jamie-allen

import akka.actor.Actor
import akka.actor.OneForOneStrategy
import akka.actor.SupervisorStrategy.Stop
import akka.actor.ActorSystem
import akka.actor.Props
import akka.actor.ActorInitializationException

class TestActorParent extends Actor {
  override val supervisorStrategy = OneForOneStrategy() {
    case a: ActorInitializationException => {

jamie-allen

/**
 * A simple Java data class with two immutable fields.  If I want
 * to add a third field (e.g. seconds), I have to update a ton of
 * places and remember them all, because a compiler will not tell
 * you what you missed.  If I generate equals/hashCode/toString, I
 * have to remember to do so with every change.  And I cannot 
 * overload constructors and assume default values for parameters,
 * because in this class, each field is an int and they'd have the
 * same signature, so I have to use the Builder Pattern to do 
 * default values.  This is a maintenance nightmare compared to

jamie-allen

scala> import cats._, cats.instances.all._
import cats._
import cats.instances.all._

scala> :paste
// Entering paste mode (ctrl-D to finish)

sealed trait TrafficLight
object TrafficLight {
  def red: TrafficLight = Red