angular dependency injection
angular dependency injection
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Dependency Injection:
application design pattern
Is a technique whereby it is supplied with the dependencies it needs rather than creating it.
Enables loose coupling
Dependency Injection in Angular:
Own DI system
Injector is responsible for providing dependcies
Relies on the provider as it tells an injector how to create the service
Configure injector with provider in three ways
In the @Injectable() decorator for the service itself.
In the @NgModule() decorator for an NgModule.
In the @Component() decorator for a component.
Two levels of injector
Root level injector when bootstrapped.
Component level injector when Component is configured with provider.
Hierarchical Dependency Injection System
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