How do I use dependency injection in Angular?

How do I use dependency injection in Angular?

Dependency injection in Angular is a design pattern that allows you to create and manage service instances. You can inject services into components, directives, or other services.

Can you give me an example of how to inject a service into a component?

Sure! First, create a service using the Angular CLI: ng generate service my-service. Then, in your component, import the service and inject it via the constructor.

What if I want to provide the service at a different level, like in a module?

You can provide the service in a module by adding it to the providers array in the module's decorator. This makes the service available to all components in that module.

Are there any best practices for using dependency injection in Angular?

Yes, some best practices include keeping services stateless, using providedIn for tree-shakable services, and avoiding circular dependencies.