How dependency injection works in Angular
Dependency injection is an application design pattern that we also come across in other languages, such as C# and Java. As our applications grow and evolve, each of our code entities will internally require instances of other objects, which are better known as dependencies. The action of passing such dependencies to the consumer code entity is known as injection, and it also entails the participation of another code entity, called the injector. The injector is responsible for instantiating and bootstrapping the required dependencies so that they are ready for use when they've been injected into a consumer. This is essential since the consumer knows nothing about how to instantiate its dependencies and is only aware of the interface they implement to use them.
Angular includes a top-notch dependency injection mechanism to expose required dependencies to any Angular artifact of an Angular application. Before delving deeper into this subject...