Accumulator by Scala

gistfile1.scala

object Accumulator {
  def accumulator(n: Int): Int => Int = {
    var i = n
    (x: Int) => { i += x; i }
  }

  def main(args: Array[String]) {
    val acc = accumulator(0)
    (1 to 5).foreach { i => println(acc(i * 2)) }
  }
}

// $ scalac Accumulator.scala
// $ scala Accumulator
// 2
// 6
// 12
// 20
// 30