javascript - Getting an error message when trying to push to an array -

i have following code:

  if (typeof $scope.grid.data == 'undefined') {         $scope.grid.data = [];   }   $scope.grid.data.push(result);

i put in check undefined still getting error message push saying:

typeerror: cannot call method 'push' of null

any advice appreciated

i've been fine simple :

if (!$scope.grid.data) {     $scope.grid.data = []; }

this should catch in both situations (null & undefined).

Detect