retainWhere method Null safety

  1. @override
void retainWhere(
  1. bool test(
    1. String?
    )
)
override

Removes all elements of this set that fail to satisfy test.

final characters = <String>{'A', 'B', 'C'};
characters.retainWhere(
    (element) => element.startsWith('B') || element.startsWith('C'));
print(characters); // {B, C}

Implementation

@override
void retainWhere(bool Function(String?) test) => _inner.retainWhere(test);