Teaching basic scala concepts

TeachScala.sc

/** Simple Base **/
abstract class Animal {
  def hasNose : Boolean
  def hasLegs : Boolean
  def numLegs : Int
}

/** Example Traits **/
trait Mammal {
  def isMammal : Unit = {
    println("Mammal Class \n")
  }

trait Tail {
  def hasTail : Unit = {
    println("Give me my tail \n")
  }

}

trait Reptile {
  def isReptile : Unit = {
    println("Direct descendant from dinosaurs \n")
  }
}

/** Example implementation **/
class Dog extends Animal with Tail{
  override def hasNose : Boolean = {
    true
  }

  override def hasLegs : Boolean = {
    true
  }

  override def numLegs : Int = {
    4
  }
}

val myDog = new Dog
myDog.hasLegs
myDog.hasNose
myDog.numLegs
myDog.hasTail

/** Scala Collections **/
val myList = List(1,2,3,4,5,6,7,8,9,10)

/** Higher order functions **/

def myAdd(x : Int) : Int = {
  x + 1
}

myList.map(x => myAdd(x))

/** Case Classes **/
trait Being

case class Person(name : String, Age : Int) extends Being
val p1 = Person("John", 32)
val p2 = Person("Maria", 28)

case class AlienFromMars(name : String, Age : Int) extends Being
val a1 = AlienFromMars("Joe", 1001)
val a2 = AlienFromMars("Kris", 3333)

case class UnknownBeing(name: String) extends Being
val u1 = UnknownBeing("What am I?")

/** Pattern Matching **/
def AlienOrPerson(livingBeing : Being) : Unit = livingBeing match {
  case Person("John", _) => println("This is John")
  case Person(_ , _ ) => println("This is a person")
  case AlienFromMars("Joe",_) => println ("This is Alien Joe from Mars")
  case AlienFromMars(_,_) => println("This is an Alien from Mars")
  case _ => println("This is an unknow being")
}

AlienOrPerson(p1)
AlienOrPerson(p2)
AlienOrPerson(a1)
AlienOrPerson(a2)
AlienOrPerson(u1)