Next to creating controllers and directives, AngularJS also supports “singleton” services. Services, like on the server-side, offer a great way for separating logic from your controllers. In AngularJS anything that’s either a primitive type, function or object can be a service. Although the concept of service is quite straight forward, the declaration of them in AngularJS isn’t:

• There are 4 different ways to declare a service.
  • Registering a existing value as a service
  • Registering a factory function to create the singleton service instance
  • Registering a constructor function to create the singleton service instance
  • Registering a service factory which can be configured
• Only 1 of them is extensively documented

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