Which built-in validator can be used to ensure a form control's value is required in Angular?
- isRequired
- mandatory
- required
- validateRequired
The **required** validator is used to ensure that a form control's value is required in Angular. It helps validate whether the control has a value.
To detach a component from Angular's change detection system, you would call the _____ method on the component's change detector.
- detach
- ngOnChanges
- ngOnInit
- onDestroy
To detach a component from Angular's change detection system, you would call the detach method on the component's change detector. This can be useful in certain optimization scenarios.
To mock a service's method and provide a custom return value during testing, you can use a Jasmine _____.
- Assertion
- MockService
- SpyOn
- TestBed
You should fill in the blank with SpyOn. Jasmine's SpyOn function allows you to mock methods and functions for testing, including services' methods.
You're developing a form-heavy application and notice that there's a noticeable lag when typing into input fields. Which technique can you use to improve the performance related to data binding?
- One-way data binding
- Two-way data binding
- OnPush change detection strategy
- Component state management
In a form-heavy application, using the OnPush change detection strategy (option c) can significantly improve performance by reducing unnecessary change detection cycles. This strategy ensures that updates are only triggered when input properties change.
Imagine you're building a multi-step form and you want to navigate between steps while preserving the data entered in the form. How would you leverage Navigation Extras to achieve this?
- Pass the form data in URL query parameters using NavigationExtras
- Store form data in a shared service and access it as you navigate between steps
- Use Angular Forms Module to keep track of form data and share it between steps
- Utilize localStorage to store and retrieve form data
To navigate between steps of a multi-step form while preserving the entered data, you can leverage Navigation Extras to pass the form data in URL query parameters using the NavigationExtras provided by Angular.
How can you pass data to a route while navigating to it?
- Using route guards
- Using route parameters
- Using route resolvers
- Using the query string
You can pass data to a route while navigating to it by using route parameters. Route parameters allow you to send data directly in the URL when navigating to a specific route.
To guard a route against unauthorized access, you can implement a custom class that implements the _____ interface.
- AuthenticationGuard
- CanActivate
- CanActivateChild
- RouteGuard
To guard a route against unauthorized access, you can implement a custom class that implements the CanActivate interface.
What does the routerLink directive do in Angular?
- It creates a new Angular project
- It defines a component's class
- It defines a route in the application
- It displays a component in the template
The routerLink directive in Angular is used to define a route in the application. It specifies the route to navigate to when a user interacts with the element containing this directive.
When testing a pipe, you need to check if the ______ is transformed correctly to the desired output.
- Input HTML
- Input data
- Input expression
- Input function
When testing a pipe, you need to check if the input data is transformed correctly to the desired output based on the pipe's logic.
What is the main benefit of using Ivy Renderer in Angular applications?
- Better error handling
- Enhanced routing and navigation
- Faster rendering
- Improved tree-shaking
The main benefit of using the Ivy Renderer in Angular applications is faster rendering, which results in improved application performance.