Cannot set property in an object in angular js

Question

$scope.objectData = {};
$scope.objectData[key]["digits"] =  set.first+','+set.second+','+set.third+','+set.fourth;

here key is a numerical value.The error is

TypeError: Cannot set property 'digits' of undefined

Answer 1

You need to set the value of $scope.objectData[key] to an object before you can add more keys to it.

$scope.objectData[key] = {};
$scope.objectData[key]['digits'] = 'foo';

Answer 2

You first have to initalize the object $scope.objectData[key] so the right code would be:

$scope.objectData = {};
$scope.objectData[key] = {};
$scope.objectData[key]["digits"] = set.first+','+set.second+','+set.third+','+set.fourth;