Scala: Functional

Functional

object Functional {

  def printItemsImperative(items: Array[String]): Unit = {
    var i = 0

    while (i < items.length) {
      println(items(i))
      i += 1
    }
  }

  def printItemsFunctional(items: Array[String]): Unit = {
    for (item <- items)
      println(item)
  }

  def printItemsFunctionalShort(items: Array[String]): Unit = {
    items.foreach(println)
  }

  def printItemsPureFunctional(items: Array[String]) = {
    items.mkString("\n")
  }

  val items = Array("one", "two", "three")
  printItemsImperative(items)
  printItemsFunctional(items)
  printItemsFunctionalShort(items)
  println(printItemsPureFunctional(items))

  // makes the pure functional method easy to test:
  assert(printItemsPureFunctional(items) == "one\ntwo\nthree")

  val lines = Array("This is a line", "and this is another line", "so's this!")

  val longestLine = lines.reduceLeft((a, b) => if (a.length > b.length) a else b)
}