Hi Harila...,

just use the function you return in the $watch. And is there an reason you 
are keeping the length in a extra private variable? you could return 
factroyList.length without an issue..

in your controller:
$scope.$watch(servicename.returningListLengthFunction, function (newLen,
oldLen) {
   //do your stuff here..
});

Regards
Sander

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