in scala
trait PartialFunction

`abstract trait` PartialFunction [A, B]
  `extends` java.lang.Object
  `with` scala.Function1[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:
  BoxedArray, MutableList, Map, Seq, RecursiveProxyHandler

Def Summary
| `def` andThen [C] (k: scala.Function1[B, C]) : java.lang.Object with 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, B <: B1] (that: scala.PartialFunction[A1, B1]) : java.lang.Object with scala.PartialFunction[A1,B1]

Def Detail

`def` andThen [C](k: scala.Function1[B, C]): java.lang.Object with 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, B <: B1](that: scala.PartialFunction[A1, B1]): java.lang.Object with scala.PartialFunction[A1,B1]