Dependency injection is the ability to add the functionality of components at runtime. Let's take a look at an example and the steps used to implement dependency injection.
Step 1 − Create a separate class which has the injectable decorator. The injectable decorator allows the functionality of this class to be injected and used in any Angular JS module.
@Injectable()
export class classname {
}
Step 2 − Next in your appComponent module or the module in which you want to use the service, you need to define it as a provider in the @Component decorator.
@Component ({
providers : [classname]
})
