Services

Services are the building blocks that Angular provides for the definition of the business logic of our applications. In AngularJS, we had three different ways of defining services:

// The Factory method 
module.factory('ServiceName', function (dep1, dep2, ...) { 
  return { 
    // public API 
  }; 
}); 
 
// The Service method 
module.service('ServiceName', function (dep1, dep2, ...) { 
  // public API 
  this.publicProp = val; 
}); 
 
// The Provider method 
module.provider('ServiceName', function () { 
  return { 
    $get: function (dep1, dep2, ...) { 
      return { 
        // public API 
      }; 
    } 
  }; 
}); 

Although the first two syntactical variations provide similar functionality, they differ in the way the registered service will be instantiated. The third syntax allows further configuration of the registered provider during...