filter method

@override Option<T> filter(@noFutures bool noFutures(T value))

Returns None if the predicate noFutures returns false. Otherwise, returns the original Option.

⚠️ Callback must not throw

Option<T> has no Err variant. Throwing predicates escape to the caller. If your predicate can fail, lift it via Sync(() => p(value)).

Implementation

@override
@pragma('vm:prefer-inline')
Option<T> filter(@noFutures bool Function(T value) noFutures) {
  return noFutures(value) ? this : const None();
}