retainWhere method

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

Removes all objects from this list that fail to satisfy test.

An object o satisfies test if test(o) is true.

var numbers = ['one', 'two', 'three', 'four'];
numbers.retainWhere((item) => item.length == 3);
numbers.join(', '); // 'one, two'

The list must be growable.

Implementation

@override
void retainWhere(bool Function(T element) test) {
  super.value.retainWhere((e) {
    if (test(e)) {
      return true;
    }
    return false;
  });
  if (notifyOnChangeList) {
    notifyListeners();
  }
}