kevinmeredith

scala> sealed trait A { type T }
defined trait A

scala> case class AImpl(x: Int) extends A { override type T = Int }
defined class AImpl

scala> case class AImpl2(x: String) extends A { override type T = String }
defined class AImpl2

scala> def f(x: A)(implicit ev: x.T): x.T = ev

kevinmeredith

sealed trait Result
case class Good(status: Int) extends Result
case class Bad(error: Int) extends Result

// assume there's a `String => Int` function baked into `f`
// note - I don't like `String` as a return type, but it's not the purpose
//        of this exercise
def f(result: Result, handle: Result => String): String = ???

// assume there's a `String => Int` function baked into `f2`

kevinmeredith

[info] Running net.async.AsyncClientServer
[info] ROUTER: Received message from JILL.
[info] ROUTER: received empty:
[info] ROUTER: received message: READY
[info] DEALER: JILL received
[info] DEALER: JILL received WORLD
[info] DEALER: received ACK!
[info] ROUTER: Received message from JOE.
[info] ROUTER: received empty:

kevinmeredith

package net

import scala.util._
import shapeless._

object Test {

  case class Person(name: String, age: Double)
  case class PersonWrapper(person: Person, x: Int)

kevinmeredith

Smart Constructor

class Person private(name: String, age: Int)

object Person {
  def apply(name: String, age: Int): Option[Person] = 
    if (name.nonEmpty && age >= 0 && age < 115) Some( new Person(name, age) ) else None
}

kevinmeredith

After pasting Listing 19.4 (trait Queue):

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

trait Queue[T] {
def head: T
def tail: Queue[T]
def enqueue(x: T): Queue[T]

kevinmeredith

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

import play.api.libs.json._
import play.api.libs.functional.syntax._

case class Person private(age: Int)

object Person {
  def build(age: Int): Option[Person] = 

kevinmeredith

$cat build.sbt 
scalaVersion := "2.11.8"

libraryDependencies += "org.scalatest" % "scalatest_2.11" % "2.2.6"

# simply runs a test that does `assert(false)`
$sbt test
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512M; support was removed in 8.0
[info] Set current project to work (in build file:/Users/Kevin/Workspace/)

kevinmeredith

Terminal 1

$cat Dockerfile
FROM ubuntu

ADD ./test.sh /root/test.sh

ENTRYPOINT sh /root/test.sh

kevinmeredith

{
  "swagger": "2.0",
  "info": {
    "version": "v111",
    "title": "testing-april-26-kmm",
    "description": "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification",
    "termsOfService": "http://swagger.io/terms/",
    "contact": {
      "name": "Swagger API Team"
    },