marc0der

object Main extends App {
  RatpackServer.start { spec =>
    spec.serverConfig(c => c.env())
      .registry(Guice.registry(g => g.bind(classOf[VersionHandler])))
      .handlers(chain => chain.get("version", classOf[VersionHandler]))
  }
}

case class VersionConfig(@BeanProperty appName: String, @BeanProperty appVersion: String)

marc0der

================================================================================
Available Java Versions
================================================================================
Vendor         | Current | Version       | Status           | Identifier
--------------------------------------------------------------------------------
AdoptOpenJDK   |         | 12.0.1.j9     | available        | 12.0.1.j9-adpt
               |   >>>   | 12.0.1.hs     | available        | 12.0.1.hs-adpt
               |         | 11.0.3.j9     | installed        | 11.0.3.j9-adpt
               |         | 11.0.3.hs     | available        | 11.0.3.hs-adpt
               |         | 8.0.212       | available        | 8.0.212-adpt

marc0der

class ForST private constructor() {
    companion object
}

typealias STOf<S, A> = arrow.Kind2<ForST, S, A>

typealias STPartialOf<S> = arrow.Kind<ForST, S>

@Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE")
inline fun <S, A> STOf<S, A>.fix(): ST<S, A> = this as ST<S, A>

marc0der

Functional error handling in Kotlin

Agenda:

• About the (simple) exercise
• Higher Order Functions
• Throwing exceptions: here be dragons!!
• Sentinel values: better but not great
• The Option: error as an ADT
• Functional combinators: add some sugar