customizeAsyncAs<R> method

Future<Iterable<R>> customizeAsyncAs<R>(
  1. Future<R> combine(
    1. E element
    ), [
  2. bool checker(
    1. R value
    )?
])

Implementation

Future<Iterable<R>> customizeAsyncAs<R>(
  Future<R> Function(E element) combine, [
  bool Function(R value)? checker,
]) async {
  List<R> initial = [];
  Iterator<E> iterator = this.iterator;
  if (!iterator.moveNext()) return initial;
  R value = await combine(iterator.current);
  if (checker == null || checker(value)) initial.add(value);
  while (iterator.moveNext()) {
    R value = await combine(iterator.current);
    if (checker == null || checker(value)) initial.add(value);
  }
  return initial;
}