Difference between angular.copy() and assignment (=).

$cope.context = 'some text';

$scope.master = context;

Thus in the later case, if you we're to change something in $scope.master you would also change context.

But in $scope.master = angular.copy($scope.context);

 angular.copy() performs a deep copy of the argument - essentially creating a new object - whereas using the assignment operator = just assigns reference's.

For more details on angular.copy visit Here.