Channing Walton channingwalton
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channingwalton
/ MonadTransformerExamples.scala
Last active
December 20, 2015 21:29
— forked from krasserm/MonadTransformerExamples.scala
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| // ------------------------------------------------------ | |
| // Combined List/Option/Either | |
| // ------------------------------------------------------ | |
| object MonadTransformers extends App { | |
| import scalaz._, Scalaz._ | |
| import EitherT._ | |
| type OptionTList[α] = ({ type λ[α] = OptionT[List, α] })#λ[α] | |
| val c1: EitherT[OptionTList, String, String] = eitherT[OptionTList, String, String](OptionT[List, \/[String, String]](List(some(\/-("c1a")), some(\/-("c1b"))))) |
channingwalton
/ monadwriterexample.scala
Last active
December 14, 2015 04:09
— forked from YoEight/monadwriterexample.scala
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| object MonadWriterExample extends App { | |
| import scalaz._ | |
| import Scalaz._ | |
| implicit val monadWriter = EitherT.listenableMonadWriter[Writer, String, String] | |
| case class Person(firstName: String, age: Int, car: Option[String]) | |
| def notEmpty(s: String) = Option(s).filter(x ⇒ !x.isEmpty && !x.forall(_.isWhitespace)) match { | |
| case Some(r) ⇒ monadWriter.right[String](r) |