scala.PartialFunction
See thePartialFunction companion traitA 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 }
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.
the partial function
the value to test
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.
Apply the function to the given value if defined, and return the result in a Some; otherwise, return None.
the PartialFunction[T, U]
the value to test
Some(pf(x)) if pf isDefinedAt x, None otherwise.
The partial function with empty domain.
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.
an ordinary function
a partial function which delegates to the ordinary function f
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