flatMap --> Publishers.MergeMany --> map --> collect
When you have a Publisher which has an Output that is a sequence. FlatMany makes it easy to map each element of that sequence into a publisher.
import FlatManylet task = Just<[Int]>([1, 2, 3])
.flatMany {
Just("\($0 * $0)").eraseToAnyPublisher()
}
.sink { values in
print(values)
}