Events in RxSwift

let heySequence = Observable.from(["H","e","y"])
let subscription = heySequence.subscribe { event in
  switch event {
      case .next(let value):
          print("onNext Event: \(value)")
      case .error(let error):
          print(error)
      case .completed:
          print("onCompleted")
  }
}

Result:
onNext Event: H
onNext Event: e
onNext Event: y
onCompleted