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Publishers and Subscribers in Combine.
import Foundation
import Combine
let publisherArr = [1.0, 2.0, 3.0, 4.0, 5.0, 6.0].publisher
// publisher is of type Publishers.Sequence<[Double], Never>
// the generic type here takes two arguments <Output, Failure>
// in this case the our publisherArr will "Never" fail.
// there are many publishers that can fail, take for example the URLSession.shared.dataTaskPublisher
// the Output is <Data, URLResponse>
// the Failuer is URLError
let dataTaskPublisher = URLSession.shared.dataTaskPublisher(for: URL(string: "")!)
.sink(receiveCompletion: { (completion) in
}) { (cohort) in
print("received value: \(cohort)")
// above we use .sink to subscribe to the values emitted from the publisherArr
// playground output:
received value: 1.0
received value: 2.0
received value: 3.0
received value: 4.0
received value: 5.0
received value: 6.0
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