Iterable's whereType method behaviour

Question

I am having problem with understanding how iterable's whereType works.

I have following example and I have no idea why it is behaving this way. Having this code:

List<dynamic> list = ["SomeString", 12];
print(list);
print(list.whereType<String>());
print(list.where((item) => item is String));

The output is:

[SomeString, 12]
(SomeString, 12)
(SomeString)

I would expect only String in second print. Could someone explain to me why I am wrong?

Answer 1

I think this is an inconsistency because whereType is designed for Dart2 but Dart2 is not complete.

There is an open issue that looks similar

• https://github.com/dart-lang/sdk/issues/32423

dart --reify-generic-functions my_script.dart

should make it work