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.
Which command is used to install Angular Universal in an existing Angular project?
- ng add @angular/universal
- ng add @nguniversal/express-engine
- ng add universal
- ng install angular-universal
To install Angular Universal in an existing Angular project, you use the command ng add @nguniversal/express-engine.
How can you test an Angular component that depends on a service with asynchronous methods?
- Manually delay the test execution with setTimeout
- Use Jasmine's done function
- Use the fakeAsync and tick functions
- Utilize the async and await keywords
In Angular testing, you can test a component with asynchronous service dependencies by using the **fakeAsync** and **tick** utilities. These allow you to handle asynchronous operations in a controlled manner during testing. The done function, async/await, and setTimeout are less suitable for this purpose.
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.
In a reactive form, which method is used to access a form control's value?
- access() method
- getValue() method
- retrieve() method
- value() method
In a reactive form, you can access a form control's value using the value() method provided by the FormControl class. This method returns the current value of the form control.
What could be a potential issue if two services have a circular dependency on each other in Angular?
- Compilation error
- No issue, Angular handles it automatically
- Reduced performance
- Stack overflow error
If two services have a circular dependency on each other in Angular, it can lead to a stack overflow error as they keep calling each other recursively.
When using Angular Elements, the _____ function is used to convert an Angular component into a custom element.
- createCustom()
- createCustomElement()
- createModule()
- ngModule()
When using Angular Elements, the createCustomElement() function is used to convert an Angular component into a custom element.
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.