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Scala example source code file (IsomorphismUsage.scala)

This example Scala source code file (IsomorphismUsage.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.

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

app, isofunctortemplate, isomorphismmonad, isomorphismmonoid, isomorphismtraverse, isomorphismusage, isoset, list, seq

The IsomorphismUsage.scala Scala example source code

package scalaz.example

import scalaz._, Isomorphism._
import std.list._
import std.anyVal._
import syntax.monoid._
import syntax.monad._
import syntax.equal._
import syntax.traverse._

object IsomorphismUsage extends App {
  def isoSet[A] = new IsoSet[Seq[A], List[A]] {
    def to: Seq[A] => List[A] = _.toList
    def from: List[A] => Seq[A] = _.toSeq
  def isoFunctor = new IsoFunctorTemplate[Seq, List] {
    def to[A](sa: Seq[A]): List[A] = sa.toList
    def from[A](la: List[A]): Seq[A] = la.toSeq

  implicit def isoMonoid[A]: IsomorphismMonoid[Seq[A], List[A]] = new IsomorphismMonoid[Seq[A], List[A]] {
    def G = Monoid[List[A]]
    def iso = isoSet
  implicit val isoMonad: IsomorphismMonad[Seq, List] = new IsomorphismMonad[Seq, List] {
    def G = Monad[List]
    def iso = isoFunctor
  implicit val isoTraverse: IsomorphismTraverse[Seq, List] = new IsomorphismTraverse[Seq, List] {
    def G = Traverse[List]
    def iso = isoFunctor

  assert((Seq(1, 2) |+| Seq(3, 4)).toList === List(1, 2, 3, 4))
  assert {
    val seq = Seq(1, 2, 3) >>= {x => Seq(x, x+1)}
    val lst = List(1, 2, 3) >>= {x => List(x, x+1)}
    seq.toList === lst
  assert(List(Seq(1, 2), Seq(3, 4)).sequence.toList === List(List(1, 2), List(3, 4)).sequence)

Other Scala examples (source code examples)

Here is a short list of links related to this Scala IsomorphismUsage.scala source code file:

my book on functional programming


new blog posts


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