How does Akita differ in its approach to state management compared to NgRx?
- Employs Redux-style pattern with actions and reducers
- Favors a component-based state management approach
- Uses a simpler, more declarative approach
- Utilizes MobX for reactive state management
Akita differs from NgRx by using a simpler and more declarative approach to state management. It provides a straightforward way to manage state in Angular applications without the boilerplate associated with Redux-style patterns.
You have a shared service that maintains user settings. You notice that different parts of the application have different instances of this service. What could be a possible reason?
- Different parts of the application are using different configurations, which require separate instances of the service.
- The application is not using a proper dependency injection framework.
- The shared service is being loaded with lazy loading modules, leading to multiple instances.
- There is a bug in the shared service causing it to create multiple instances.
Different parts of the application may require different configurations or data, which necessitates separate instances of the shared service. This allows each part of the application to have its own instance with specific settings or configurations. It's not a bug or dependency injection issue but rather a design choice to accommodate varying requirements.
You're creating a feedback form where users can rate a product. You want to ensure users provide a rating between 1 to 5. How would you validate the input to ensure values are within this range?
- Use client-side JavaScript to restrict input to values between 1 and 5.
- Implement server-side validation to check the rating before storing it.
- Utilize Angular's Validators to create a custom validation rule for the rating field.
- Allow users to enter any value and provide an error message if it's not within the range after submission.
To validate user input for a rating between 1 to 5 in an Angular form, you would use Angular's Validators to create a custom validation rule (Option 3). This ensures the validation occurs on the client side. Server-side validation (Option 2) is important but doesn't prevent invalid values from being submitted. Option 1 restricts input but doesn't provide feedback, and Option 4 is less user-friendly.
Your application has a dynamic form where fields can be added or removed based on user input. Which feature of Angular's Reactive Forms would you leverage to accomplish this?
- Create a separate component for each dynamic form field.
- Implement dynamic forms using Angular's template-driven approach.
- Use the ngIf directive to conditionally render form fields.
- Utilize form arrays to dynamically add or remove form controls.
In Angular's Reactive Forms, you would leverage form arrays to dynamically add or remove form controls based on user input in a dynamic form. The ngIf directive is more suitable for conditionally rendering existing elements in the DOM, not for dynamically managing form controls. Creating a separate component for each dynamic form field is not the recommended approach for dynamic forms, and Angular's template-driven approach is less flexible in handling dynamic forms than Reactive Forms with form arrays.
Which directive is utilized to switch between multiple views, but only one view can be displayed at a time?
- *ngFor
- *ngIf
- *ngModel
- *ngSwitch
The *ngSwitch directive in Angular is used to switch between multiple views, but only one view can be displayed at a time based on a specified condition. It's commonly used for rendering different templates or components depending on the value of an expression. The other directives listed, such as *ngFor, *ngIf, and *ngModel, have different purposes and don't provide the same view-switching behavior.
When dynamically creating a component, which object is responsible for providing the factory to create an instance of the component?
- ComponentFactoryResolver
- ElementRef
- NgModule
- ViewChild
The ComponentFactoryResolver is responsible for providing the factory to create an instance of a component dynamically in Angular. It's a crucial part of dynamic component creation, allowing you to create components on the fly based on specific conditions or requirements in your application. NgModule deals with module-level configuration, ViewChild is used for querying child components, and ElementRef is used for accessing the DOM element of a component, but none of these directly provide a factory for dynamic component creation.
To apply styles scoped to a particular component and prevent them from affecting other elements outside the component, you would use _____.
- ::ng-deep
- ViewEncapsulation.Emulated
- ViewEncapsulation.None
- ng-deep
To apply styles scoped to a particular component in Angular and prevent them from leaking out and affecting other elements, you would use the ::ng-deep selector. This is used to pierce through the view encapsulation and apply styles to specific components.
For handling multiple values over time in Angular, you would use ________ instead of Promises.
- Components
- Decorators
- Modules
- Observables
In Angular, when you need to handle multiple values over time, you should use Observables instead of Promises. Observables are more versatile and allow you to work with asynchronous data in a more flexible manner. They can emit multiple values, making them ideal for scenarios like handling streams of data from HTTP requests or user interactions.
You have a multi-step registration process where each step is its own route. A user should not proceed to the next step without completing the previous one. How would you enforce this in Angular?
- Implementing route guards to prevent navigation to the next step until the current step is completed.
- Using conditional statements to hide the next step until the current step is completed.
- Storing step completion status in a browser cookie and checking it during navigation.
- Reloading the page after each step to ensure step completion.
In Angular, you can enforce the requirement that a user should not proceed to the next step without completing the previous one by implementing route guards. Route guards are Angular's way of protecting routes and can be used to prevent navigation until certain conditions, such as step completion, are met. The other options are not recommended practices for enforcing this requirement in an Angular application.
When using , which lifecycle hook is ideal for accessing projected content inside the child component?
- ngAfterContentInit()
- ngAfterViewInit()
- ngOnChanges()
- ngOnInit()
When using , the ideal lifecycle hook for accessing projected content inside the child component is ngAfterContentInit(). This hook is triggered after content projection has taken place, allowing you to work with the projected content effectively. ngOnInit() is too early in the component lifecycle, and ngOnChanges() and ngAfterViewInit() are not specifically related to content projection.