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stephenLee/Case.scala

Created September 20, 2012 00:47
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Scala case class
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Case.scala
abstract class Expr
case class Var(name: String) extends Expr
case class Number(num: Double) extends Expr
case class UnOp(operator: String, arg: Expr) extends Expr
case class BinOp(operator: String, left: Expr, right: Expr) extends Expr
val v = Var("x")
val op = BinOp("+", Number(1), v)
v.name
op.left
op.right == Var("x")
op.copy(operator = "-")
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