What is tree-shaking and how does the Ivy Renderer enhance it in Angular applications?
- A method for optimizing CSS in Angular apps
- A process for generating random tree structures for UI components
- A technique for eliminating unused code
- A way to improve routing in Angular apps
Tree-shaking is a technique for eliminating unused code in your application. The Ivy Renderer enhances tree-shaking in Angular applications by reducing the bundle size through better dead code elimination. This is achieved by creating a more efficient rendering pipeline, which leads to smaller, optimized bundles.
How can you define a child route in an Angular application?
- By creating a module
- By defining it in the parent component
- By specifying loadChildren in the route configuration
- By using the ngFor directive
To define a child route in an Angular application, you specify it in the route configuration of the parent component using the loadChildren property.
In an Angular application, how would you use the async pipe to ensure that a component automatically unsubscribes from an Observable when the component is destroyed?
- Manually unsubscribe in the component
- No need to unsubscribe with async pipe
- Use *ngIf in the template
- Use a try...catch block
When using the async pipe, you don't need to manually unsubscribe; it automatically handles it. There's no need to unsubscribe when using the async pipe.
To display a validation error message only when a form control is touched and invalid, you can use the expressions formControlName._____ and formControlName._____.
- dirty, pristine
- touched, pristine
- valid, dirty
- valid, invalid
To display a validation error message only when a form control is touched and invalid, you can use the expressions formControlName.touched and formControlName.pristine.
When creating a dynamic form, how can you ensure that the form adjusts based on data fetched from an API?
- Use ngFor directive to iterate through form controls
- Use ngIf directive to conditionally render form elements
- Use reactive forms with a fixed structure
- Use static HTML templates
To ensure that a dynamic form adjusts based on data fetched from an API in Angular, you should use the ngFor directive to iterate through form controls. This allows you to generate form elements dynamically based on the API data.
In what scenario would you use the fragment property of the NavigationExtras object?
- For routing configuration
- For smooth scrolling
- To handle query parameters
- To manage lazy loading
The fragment property of the NavigationExtras object is used for smooth scrolling to a specific location on a page after navigation.
How can you access the data resolved by a Route Resolver within a component?
- Using a decorator
- Using a function
- Using a service
- Using an observable
You can access data resolved by a Route Resolver within a component using an observable returned by the ActivatedRoute service.
What is the purpose of a lazy-loaded module in Angular?
- To decrease initial bundle size
- To ensure a module is always loaded
- To improve application performance
- To simplify routing configuration
The purpose of a lazy-loaded module in Angular is to decrease the initial bundle size by loading the module on-demand, typically when a user navigates to a specific route. This helps improve application performance.
You want to implement a feature that prompts the user if they try to navigate away from a form without saving changes. Which Route Guard would you use to achieve this?
- CanActivate Route Guard
- CanDeactivate Route Guard
- CanLoad Route Guard
- Resolve Route Guard
To prompt the user when navigating away from a form, you should use the CanDeactivate Route Guard. It checks if the form can be deactivated without saving changes.
In Angular, the data fetched by the Route Resolver can be accessed in the component through the route's _____ property.
- data
- params
- queryParams
- routeData
The blank should be filled with data. The data fetched by the Route Resolver can be accessed in the component through the route's data property.