Is it possible to filter a List with a function that returns Future?

Question

I have a list List<Item> list and a function Future<bool> myFilter(Item).

Is there a way to filter my list using the Future returning function myFilter()?

The idea is to be able to do something like this:

final result = list.where((item) => myFilter(item)).toList();

But this is not possible since where expects bool and not Future<bool>

Answer 1

Since the iteration involves async operation, you need to use a Future to perform the iteration.

final result = <Item>[];
await Future.forEach(list, (Item item) async {
  if (await myFilter(item)) {
    result.add(item);
  }
});