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@priort
Created December 30, 2018 11:07
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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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