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#scala

Here is an example for a class hierarchy which consists of an abstract super class Term and three concrete case classes Var, Fun, and App.

abstract class Term
case class Var(name: String) extends Term
case class Fun(arg: String, body: Term) extends Term
case class App(f: Term, v: Term) extends Term

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Case Classes - Scala Documentation
Scala supports the notion of case classes. Case classes are regular classes which export their constructor parameters and which provide a recursive decomposition mechanism via pattern matching. <span>Here is an example for a class hierarchy which consists of an abstract super class Term and three concrete case classes Var, Fun, and App. abstract class Term case class Var(name: String) extends Term case class Fun(arg: String, body: Term) extends Term case class App(f: Term, v: Term) extends Term This class hierarchy can be used to represent terms of the untyped lambda calculus. To facilitate the construction of case class instances, Scala does not require that the new primitive


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