retainWhere method

@override void retainWhere(bool test(E element))

Removes all elements not matched by test from the queue.

The test function must not throw or modify the queue.

Implementation

@override
void retainWhere(bool Function(E element) test) {
  final length = super.length;
  super.retainWhere(test);
  if (length != super.length) {
    notifyListeners();
  }
}