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Showing content from https://www.scala-lang.org/api/current/scala/Function1.html below:

Function1

scala.Function1

A function of 1 parameter.

In the following example, the definition of succ is shorthand, conceptually, for the anonymous class definition anonfun1, although the implementation details of how the function value is constructed may differ:

object Main extends App {
  val succ = (x: Int) => x + 1
  val anonfun1 = new Function1[Int, Int] {
    def apply(x: Int): Int = x + 1
  }
  assert(succ(0) == anonfun1(0))
}

Note that the difference between Function1 and scala.PartialFunction is that the latter can specify inputs which it will not handle.

Companion

object

Source

Function1.scala

Graph

Supertypes

Known subtypes

trait

MapOps

[

K

,

V

,

CC

,

C

]

trait

MapOps

[

K

,

V

,

CC

,

C

]

trait

MapOps

[

K

,

V

,

CC

,

C

]

Show all

Self type

Apply the body of this function to the argument.

Apply the body of this function to the argument.

Returns

the result of function application.

Source

Function1.scala

Composes two instances of Function1 in a new Function1, with this function applied first.

Composes two instances of Function1 in a new Function1, with this function applied first.

A

the result type of function g

g

a function R => A

Returns

a new function f such that f(x) == g(apply(x))

Source

Function1.scala

Composes two instances of Function1 in a new Function1, with this function applied last.

Composes two instances of Function1 in a new Function1, with this function applied last.

A

the type to which function g can be applied

g

a function A => T1

Returns

a new function f such that f(x) == apply(g(x))

Source

Function1.scala

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Returns

a string representation of the object.

Definition Classes

Source

Function1.scala

Converts an optional function to a partial function.

Converts an optional function to a partial function.

Example

Unlike Function.unlift, this UnliftOps.unlift method can be used in extractors.

val of: Int => Option[String] = { i =>
  if (i == 2) {
    Some("matched by an optional function")
  } else {
    None
  }
}
util.Random.nextInt(4) match {
  case of.unlift(m) => // Convert an optional function to a pattern
    println(m)
  case _ =>
    println("Not matched")
}

Source

Function1.scala

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