.deferred { future in future(.success(2)) }.handleEvents(receiveCompletion: { _ in print("completed 2") }) publisher1.then(publisher2) .sink { print($0) } // output: // completed 1 // 2 // completed 2 ">

let publisher1 = Future<Int, Never>.deferred { future in
    future(.success(1))
}.handleEvents(receiveCompletion: { _ in
    print("completed 1")
})

let publisher2 = Future<Int, Never>.deferred { future in
    future(.success(2))
}.handleEvents(receiveCompletion: { _ in
    print("completed 2")
})

publisher1.then(publisher2)
    .sink {
        print($0)
    }

// output: 
// completed 1
// 2
// completed 2

let publisher = Future<Void, Never>.deferred { future in
    print("started")
    future(.success(()))
}.shareReplay(1)

publisher
    .sink(receiveCompletion: { _ in },
          receiveValue: {})
    .store(in: &cancellables)

publisher
    .sink(receiveCompletion: { _ in },
          receiveValue: {})
    .store(in: &cancellables)

// output:
// started

let future = Future<Void, Error>.deferred { future in
    print("started")
    future(.success(()))
}
print("before")
future.sink(receiveCompletion: { _ in },
            receiveValue: { _ in })
    .store(in: &cancellable)
print("after")

// output:
// before
// started
// after