JAVASCRIPT

Angularjs different dependency injection for factories inside controller

app.service('FactoryService', function($scope, employerFactory, employeeFactory) {
   var _mode = 0;
   var _factories = [employerFactory, employeeFactory];
   return {
      setMode: function(mode) {
         _mode = mode % (_factories.length - 1);// possibly 0 | 1 in this case, but inject as many factories as you wish
      },
      getFirstName: function() {
         return _factories[_mode].firstName;
      },
      getLastName: function() {
         return _factories[_mode].lastName;
      }
   }
 });
Finally inject it into your controller, and call its methods

app.controller('MyController', function($scope, FactoryService) {

    // select the first factory (employerFactory)
    FactoryService.setMode(0);
    $scope.firstName = FactoryService.getFirstName();
    $scope.lastName = FactoryService.getLastName(); 
    console.log( $scope.firstName, $scope.lastName); 

    // select the second factory (employeeFactory)
    FactoryService.setMode(1);
    $scope.firstName = FactoryService.getFirstName();
    $scope.lastName = FactoryService.getLastName(); 
    console.log( $scope.firstName, $scope.lastName); 
 });