foo.js

// <input ng-model="foobar">
// $scope.foobar is an object with attribute 'baz'

$scope.foo = _.map($scope.barArray, function(bar) {
  if(bar.baz === $scope.foobar.baz) {
    return bar;
  }
});

// after uglifying, i cannot access $scope.foobar.baz in the _.map anymore
// the error is something like 'Undefined method or variable baz for null'