uniqueHash.scala

/* http://tbje.blogspot.com/2010/04/random-unique-hash-in-scala.html */
import scala.util.Random

def uniqueRandomKey(chars: String, length: Int, uniqueFunc: String=>Boolean) : String = {
	val newKey = (1 to length).map(x => chars(Random.nextInt(chars.length))).mkString
	if (uniqueFunc(newKey)) newKey else uniqueRandomKey(chars, length, uniqueFunc)
} 		

val chars = ('a' to 'z') ++ ('A' to 'Z') ++ ('1' to '9')
val key = uniqueRandomKey(chars.toString, 22, (x:String)=>!keyExists?(x))