Angular $watch | returning the item from function

Question

I\'m interested to find out why i always have to do this

$scope.$watch( function() {
   return $scope.someData;
}, function( value ) {
   console.log( value         


        

Answer 1

With a factory, you need to watch a function because if you pass a string, Angular will evaluate it as an expression against the $scope. Since $data.someData is not defined on your $scope, it won't work.

To elaborate on @Codezilla's comment, you could assign your factory data to some $scope property, and then watch that:

$scope.data = $data.someData;
$scope.$watch('data', function(newValue) { ... });