scala

PartialFunction

object PartialFunction

A few handy operations which leverage the extra bit of information available in partial functions. Examples:

import PartialFunction._

def strangeConditional(other: Any): Boolean = cond(other) {
  case x: String if x == "abc" || x == "def"  => true
  case x: Int => true
}
def onlyInt(v: Any): Option[Int] = condOpt(v) { case x: Int => x }
Source
PartialFunction.scala
Since

2.8

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  1. final def !=(arg0: Any): Boolean

    Definition Classes
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  2. final def ##(): Int

    Definition Classes
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  3. final def ==(arg0: Any): Boolean

    Definition Classes
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  4. def apply[A, B](f: (A) ⇒ B): PartialFunction[A, B]

    Converts ordinary function to partial one

    Converts ordinary function to partial one

    Since

    2.10

  5. final def asInstanceOf[T0]: T0

    Definition Classes
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  6. def clone(): AnyRef

    Attributes
    protected[java.lang]
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    @throws( ... )
  7. def cond[T](x: T)(pf: PartialFunction[T, Boolean]): Boolean

    Creates a Boolean test based on a value and a partial function.

    Creates a Boolean test based on a value and a partial function. It behaves like a 'match' statement with an implied 'case _ => false' following the supplied cases.

    x

    the value to test

    pf

    the partial function

    returns

    true, iff x is in the domain of pf and pf(x) == true.

  8. def condOpt[T, U](x: T)(pf: PartialFunction[T, U]): Option[U]

    Transforms a PartialFunction[T, U] pf into Function1[T, Option[U]] f whose result is Some(x) if the argument is in pf's domain and None otherwise, and applies it to the value x.

    Transforms a PartialFunction[T, U] pf into Function1[T, Option[U]] f whose result is Some(x) if the argument is in pf's domain and None otherwise, and applies it to the value x. In effect, it is a match statement which wraps all case results in Some(_) and adds case _ => None to the end.

    x

    the value to test

    pf

    the PartialFunction[T, U]

    returns

    Some(pf(x)) if pf isDefinedAt x, None otherwise.

  9. def empty[A, B]: PartialFunction[A, B]

    The partial function with empty domain.

    The partial function with empty domain. Any attempt to invoke empty partial function leads to throwing scala.MatchError exception.

    Since

    2.10

  10. final def eq(arg0: AnyRef): Boolean

    Definition Classes
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  11. def equals(arg0: Any): Boolean

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  12. def finalize(): Unit

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    @throws( classOf[java.lang.Throwable] )
  13. final def getClass(): Class[_]

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  14. def hashCode(): Int

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  15. final def isInstanceOf[T0]: Boolean

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  16. final def ne(arg0: AnyRef): Boolean

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  17. final def notify(): Unit

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  18. final def notifyAll(): Unit

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  19. final def synchronized[T0](arg0: ⇒ T0): T0

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  20. def toString(): String

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  21. final def wait(): Unit

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  22. final def wait(arg0: Long, arg1: Int): Unit

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  23. final def wait(arg0: Long): Unit

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