Differences between service, factory and provider in AngularJs
PDFThe differences between a service, factory and provider are subtle.
It turns out that a service and factory are actually providers that differ in how they return a value. Let me just link the whole thing (credits go to Ben Clinkinbeard and Miško Hevery).
Services
Syntax: module.service( 'serviceName', function );
Result: When declaring serviceName as an injectable argument you will be provided with an instance of the function. In other words new FunctionYouPassedToService().
Factories
Syntax: module.factory( 'factoryName', function );
Result: When declaring factoryName as an injectable argument you will be provided with the value that is returned by invoking the function reference passed to module.factory.
Providers
Syntax: module.provider( 'providerName', function );
Result: When declaring providerName as an injectable argument you will be provided with new ProviderFunction().$get(). The constructor function is instantiated before the $get method is called – ProviderFunction is the function reference passed to module.provider.
Everything is a provider:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | provider.service = function(name, Class) { provider.provide(name, function() { this.$get = function($injector) { return $injector.instantiate(Class); }; }); } provider.factory = function(name, factory) { provider.provide(name, function() { this.$get = function($injector) { return $injector.invoke(factory); }; }); } provider.value = function(name, value) { provider.factory(name, function() { return value; }); }; |