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 }

Companion:: class
Source:: PartialFunction.scala

class Object

trait Matchable

class Any

PartialFunction.type

Type members

Classlikes

Source:: PartialFunction.scala

Value members

Concrete methods

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.

Value parameters:

pf: the partial function
x: the value to test

Returns:

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

Source:

PartialFunction.scala

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.

Value parameters:

pf: the PartialFunction[T, U]
x: the value to test

Returns:

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

Source:

PartialFunction.scala

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.

Source:: PartialFunction.scala

Converts an ordinary function to a partial function.

Converts an ordinary function to a partial function. Note that calling isDefinedAt(x) on this partial function will return true for every x.

Value parameters:

f: an ordinary function

Returns:

a partial function which delegates to the ordinary function f

Source:

PartialFunction.scala