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Services (NgModule (providers:[ServiceClassName] (injected the…

- - - - services
      - pipes
      - components
- - - - atomic
      - non-atomic
      - aliasing
      - factories
  - - - @ Injectable ()
    - - Inject
        
        in the constructor(propertyName: ServiceClass)
      - NgModule
        
        providers: [ServiceClass]
      - Component
        
        providers: [ServiceClass]
        
        new instance for every component!
        
        *ngIf
        
        destroys
        
        creates
        
        new instance each time!
- - - - provide: ServiceClass
        
        really a shorhand for object
        
        { provide: ServiceClass,
        useClass: ServiceClass }
      - useClass: AnotherServiceClass
        
        implements same interface as provide property
        
        used where provide class would have been used
      - how to use?
        
        pass through component
        
        content projection
        
        ng-content
        
        providers[] in decorator
        
        wraps component
        
        switches services
  - - - because components
- - - - provider token
        
        name of the class
        
        eg. ServiceService
        
        parameter type
        
        in the constructor
        
        ie constructor(propertyName: ServiceService)
    - - uses provider token
      - checks providers: []