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.
You are building a real-time chat application and need to ensure that all components displaying chat messages are updated instantly when a new message arrives. Which RxJS entity would be most suitable for this task?
- BehaviorSubject
- Observable
- ReplaySubject
- Subject
In this scenario, Subject is the most suitable choice. Subjects act as both Observers and Observables, making them perfect for handling real-time updates in a chat application, as they can multicast messages to all subscribers.
What is the primary purpose of Angular Elements?
- Create custom modules
- Create reusable web components
- Enable server-side rendering
- Extend Angular applications
The primary purpose of Angular Elements is to create reusable web components that can be used outside Angular applications.
The _____ decorator in a component class binds a property inside the component to a value that is passed from outside the component.
- @Injectable
- @Input
- @Output
- @ViewChild
The @Input decorator in a component class binds a property inside the component to a value passed from outside the component.
In an Angular application, how would you implement a staggered animation with multiple elements?
- Use Angular CLI animations
- Use CSS animations
- Use a third-party animation library
- Use ngFor loop with a timeout
To implement a staggered animation with multiple elements, you can use ngFor loop with a timeout to apply animations to each element with a delay.
To implement lazy loading in Angular, you need to use the loadChildren property in your _______.
- Component
- Module
- Route Configuration
- Service
To implement lazy loading in Angular, you need to use the loadChildren property in your Route Configuration. This property defines which module to load lazily.
What is the advantage of using a Route Resolver over fetching data directly in the component?
- Better caching
- Improved component load time
- Reduced HTTP requests
- Simplicity and ease
The advantage of using a Route Resolver is that it improves component load time by preloading data before the component is displayed.