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import scala.concurrent.duration._
import scala.concurrent.{Await, Future}
import scala.language.{higherKinds, postfixOps}
import scala.util.{Failure, Success}

object ContainerMapper {

  import scala.concurrent.ExecutionContext.Implicits.global

  //this is your typeclass signature. M[_] means M is a type 'constructor'. It needs another type (A) to become a type. List[_] vs List[A].

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object AmTest extends App {

  val x =         List("=",
                     "+",
                     "==",
                     "applyTo",
                     "asInstanceOf",
                     "attr",
                     "charAt",
                     "chars",

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List("one", "two", "three") map (_.length)

trait Functor[F[_]] {
 def fmap[A,B](f: A => B, fa:F[A]): F[B]
}

class ListFunctor extends Functor[List] {
  def fmap[A,B](f: A => B, fa:List[A]): List[B] = fa match {
    case Nil => Nil
    case x::xs => f(x) :: fmap(f, xs)

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case class Person(name:String)
fmap((_:Person).name, Holder(Person("Harry Potter")))
11: error: could not find implicit value for parameter functor: Functor[Holder]

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List -> is a type constructor
List[Long] -> is a type

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scala> val ar:List[Int] = Nil
ar: List[Int] = List()

scala> "blah" :: 5 :: 6 :: ar
res21: List[Any] = List(blah, 5, 6)

//how did I add a String to a List[Int]?
//how do you keep the type within the List fixed at Int?
//can I only do that at declaration time as opposed to when I call the :: method?
//This works:

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;; Load the ensime lisp code...
(add-to-list 'load-path "ENSIME_ROOT/elisp/")
(require 'ensime)

;; This step causes the ensime-mode to be started whenever
;; scala-mode is started for a buffer. You may have to customize this step
;; if you're not using the standard scala mode.
(add-hook 'scala-mode-hook 'ensime-scala-mode-hook)

;; MINI HOWTO: 

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Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

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sudo iptables -A CHAIN_NAME

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sudo chmod +x /etc/network/if-pre-up.d/iptablesload