in scala
trait PartialFunction

abstract trait PartialFunction [-A, +B]
extends java.lang.Object
with (A) => B
with scala.ScalaObject
A partial function of type PartialFunction[A, B] is a unary function where the domain does not include all values of type A. The function isDefinedAt allows to test dynamically, if a value is in the domain of the function.
Author:
Martin Odersky
Version:
1.0, 16/07/2003
Direct Known Subclasses:
MutableList, Map, Seq, RecursiveProxyHandler

Def Summary
override def andThen [C] (k: (B) => C) : scala.PartialFunction[A,C]

abstract def isDefinedAt (x: A) : scala.Boolean
Checks if a value is contained in the functions domain.
def orElse [A1 <: A, B1 >: B] (that: scala.PartialFunction[A1, B1]) : scala.PartialFunction[A1,B1]

Def inherited from (A) => B
andThen , apply, compose, toString
Def Detail
override def andThen [C](k: (B) => C): scala.PartialFunction[A,C]

abstract def isDefinedAt (x: A): scala.Boolean
Checks if a value is contained in the functions domain.
Parameters:
x - the value to test
Returns:
true, iff x is in the domain of this function.

def orElse [A1 <: A, B1 >: B](that: scala.PartialFunction[A1, B1]): scala.PartialFunction[A1,B1]