Object/Trait

PartialFunction

Related Docs: trait PartialFunction | package scala

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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 }

Since: 2.8

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final def !=(arg0: Any): Boolean

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final def ##(): Int

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final def ==(arg0: Any): Boolean

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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
final def asInstanceOf[T0]: T0

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def clone(): AnyRef

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@throws( ... )
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.
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.
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.

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2.10
final def eq(arg0: AnyRef): Boolean

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def equals(arg0: Any): Boolean

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def finalize(): Unit

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def hashCode(): Int

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final def ne(arg0: AnyRef): Boolean

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final def notify(): Unit

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final def notifyAll(): Unit

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

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def toString(): String

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final def wait(): Unit

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