How Does One Make Scala Control Abstraction in Repeat Until?

Question

I am Peter Pilgrim. I watched Martin Odersky create a control abstraction in Scala. However I can not yet seem to repeat it inside IntelliJ IDEA 9. Is it the IDE?

Answer 1

As above yet recursive :)

def repeat(b: => Unit) = new {def until(c: => Boolean) = { b; if (c) until(c) }}

var i = 0
repeat {
  println(i)
  i+=1
} until (i < 10)

It's @tailrec optimized too.

Llove scala :)