Scala example source code file (TupleTest.scala)

This example Scala source code file (TupleTest.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

equal, int, monoid, order, semigroup

The TupleTest.scala Scala example source code

package scalaz
package std

import collection.immutable.IndexedSeq

import std.AllInstances._
import scalaz.scalacheck.ScalazProperties._
import scalaz.scalacheck.ScalazArbitrary._

object TupleTest extends SpecLite {

  type A = Int
  type B = Int
  type C = Int
  type D = Int
  type E = Int
  type F = Int
  type G = Int
  type H = Int
  type K = Int
  type V = Int
  type X = Int

  checkAll("Tuple1", order.laws[(A)])
  checkAll("Tuple2", order.laws[(A, B)])
  checkAll("Tuple3", order.laws[(A, B, C)])
  checkAll("Tuple4", order.laws[(A, B, C, D)])
  checkAll("Tuple5", order.laws[(A, B, C, D, E)])
  checkAll("Tuple6", order.laws[(A, B, C, D, E, F)])
  checkAll("Tuple7", order.laws[(A, B, C, D, E, F, G)])
  checkAll("Tuple8", order.laws[(A, B, C, D, E, F, G, H)])

  checkAll("Tuple1", monoid.laws[(A)])
  checkAll("Tuple2", monoid.laws[(A, B)])
  checkAll("Tuple3", monoid.laws[(A, B, C)])
  checkAll("Tuple4", monoid.laws[(A, B, C, D)])
  checkAll("Tuple5", monoid.laws[(A, B, C, D, E)])
  checkAll("Tuple6", monoid.laws[(A, B, C, D, E, F)])
  checkAll("Tuple7", monoid.laws[(A, B, C, D, E, F, G)])
  checkAll("Tuple8", monoid.laws[(A, B, C, D, E, F, G, H)])

  checkAll("Tuple2", bindRec.laws[(B, ?)])
  checkAll("Tuple3", bindRec.laws[(B, C, ?)])
  checkAll("Tuple4", bindRec.laws[(B, C, D, ?)])
  checkAll("Tuple5", bindRec.laws[(B, C, D, E, ?)])
  checkAll("Tuple6", bindRec.laws[(B, C, D, E, F, ?)])
  checkAll("Tuple7", bindRec.laws[(B, C, D, E, F, G, ?)])
  checkAll("Tuple8", bindRec.laws[(B, C, D, E, F, G, H, ?)])

  checkAll("Tuple1", monad.laws[Tuple1])
  checkAll("Tuple2", monad.laws[(B, ?)])
  checkAll("Tuple3", monad.laws[(B, C, ?)])
  checkAll("Tuple4", monad.laws[(B, C, D, ?)])
  checkAll("Tuple5", monad.laws[(B, C, D, E, ?)])
  checkAll("Tuple6", monad.laws[(B, C, D, E, F, ?)])
  checkAll("Tuple7", monad.laws[(B, C, D, E, F, G, ?)])
  checkAll("Tuple8", monad.laws[(B, C, D, E, F, G, H, ?)])

  checkAll("Tuple1", comonad.laws[Tuple1])
  checkAll("Tuple2", comonad.laws[(Int, ?)])

  checkAll("Tuple2", associative.laws[Tuple2])

  "syntax" should {
    import std.tuple.tupleSyntax._
    "mapElements" in {
       (1, 2).mapElements(_1 = 2 *) must_===((2, 2))
    }
    "toIndexedSeq" in {
      val as: IndexedSeq[Int] = (1, 2).toIndexedSeq
      as.toList must_===(List(1, 2))
    }
    "fold" in {
      (1, 2).fold(_ + _) must_===(3)
    }
  }

  object instances {
    object tuple1 {
      def show[A: Show] = Show[Tuple1[A]]
      def equal[A: Equal] = Equal[Tuple1[A]]
      def order[A: Order] = Order[Tuple1[A]]
      def semigroup[A: Semigroup] = Semigroup[Tuple1[A]]
      def monoid[A: Monoid] = Monoid[Tuple1[A]]

      def monad = Monad[Tuple1]
      def comonad = Comonad[Tuple1]
      def cozip = Cozip[Tuple1]

      // checking absence of ambiguity
      def equal[A: Order] = Equal[Tuple1[A]]
      def semigroup[A: Monoid] = Semigroup[Tuple1[A]]
    }
    object tuple2 {
      def show[A: Show, B: Show] = Show[(A, B)]
      def equal[A: Equal, B: Equal] = Equal[(A, B)]
      def order[A: Order, B: Order] = Order[(A, B)]
      def semigroup[A: Semigroup, B: Semigroup] = Semigroup[(A, B)]
      def monoid[A: Monoid, B: Monoid] = Monoid[(A, B)]

      def associative = Associative[Tuple2]
      def bitraverse = Bitraverse[Tuple2]
      def functor = Functor[(B, ?)]
      def bindRec[A: Semigroup] = BindRec[(A, ?)]
      def monad[A: Monoid] = Monad[(A, ?)]
      def cozip = Cozip[(A, ?)]

      // checking absence of ambiguity
      def equal[A: Order, B: Order] = Equal[(A, B)]
      def semigroup[A: Monoid, B: Monoid] = Semigroup[(A, B)]
      def functor[A: Monoid] = Functor[(A, ?)]
    }
    object tuple3 {
      def show[A: Show, B: Show, C: Show] = Show[(A, B, C)]
      def equal[A: Equal, B: Equal, C: Equal] = Equal[(A, B, C)]
      def order[A: Order, B: Order, C: Order] = Order[(A, B, C)]
      def semigroup[A: Semigroup, B: Semigroup, C: Semigroup] = Semigroup[(A, B, C)]
      def monoid[A: Monoid, B: Monoid, C: Monoid] = Monoid[(A, B, C)]
    }
  }
}