Injectable Class Means Dependencies Loaded Automatically

Angular's Dependency Injection (DI) is based on injectable classes, which load dependencies when the class is built into an object with new.

@Injectable()
export class TodoEffects {
  constructor(
    private actions$: Actions,
    private store: Store<AppState>,
    private todoService: TodoService
  ) {}
}

code excerpt from Josh Morony's video on ngRX here: https://www.youtube.com/watch?v=kx0VTgTtSBg&list=WL&index=4

Incidentally, there are an extremely large number of concepts in modern web apps which borrow from the ideas of Angular and RXJS (reactive state). It almost makes sense to get a hang of these ideas if only for a history lesson. I think these are great fundamentals either way.

Also, async programming (the JS style) is like a slinky. It's not coming directly down the stairs, but once you drop it, you know it's getting there.