Angular #25 - Parameter Decorator @Inject()
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Decorators are functions that are invoked with a prefixed @ symbol, and are immediately followed by a class, method or property. They allow a service, directive or filter to be changed before being used. Basically, a decorator provides configuration metadata that determines how the component, class or a function should be processed, instantiated and used at runtime.
Angular defines a number of decorators that attach specific kinds of metadata to classes, so that the system knows what those classes mean and how they should work.
There are various types of in-built decorators.
Class Decorators
Property Decorators
Method Decorators
Parameter Decorators