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Instantiate a Service using an Angular Factory Provider

Sometimes you need to have full control of how a service is instantiated at runtime. Consider for instance a logging service that gets the information of whether it is enabled or not via its constructor. Angular’s DI won’t be able to determine that value as it is something that needs to be provided explicitly. Factory providers in Angular allow to define a function which will then be called by the dependency injector to construct the given service instance.

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