.POBE "QQMJDBUJWF'VODUPSෳͷ'VODUPSΛѻ͏͜ͱ͕Ͱ͖͕ͨɺ લͷ'VODUPSʹґଘ͢ΔॲཧΛॻ͚ͳ͍ɻ def hogeOption(a: Int): Option[Int] = Some(a) hogeOption(1).flatMap(a => hogeOption(a).map(b => a+b)) // Some(2) for { a b } yield (a + b) // Some(2) .POBEલͷʹґଘ͢ΔॲཧΛఏڙ͢ΔܕΫϥε /POFqBU.BQ G qBU.BQ H /POFqBU.BQ BG B qBU.BQ H