struct DivisionByZeroError: Error {
    
}

struct MyGenericError: Error {
    var wrappedError: Error
}

func myDivide(_ dividend: Double, _ divisor: Double) throws -> Double {
       guard divisor != 0 else { throw DivisionByZeroError() }
       return dividend / divisor
   }


let divisors: [Double] = [5, 4, 3, 2, 1, 0]
divisors.publisher
    .tryMap { try myDivide(1, $0) }
    .mapError { MyGenericError(wrappedError: $0) }
    .sink(
        receiveCompletion: { print ("completion: \($0)")} ,
        receiveValue: { print ("value: \($0)", terminator: " ") }
     )