javascript - Cannot set property in an object in angular js -

this question has answer here:

• javascript - cannot set property of undefined 4 answers

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

here key numerical value.the error

typeerror: cannot set property 'digits' of undefined 

you need set value of $scope.objectdata[key] object before can add more keys it.

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