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Angular 2 Cookbook by Matt Frisbie

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Building a provider-configured service with useFactory

One further extension of dependency injection in Angular 2 is the ability to use factories when defining your provider hierarchy. A provider factory allows you to accept input, perform arbitrary operations to configure the provider, and return that provider instance for injection.

Note

The code, links, and a live example of this are available at http://ngcookbook.herokuapp.com/0049/.

Getting ready

Begin again with the dual service and article component setup shown in Service injection aliasing with useClass and useExisting, earlier in the chapter.

How to do it...

Provider factories in Angular 2 are exactly as you might imagine they would be: functions that return a provider. The factory can be specified ...

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