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vvviiimmm/fm0.scala

Last active February 7, 2019 10:51
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fm0.scala
sealed trait UserInteraction[A]
// An effect that takes a String and retuns Unit vvvv
case class Tell(statement: String) extends UserInteraction[Unit]
// An effect that takes a String and retuns a String vvvvvv
case class Ask(question: String) extends UserInteraction[String]
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