Basics of Combine

comb4.swift

let sequence = Publishers.Sequence<[String], Never>(sequence: ["Hello", "World”])

sequence
    .sink(receiveCompletion: { (completion) in
        switch completion {
        case .finished:
            print("Finished")
        case .failure(let error):
            print("Finished with error \(error)")
        }
    }) { (value) in
        print("Received value: \(value)")
}

Output: 
    Received value: Hello
    Received value: World
    Finished