Creating service Services

The service method provides the ability to implement functionality into a server. However, the service method works slightly differently from the factory method. The service method accepts a constructor function as the second argument and uses it to create a new instance of an object. The service method uses the following syntax, where name is the service name and constructor is a constructor function:

service(name, constructor)

The service method can also accept dependency injection. The following code implements a basic service method that provides an add() function and a multiply() function:

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var app = angular.module('myApp', []);
app.constant('myConst', 10);
function ConstMathObj(myConst) {
  this.add = function(value){ return value + myConst; };
  this.multiply = function(value){ return value * myConst; };
}
app.service ('constMath', ['myConst', ConstMathObj] );

Notice that the ConstMathObj constructor is created first, and then the service() method calls it and uses dependency injection to insert the myConst service.