What are the best practices for using providers in Angular?

What are the best practices for using providers in Angular?

When using providers in Angular, it's important to follow a few best practices: 1. Use hierarchical injectors wisely. 2. Prefer @Injectable({ providedIn: 'root' }) for services. 3. Keep services stateless when possible. 4. Use multi-providers for shared functionality.

Can you explain what hierarchical injectors are?

Hierarchical injectors allow Angular to create a tree of injectors, where child components can inherit services from their parent components. This helps in managing service instances and scopes effectively.

What does @Injectable({ providedIn: 'root' }) do?

Using @Injectable({ providedIn: 'root' }) makes the service available application-wide as a singleton, ensuring only one instance is created and shared across the app.

How can I keep services stateless?

To keep services stateless, avoid storing data in the service itself. Instead, pass data through method parameters and return results directly, which makes the service easier to test and reuse.