| def createPianoTrio(pianoPlayerName:String, bassPlayerName:String, drummerName:String): Option[PianoTrio] = | |
| for { | |
| pp <- PianoPlayer(pianoPlayerName) | |
| bp <- BassPlayer(bassPlayerName) | |
| d <- Drummer(drummerName) | |
| } yield PianoTrio(pp, bp, d) |
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