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Angular Singleton Service Video Lecture | Angular 2 tutorial - Front-End Programming

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FAQs on Angular Singleton Service Video Lecture - Angular 2 tutorial - Front-End Programming

1. What is a singleton service in Angular?
Ans. A singleton service in Angular is a type of service that is created only once during the application's lifetime. This means that there is only one instance of the singleton service that is shared across all components and modules in the application.
2. Why would I use a singleton service in Angular?
Ans. Singleton services are commonly used in Angular for scenarios where you need to share data or functionality across multiple components. By using a singleton service, you can ensure that there is only one instance of the service, making it easier to manage and share data or functionality between components.
3. How do I create a singleton service in Angular?
Ans. To create a singleton service in Angular, you need to provide the service at the root level. This can be done by adding the `@Injectable` decorator to the service class and including it in the `providers` array of the root module (usually AppModule) or using the `providedIn: 'root'` property in the `@Injectable` decorator.
4. Can I have multiple instances of a singleton service in Angular?
Ans. No, by definition, a singleton service in Angular is intended to have only one instance throughout the application. Angular's dependency injection system ensures that the same instance of the singleton service is shared across all components and modules.
5. How do I access a singleton service in Angular components?
Ans. To access a singleton service in Angular components, you need to inject it into the component's constructor using dependency injection. Angular's dependency injection system will automatically provide the instance of the singleton service to the component. You can then use the injected service instance to access its properties and methods within the component.
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