[Angular] Control the dependency lookup with @Host, @Self, @SkipSelf and @Optional

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[Angular] Control the dependency lookup with @Host, @Self, @SkipSelf and @Optional

Very differently to AngularJS (v1.x), Angular now has a hierarchical dependency injector. That allows to specify service definitions as well as the service lifetime at various levels in our application. Whenever a service is requested, Angular will w…

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An Angular service registered on the NgModule is globally visible on the entire application. Moreover it is a singleton instance, so every component that requires it via its constructor, will get the same instance. However this is not always the desi…

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The upload class will be used in the service layer. Notice it has a constructor for file attribute, which has a type of File. This will allows us to initialize new uploads with a JavaScript File object. You will see why this is important in the next…

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