Daniel Weller frehn
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| sealed trait Customer | |
| case class RegisteredCustomer(id : String) extends Customer | |
| case class EligibleRegisteredCustomer(id : String) extends Customer | |
| case class Guest(id: String) extends Customer | |
| def calculateTotal(customer: Customer)(spend: Double) = { | |
| val discount = customer match { | |
| case EligibleRegisteredCustomer(_) if spend >= 100.0 => spend * 0.1 | |
| case _ => 0.0 |