[valenterry]

Yeah, but Usually we just use something like ZIO nowadays. So the code becomes:

    def divisionProgramAsync(inputA: String, inputB: String): IO[String, Double] =
      for {
        a      <- parseDoubleAsync(inputA)
        b      <- parseDoubleAsync(inputB)
        result <- divideAsync(a, b)
      } yield result

(the annoying wrapping/unwrapping isn't necessary with ZIO here)

You can also write this shorter if you want:

    def divisionProgramAsync(inputA: String, inputB: String): IO[String, Double] =
      for {
        (a, b) <- parseDoubleAsync(inputA) <*> parseDoubleAsync(inputB)
        result <- divideAsync(a, b)
      } yield result