Function

object Function

A module defining utility methods for higher-order functional programming.

class Object
trait Matchable
class Any

Value members

Concrete methods

def chain[T](fs: Seq[T => T]): T => T

Given a sequence of functions f1, ..., fn, return the function f1 andThen ... andThen fn.

Value Params
fs

The given sequence of functions

Source
Function.scala
def const[T, U](x: T)(y: U): T

The constant function

def tupled[T1, T2, R](f: (T1, T2) => R): (T1, T2) => R

Tupling for functions of arity 2. This transforms a function of arity 2 into a unary function that takes a pair of arguments.

Note

These functions are slotted for deprecation, but it is on hold pending superior type inference for tupling anonymous functions.

Source
Function.scala
def tupled[T1, T2, T3, R](f: (T1, T2, T3) => R): (T1, T2, T3) => R

Tupling for functions of arity 3. This transforms a function of arity 3 into a unary function that takes a triple of arguments.

def tupled[T1, T2, T3, T4, R](f: (T1, T2, T3, T4) => R): (T1, T2, T3, T4) => R

Tupling for functions of arity 4. This transforms a function of arity 4 into a unary function that takes a 4-tuple of arguments.

def tupled[T1, T2, T3, T4, T5, R](f: (T1, T2, T3, T4, T5) => R): (T1, T2, T3, T4, T5) => R

Tupling for functions of arity 5. This transforms a function of arity 5 into a unary function that takes a 5-tuple of arguments.

def uncurried[T1, T2, R](f: T1 => T2 => R): (T1, T2) => R

Uncurrying for functions of arity 2. This transforms a unary function returning another unary function into a function of arity 2.

def uncurried[T1, T2, T3, R](f: T1 => T2 => T3 => R): (T1, T2, T3) => R

Uncurrying for functions of arity 3.

def uncurried[T1, T2, T3, T4, R](f: T1 => T2 => T3 => T4 => R): (T1, T2, T3, T4) => R

Uncurrying for functions of arity 4.

def uncurried[T1, T2, T3, T4, T5, R](f: T1 => T2 => T3 => T4 => T5 => R): (T1, T2, T3, T4, T5) => R

Uncurrying for functions of arity 5.

def unlift[T, R](f: T => Option[R]): PartialFunction[T, R]

Turns a function A => Option[B] into a PartialFunction[A, B].

Important note: this transformation implies the original function may be called 2 or more times on each logical invocation, because the only way to supply an implementation of isDefinedAt is to call the function and examine the return value. See also scala.PartialFunction, method applyOrElse.

Value Params
f

a function T => Option[R]

Returns

a partial function defined for those inputs where f returns Some(_) and undefined where f returns None.

See also

scala.PartialFunction, method lift.

Source
Function.scala
def untupled[T1, T2, R](f: (T1, T2) => R): (T1, T2) => R

Un-tupling for functions of arity 2. This transforms a function taking a pair of arguments into a binary function which takes each argument separately.

def untupled[T1, T2, T3, R](f: (T1, T2, T3) => R): (T1, T2, T3) => R

Un-tupling for functions of arity 3. This transforms a function taking a triple of arguments into a ternary function which takes each argument separately.

def untupled[T1, T2, T3, T4, R](f: (T1, T2, T3, T4) => R): (T1, T2, T3, T4) => R

Un-tupling for functions of arity 4. This transforms a function taking a 4-tuple of arguments into a function of arity 4 which takes each argument separately.

def untupled[T1, T2, T3, T4, T5, R](f: (T1, T2, T3, T4, T5) => R): (T1, T2, T3, T4, T5) => R

Un-tupling for functions of arity 5. This transforms a function taking a 5-tuple of arguments into a function of arity 5 which takes each argument separately.