FunctionalTest.scala

object FunctionalTest {
  def fold(args: Array[Int], lambda: (Int, Int) => Int) : Int = {
    var result = 0
    args.foreach((arg: Int) => result = lambda(result, arg))
    result
  }

  def fold2(lambda: (Int, Int) => Int) : (Array[Int]) => Int = {
    def folded(args: Array[Int]) : Int = {
      var result = 0
      args.foreach((arg: Int) => result = lambda(result, arg))
      result
    }
    folded
  }

  def main(args: Array[String]) {
    println(fold(Array(1, 2, 3), (sum, item) => sum + item))
    println(fold(Array(3, 4, 1), (max, item) => if(max > item) max else item))

    println(fold2((sum, item) => sum + item)(Array(1, 2, 3)))
    println(fold2((max, item) => if(max > item) max else item)(Array(3, 4, 1))) 
  }
}