In NgRx, which entity describes the type and payload of an action that represents changes in the state?
- Action
- Reducer
- Selector
- State
In NgRx, an "Action" describes the type and payload of an action that represents changes in the state. Actions are dispatched to notify the store of specific events or changes in your application. They carry information about what happened.
How can Angular's AOT compilation reduce the size of the final JavaScript bundle?
- By caching HTTP requests
- By eliminating unused code and dead code elimination
- By optimizing runtime performance
- By reducing the size of images and assets
Angular's Ahead-of-Time (AOT) compilation reduces the size of the final JavaScript bundle by eliminating unused code through tree-shaking and dead code elimination. It analyzes the application's code and includes only the parts that are actually used, resulting in a smaller bundle size and faster load times.
In NgRx, to handle asynchronous operations like HTTP requests, one would use ________.
- Actions
- Effects
- Reducers
- Selectors
In NgRx, asynchronous operations like HTTP requests are typically handled using Effects. Effects are responsible for managing side effects and triggering actions based on these effects, making them a crucial part of managing async operations in an NgRx-based application.
To dynamically create components at runtime, one should use the ________ service.
- ComponentFactoryResolver
- ChangeDetectionStrategy
- AngularInjector
- DependencyInjection
To dynamically create components at runtime in Angular, you should use the ComponentFactoryResolver service. This service allows you to resolve and create components dynamically, a valuable feature when dealing with dynamic UI elements or component-based applications. The other options are not related to dynamic component creation.
If a route's path is set as an empty string (''), it often represents the ________ route of the application.
- Default
- Home
- Primary
- Root
If a route's path is set to an empty string (''), it typically represents the Root route of the application. This means that when the application is accessed without any specific route, the route with an empty path ('') will be considered, often serving as the main entry point or home page of the application.
What is the purpose of the ControlValueAccessor interface in Angular forms?
- It is used to access form control values in JavaScript code.
- It enables custom form controls to work with Angular's reactive forms.
- It provides a way to access the values of a FormGroup.
- It allows you to control the layout of form elements in Angular templates.
The ControlValueAccessor interface in Angular forms is used to enable custom form controls to work seamlessly with Angular's reactive forms. It acts as a bridge between the custom form control and Angular's form infrastructure, allowing the control to interact with form directives, template-driven forms, and reactive forms. Options 1, 3, and 4 do not accurately describe the purpose of ControlValueAccessor.
Which method is commonly used to initialize and construct a form model in Reactive Forms?
- FormBuilder.group()
- FormGroup.create()
- FormControl.initialize()
- FormModel.construct()
In Reactive Forms, the commonly used method to initialize and construct a form model is FormBuilder.group(). This method is part of the FormBuilder service and is used to create an instance of FormGroup, which represents the form model. The other options are not standard methods for initializing form models in Angular's Reactive Forms.
You have been tasked with improving the initial load time of an Angular application. Which of the following techniques would be most effective?
- Increasing Server RAM
- Lazy Loading
- Minifying CSS and JS
- Using a Bigger CDN
Lazy Loading is a technique in Angular that loads modules only when they are needed, reducing the initial load time of an application. It's a powerful method to optimize performance by loading only what's necessary upfront.
When creating hierarchical injectors, child injectors can ________ services from parent injectors.
- 'access'
- 'inherit'
- 'isolate'
- 'override'
When creating hierarchical injectors, child injectors can 'access' services from parent injectors. This means that components or services in the child injector can access and use services provided in the parent injector, allowing for hierarchical sharing of services while maintaining encapsulation and isolation.
What would be a primary reason to use a Subject over a standard Observable in RxJS?
- To create Observables from scratch
- To debounce user input
- To handle async operations
- To multicast emissions to multiple subscribers
A primary reason to use a Subject over a standard Observable in RxJS is to multicast emissions to multiple subscribers. Subjects are both an Observable and an Observer, making them suitable for scenarios where multiple subscribers need to receive the same values.