Packages

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
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Type Members

  1. final class ElementWiseExtractor[-A, +B] extends AnyVal

Value Members

  1. def cond[A](x: A)(pf: PartialFunction[A, Boolean]): Boolean

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

    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.

    x

    the value to test

    pf

    the partial function

    returns

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

  2. def condOpt[A, B](x: A)(pf: PartialFunction[A, B]): Option[B]

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

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

    x

    the value to test

    pf

    the PartialFunction[T, U]

    returns

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

  3. 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.

  4. def fromFunction[A, B](f: (A) => B): PartialFunction[A, B]

    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.

    f

    an ordinary function

    returns

    a partial function which delegates to the ordinary function f