alaz

/**
 * In reply to http://blog.xebia.com/2009/07/04/real-world-functional-programming-in-scala-comparing-java-clojure-and-scala/
 */

def opt[T](x: Seq[T]): Seq[T] = if (x == null) Nil else x

def indexed[T](coll: Seq[T]): Seq[(Int, T)] = {
  val c = opt(coll)
  List.range(0,c.length).zip(c.toList)
}

alaz

/*
 * IfLoggedIn implementation which redirects to the page a user was going to,
 * after his/her successful login
 *
 * based on http://groups.google.com/group/liftweb/browse_thread/thread/bdd5accd4bb623c9/d56e054c4037470f ,
 * works with ProtoUser out of the box
 */

// In SiteMap:
lazy val IfLoggedIn = If(User.loggedIn_? _, loginAndComeBack _)