How can you achieve nested routing (child routes) within an Angular application?
- By defining child routes in the RouterModule
- By using Angular's loadChildren feature
- By using Angular's canActivateChild guard
- By applying a deep route nesting hierarchy
To achieve nested routing (child routes) in Angular, you define child routes within the RouterModule configuration. This allows you to create a hierarchical structure of routes. The other options relate to Angular's routing features but do not specifically address the process of achieving nested routes.
What is a potential drawback of not using lazy loading in larger applications?
- Increased memory usage
- Larger initial bundle size
- Reduced component reusability
- Slower application startup
Not using lazy loading in larger applications can result in a larger initial bundle size. This means that users need to download a bigger JavaScript file when they first access the application, which can lead to slower loading times, especially on slower network connections.
Which option is NOT a valid view encapsulation mode in Angular?
- Emulated
- Shadow DOM
- None
- Native
In Angular, the valid view encapsulation modes are Emulated (default), Shadow DOM, and Native. The "None" option is not a valid view encapsulation mode. View encapsulation modes determine how Angular styles are applied and scoped in a component. "None" is not a recognized mode for Angular view encapsulation.
In the context of state management in Angular, what is the role of "selectors"?
- Selectors are responsible for dispatching actions
- Selectors are used to derive data from the store
- Selectors handle side effects
- Selectors provide routing functionality
In Angular state management, "selectors" play a crucial role in deriving and transforming data from the store. They allow you to compute and return specific slices of the application state, making it easier to access and display relevant data in components.
In Angular's dependency injection, what is the difference between a service provided in 'root' and one provided in a module?
- Services provided in 'root' are lazy-loaded, while those in a module are eager-loaded
- Services provided in 'root' are singletons, while those provided in a module are scoped to that module
- Services provided in 'root' cannot have dependencies, while those in a module can
- Services provided in 'root' have wider accessibility, while those in a module are private
When a service is provided in the 'root' of an Angular application, it becomes a singleton. This means there's only one instance of the service for the entire application. Services provided in a module are scoped to that module, creating a new instance for each module that imports it.
You're building a tab component system where each tab can have custom content. Which Angular feature would be most appropriate to allow users to define content for each tab?
- Content Projection (ng-content)
- Dependency Injection (DI)
- Input Properties (Bindings)
- Output Properties (Events)
In Angular, Content Projection (ng-content) is the most appropriate feature to allow users to define custom content for each tab. It allows users to pass in content that will be inserted into designated placeholders within your component. Input properties allow data binding, output properties handle events, and Dependency Injection is used for providing services, making Content Projection the correct choice for this scenario.
For a CanDeactivate guard, which method parameter allows you to access the current instance of the component being deactivated?
- component
- componentInstance
- currentComponent
- instance
In a CanDeactivate guard, the componentInstance parameter allows you to access the current instance of the component being deactivated. You can use this parameter to interact with the component and make decisions based on its state.
What's a key difference between Just-in-Time (JIT) and Ahead-of-Time (AOT) Compilation in Angular?
- AOT compiles at runtime
- AOT produces readable TypeScript code
- JIT compiles at runtime
- JIT produces smaller bundle sizes
JIT (Just-in-Time) compilation in Angular compiles the application's TypeScript code into JavaScript at runtime, whereas AOT (Ahead-of-Time) compilation compiles the code during the build process, producing optimized and smaller JavaScript bundles, which results in faster loading times and better performance.
For a directive to modify the value of a host property, you would use the ______ decorator.
- ElementRef
- HostBinding
- Input
- Output
For a directive to modify the value of a host property, you would use the HostBinding decorator. HostBinding allows you to bind the value of a directive property to a host element's property, effectively modifying the host element's behavior or appearance. This is useful for creating dynamic and interactive custom directives in Angular.
What does the term "Hierarchical Injector" refer to in Angular?
- A design pattern used to structure Angular components hierarchically.
- A type of dependency injection system in Angular that supports multiple hierarchies.
- An Angular feature that allows for dynamic component hierarchies.
- An Angular feature that automatically sorts components in a hierarchical order.
The term "Hierarchical Injector" in Angular refers to a type of dependency injection system that supports multiple hierarchies. In Angular, services can be provided at various levels of the application, and the hierarchical injector helps manage the scope and accessibility of these services. This is crucial for controlling how services are shared and instantiated within different parts of an Angular application.