mpilquist

class Age private (val v: Short) extends AnyVal {
  def isInfant = v < 2
  def isToddler = v >= 2 && v <= 4
  def isSenior = v >= 50
}

object Age {
  def apply(v: Short): Age = {
    require(v >= 0 && v < 200, "Must be between 0 and 200")
    new Age(v)

mpilquist

import shapeless._

trait F[A] {
  def xmap[B](f: A => B, g: B => A): F[B]
  def as[B] = new AsAux[B]
  class AsAux[B] {
    def apply[C](implicit gen: Generic.Aux[B, C], ev: A =:= C): F[B] =
      xmap(a => gen.from(ev(a)), b => gen.to(b).asInstanceOf[A])
  }
}

mpilquist

sealed trait Interact[A]

case class Ask(prompt: String)
  extends Interact[String]

case class Tell(msg: String)
  extends Interact[Unit]

trait Monad[M[_]] {
  def pure[A](a: A): M[A]

mpilquist

  object CaseClassToMapStringOfString {
    import shapeless._
    import shapeless.labelled._
    import syntax.singleton._
    import record._
    import ops.record._
    import syntax.singleton._
 
    case class Color(value: String)
    case class ChartOptions(stringOpt: String, intOpt: Int, colorOpt: Color)

mpilquist

/*
 * Copyright 2020 Daniel Spiewak
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software