getting issue in Dart

Question

  addorRemCcToList(EmployeeList item) {
print('add or');
print(_ccToListSelected.length);
print(_tempccToListSelected.length);
if (_tempccToListSelected.contains(item)) {
  _tempccToListSelected.remove(item);
} else {
  _tempccToListSelected.add(item);
}
print(_tempccToListSelected.length);
print(_ccToListSelected.length);
notifyListeners();

}

so this is a method through which i'm adding or removing items in _tempccToListSelected this list but the issue is when i make changes in _tempccToListSelected this list this _ccToListSelected list get the same changes and i didn't event touched it as you can see in the picture it is the terminal showing the print result

Answer 1

You certainly have a line like this:

_tempccToListSelected = _ccToListSelected;

or the opposite.

This line don't copy list into another one but make a pointer to the other list (like in numerous language).

If you want to copy (duplicate) the liste use spread operator:

_tempccToListSelected = [..._ccToListSelected];

Answer 2

If you have code like this:

list1 = [];
list2 = list1;

this error is normal. You need give more information about this issue.