Scala example source code file (Function2Ops.scala)

This example Scala source code file (Function2Ops.scala) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Scala by Example" ^TM.

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Java - Scala tags/keywords

anyval, applicative, function2ops, tofunction2ops

The Function2Ops.scala Scala example source code

package scalaz
package syntax
package std

final class Function2Ops[T1, T2, R](val self: (T1, T2) => R) extends AnyVal {
  def flip: (T2, T1) => R = (v2: T2, v1: T1) => self(v1, v2)

  def on[X](f: (R, R) => X, t1: (T1, T1), t2: (T2, T2)): X = f(self(t1._1, t2._1), self(t1._2, t2._2))

  def contramap[TT](f: TT => T1)(implicit ev: T1 =:= T2): (TT, TT) => R = (t1, t2) => self(f(t1), ev(f(t2)))

  def lift[F[_]](implicit F: Applicative[F]): (F[T1], F[T2]) => F[R] = F.lift2(self)

  def byName: (=> T1, => T2) => R = (t1, t2) => self(t1, t2)
}

trait ToFunction2Ops {
  implicit def ToFunction2Ops[T1, T2, R](f: (T1, T2) => R) = new Function2Ops(f)
}