When using NgRx, what is the role of an "Effect"?
- Effects are responsible for UI rendering
- Effects handle asynchronous side effects like HTTP requests
- Effects manage routing in the application
- Effects provide data binding between components
In NgRx, "Effects" are responsible for managing asynchronous side effects in a predictable way. They are commonly used to handle actions like making HTTP requests, interacting with local storage, and performing other asynchronous operations without directly mutating the state.
You're building an e-commerce application and want to navigate the user to a "Thank You" page after a successful purchase. Which Angular feature would be most appropriate to use for this type of navigation?
- Using Angular's Router to navigate programmatically using router.navigate method.
- Utilizing Angular's @ViewChild decorator to manually change the view.
- Implementing a custom navigation service in Angular.
- Employing the window.location.href method for navigation.
In Angular, you should use the Angular Router feature to navigate the user to a "Thank You" page after a successful purchase. The router.navigate method allows for programmatic navigation within your Angular application. This approach ensures that the navigation is handled by Angular's routing mechanism, enabling a seamless user experience. The other options are not appropriate for handling routing and navigation in Angular applications.
A developer on your team is unfamiliar with Angular and accidentally removes a necessary package. Which Angular CLI command would help you ensure that the application's dependencies are correctly installed?
- ng eject
- ng install
- ng serve
- ng update
The ng update command in Angular CLI helps manage and update your application's dependencies, ensuring that packages are correctly installed and up-to-date. It's a crucial command for maintaining Angular applications.
During testing, you notice that a component's view is not updating after changing a property. What might you consider doing to address this?
- Check if the property binding is correctly set
- Remove any *ngIf conditions from the template
- Use ngOnInit instead of ngAfterViewInit
- Verify if change detection is triggered using ChangeDetectorRef
In this scenario, you should consider verifying if change detection is triggered using ChangeDetectorRef. Angular relies on change detection to update the view when data changes, so ensuring that it is properly triggered is crucial for view updates.
How can you configure different environments (e.g., development, production) in an Angular application using Angular CLI?
- Configure environments in the app.module.ts file
- Define environment variables in the package.json file
- Modify the Angular application's code directly
- Use environment-specific configuration files (e.g., environment.ts, environment.prod.ts)
In Angular, you can configure different environments by using environment-specific configuration files such as environment.ts and environment.prod.ts. These files contain variables and settings that can be switched based on the target environment, allowing you to manage configurations easily.
Which command in Angular CLI generates a new service?
- ng add service
- ng create service
- ng generate service
- ng new service
The correct command for generating a new service in Angular CLI is ng generate service. Services are used to encapsulate and share logic and data across different parts of your Angular application.
The ______ is a container where one or more views can be attached to a component.
- ComponentContainer
- ComponentHolder
- ComponentView
- ViewContainer
The ViewContainer is a container where one or more views can be attached to a component. Views can be dynamically created and added to this container, allowing for dynamic rendering of components in frameworks like Angular. Understanding how to use ViewContainers is crucial for creating dynamic user interfaces.
You are tasked with ensuring that specific headers are added to every HTTP request in your Angular application. How would you achieve this?
- Create an HTTP interceptor
- Manually add headers to each request
- Modify the Angular configuration file
- Use a service to add headers
To ensure specific headers are added to every HTTP request, you should create an HTTP interceptor. Interceptors allow you to intercept outgoing requests and modify them, making it a suitable choice for adding headers uniformly to requests across your Angular application.
Your application has a module that is loaded lazily, and you want to ensure that this module is only loaded for administrators. How would you implement this restriction?
- CanActivateChild
- CanDeactivate
- CanLoad
- Resolve
To ensure that a module is only loaded for specific users (e.g., administrators), you would use the CanLoad route guard. This guard is applied at the route level and checks whether the user is authorized to load a lazy-loaded module.
In Ngxs, what is used to define metadata for state operations?
- Actions
- Decorators
- Middleware
- Reducers
In Ngxs, decorators are used to define metadata for state operations. Decorators like @State, @Selector, and @Action are used to specify how state should be managed, which methods should handle state changes, and how to select data from the state. They simplify the state management process in Ngxs.