PassthroughSubject.swift

let subject = PassthroughSubject<String, Error>()
subject.send("Is anyone listening?")

let subcription1 = subject.sink(receiveCompletion: {
    print("1) \($0)")
}, receiveValue: {
    print("1) \($0)")
})

let subscription2 = subject.sink(receiveCompletion: {
    print("2) \($0)")
}, receiveValue: {
    print("2) \($0)")
})

subject.send("Hello")
subject.send(completion: .finished)
subject.send("Is alive?")

<Output>
1) Hello
2) Hello
1) finished
2) finished