How to clear an angularJS array

Question

 $scope.itemarray = ['A', 'B', 'C'];   

this will clear the array but the ui wont be updated.

$scope.itemarray = []; 

this works fine! why?

 $scope.itemarray.length = 0;   

Answer 1

$scope.itemarray.length = 0; << this is correct. Length is read-write property.

$scope.itemarray = []; << this creates new empty array. If you have bindings to old itemarray, they may be lost. (Html binding like ng-if="itemarray[0]" wont be lost)