09/21/2010 23:18:13
Scala | collatz
def collatz(n: Int) = n match {
case n if n % 2 == 0 => n / 2
case n => (3 * n) + 1
}
def nestWhileList[A](f: A => A, initial: A, p: A => Boolean) = {
val result = Stream.iterate(initial)(f).takeWhile(p).toList
result :+ f(result.last)
}
val cs = nestWhileList(collatz(_: Int), 200, (_: Int) != 1)--------------------------------------------------------------------------------
