Do factory and service represent examples of Declarative Programming within AngularJS?

Angular JS involves the declaration of services and factories. Services are created by declaring functions that we do not manually call ourselves.

Could this be considered declarative programming, with the framework handling the imperative tasks?

What exactly is the background imperative work being performed?

Answer №1

Indeed, Angular handles most of the imperative tasks related to the lifecycle of instances. Here are some key things that Angular manages for you:

  • Every service, factory, and provider declared in Angular provides Angular with either a constructor function or an instance created by a factory. Constructors return objects with a $get() method that yields an instance of the provider. You can learn more about this concept here.
  • All services in Angular are singletons, meaning they are only instantiated once (typically when first injected into a controller, directive, or other component). This allows for shared state among different entities that use the same service.
  • Under the hood, Angular creates providers for each service/factory with the provider's name followed by "Provider."

Controllers, directives, and filters behave similarly to services but require special handling due to scope/input injection requirements. Angular takes care of managing these components as well.

After using Angular extensively for six months, I've realized that I rarely need to use the new keyword anymore. Angular efficiently handles instance creation and destruction so you don't have to worry about it.

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