parse query params memo

QueryParameter.scala

object QueryParameter{
  def parse(query: String):Map[String, List[String]] = {
    query
    .split("&")
    .map{_.split("=",2)}
      .collect{ case p if p.length == 2 => (p(0), p(1))}
        .foldLeft(Map.empty[String,List[String]])((z,n) => {
          z + ( (n._1, (n._2 :: z.getOrElse(n._1,List.empty[String]))) )
        })
  }
}