return value from inside foreach loop in angularjs

I am trying to return a value from inside a foreach loop. I would like to explain it through the code.

Below code is a function where I am looping through the data which I am fetching from the database table via $http method of angular. After looping through I need to loop again because inventory is an array so, again I run foreach loop to get only the qty. I don't know if this is good practice or a bad one but I'm still getting my hands on angular. I have written this function to check if there is a negative quantity and if there is add a class of warning to the tr as written in the code down below. What I want to learn is returning the value from inside the foreach loop. When I try to log the qty inside of the loop it logs fine but outside of it does not. I have tried searching but could not find answers to it and that is why posting my question.

$scope.invPrice = function(){
 for(var i in $scope.tableData)
 {
   $scope.pprice = $scope.tableData[i].inventory;
    angular.forEach($scope.pprice, function(index) {
     var qty = 0;
     $scope.qty = index.qty;
     qty = $scope.qty;
     console.log(qty)  //logs the qty
    });
 };
return qty;
};

<tr ng-class="{warning: invPrice() < 0}">