For Tim

tims-recursion.scala

scala> def replace(what: String)(rules: List[(String,String)]): String = 
     |     rules.foldLeft(what)((seed,tuple) => 
     |       seed.replaceAll(tuple._1,tuple._2))
replace: (what: String)(rules: List[(String, String)])String

scala> replace("Little Bunny Foo foo")(List("Foo" -> "Pancake", "Bunny" -> "Rabbit"))
res3: String = Little Rabbit Pancake foo


scala>  def recurse(times: Int)(what: => String): String = {
     |     def rpt(times: Int, what: => String, aggregator: String): String = {
     |       println("Agg: " + aggregator)
     |       times match {
     |         case 0 => println("Done"); aggregator
     |         case _ => println("Recursing"); rpt(times - 1, what, aggregator + what)
     |       }
     |     }
     |     rpt(times, what, "")
     |   }
recurse: (times: Int)(what: => String)String

scala> resurce(5)("O HAI ")
<console>:8: error: not found: value resurce
       resurce(5)("O HAI ")
       ^

scala> recurse(5)("O HAI ")
Agg: 
Recursing
Agg: O HAI 
Recursing
Agg: O HAI O HAI 
Recursing
Agg: O HAI O HAI O HAI 
Recursing
Agg: O HAI O HAI O HAI O HAI 
Recursing
Agg: O HAI O HAI O HAI O HAI O HAI 
Done
res2: String = "O HAI O HAI O HAI O HAI O HAI "