Employee Monoid

EmployeeMonoid.scala

case class Employee(age:Int, tenure:Int, salary:Int, name:String)

def rnd(min:Int,max:Int) = math.round(min+math.random*(max-min)).toInt 

val empDB = for(employees<-1 to 10000) yield Employee( rnd(25,35),rnd(1,6),rnd(85000,150000),"emp"+employees)

case class Monoid(e:Set[Employee]) {     
  def plus(a:Employee,b:Employee)= {
  if(a.age > b.age) a else 
  if(b.age > a.age) b else 
  if(a.tenure > b.tenure) a else 
  if(b.tenure > a.tenure) b else 
  if (a.salary > b.salary) b else 
  if(b.salary > a.salary) a else 
  if( math.random > 0.5) a else b 
}
  val identity = Employee(0,0,0,"id")
  val theUnluckyOne = e.foldLeft(identity)((a,b)=>plus(a,b))
}

scala> empDB.sortBy(e=>(e.tenure,e.age,-e.salary)).reverse.head
res0: Employee = Employee(35,6,85079,emp7435)

scala> empDB.minBy(e=>(-e.tenure,-e.age,e.salary))
res1: Employee = Employee(35,6,85079,emp7435)

scala> Monoid(empDB.toSet).theUnluckyOne
res2: Employee = Employee(35,6,85079,emp7435)