PartialFunction

scala.PartialFunction

See thePartialFunction companion trait

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 }

Attributes

Companion: trait
Graph
Supertypes: class Object

trait Matchable

class Any
Self type: PartialFunction.type

Members list

Type members

Classlikes

Attributes

Supertypes: class AnyVal

trait Matchable

class Any
Self type: ElementWiseExtractor[A, B]^

Value members

Concrete methods

A Boolean test that is the result of the given function where defined, and false otherwise.

It behaves like a case _ => false were added to the partial function.

Value parameters

pf: the partial function
x: the value to test

Attributes

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

Apply the function to the given value if defined, and return the result in a Some; otherwise, return None.

Value parameters

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

Attributes

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

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

Attributes

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

Attributes

Returns: a partial function which delegates to the ordinary function f

In this article

Generated with