Creating angular base service and sub services - angularjs

Question

I'm trying to create a general service for dynamic listing objects i angular and for different types of Objects I need slightly different methods for this service. So I thought it would be the best to have a base service and some sub-services. The problem is, that I need to initialize the base service with different Objects depending on sub-service.
So that what I got so far:
Base List-Service (shortened to the relevant)
App.factory('List', ['$q',
function (){
var List = function(Item, searchParams){
this.Item = Item;
this.searchParams = searchParams;
//....
this.nextPage();
};
//.....
List.prototype.nextPage = function () {
//.....
this.Item.find({
//.....
}.bind(this));
};
return List;
}]);
Sub-service of List-Service
App.factory('UserList', [
'User', 'List','$q',
function (User, List) {
UserList = function(){
var searchParams = {
// params Object
};
return new List(User, searchParams);
};
// extend base class:
UserList.prototype.updateUser = function(id){
//.....
}
//....
return UserList;
}]);
Currently just the UserList is loaded, but: Of course it loads every time a new instance, due the new operator when it's called, but I just want one instance. But leaving the new operator throw's an error that this.nextPage(); would be undefined function. Beside this it seems the extension function updateUser is not applied.
So what's the best practice to inherit from other service with passing arguments to parent service in angular?

Answer 1

I gotta work it.
changed sub service to this to inherit proper from base:
App.factory('UserList', [
'User', 'List','$q',
function (User, List) {
var UserList = function(){
var searchParams = {
//.....
};
List.call(this, User, searchParams);
};
// inherit from List service
UserList.prototype = Object.create(List.prototype);
UserList.prototype.updateUser = function(id) {
//.....
};
return UserList;
}
])
;