What are some advanced dependency injection techniques in Angular?

What are some advanced dependency injection techniques in Angular?

Advanced dependency injection techniques in Angular include hierarchical injectors, multi-providers, and using factories for dynamic services.

Can you explain hierarchical injectors?

Hierarchical injectors allow you to create a tree of injectors, where child components can inherit services from their parent injectors, enabling more granular control over service instances.

What are multi-providers?

Multi-providers allow you to provide multiple instances of a service under the same token, which can be useful for implementing plugins or handling multiple configurations.

How do factories work in DI?

Factories in Angular DI are functions that return an instance of a service. They allow for dynamic creation of services based on certain conditions or parameters.

Can you give an example of using a factory?

Sure! You can create a factory that returns different service instances based on user roles, allowing for role-based service access.