using *ngIf directive
- Using [(ngModel)] directive
- Using [formControl] directive
- Using [formState] directive
To track the validity and state of a form control in a template-driven form, you can use the [formControl] directive, which binds the control's state and validity to the template.
You're working on an application that has several feature modules. To improve the user experience, you decide to preload some modules in the background while the user is interacting with the app. How can you implement this behavior?
- Manually load modules using import() as the user interacts with different parts of the app
- Use localStorage to cache module data and preload them when the app loads
- Use the Angular Router Preloading Strategy to preload specific modules
- Utilize a service worker to cache and preload modules as a background process
To improve the user experience by preloading specific modules in the background as the user interacts with the app, you can use the Angular Router Preloading Strategy. It allows you to preload modules when needed, optimizing the app's performance.
You are building a form where certain fields need to be shown or hidden based on the selection of a dropdown. How can you dynamically add or remove validations on these fields based on their visibility?
- Create separate forms for each combination of visible fields.
- Use ngClass to toggle validations dynamically.
- Use ngSwitch to toggle validations based on the dropdown value.
- Use the ngIf directive to conditionally add or remove validators.
To dynamically add or remove validations on fields based on their visibility in an Angular form, you should use the ngIf directive to conditionally add or remove validators. This approach allows for dynamic validation based on UI interactions.