| def createPianoTrio(pianoPlayerName:String, bassPlayerName:String, drummerName:String): Option[PianoTrio] = | |
| PianoPlayer(pianoPlayerName) | |
| .flatMap(validPianoPlayer => BassPlayer(bassPlayerName) | |
| .flatMap(validBassPlayer => Drummer(drummerName) | |
| .map( validDrummer => PianoTrio(validPianoPlayer, validBassPlayer, validDrummer)))) |
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