gistfile1.scala

//Avec pattern matching
get("/track/:id") { request =>
    val result = request.routeParams.getOrElse("id") match {
       case None => Map("track2" -> "larzac", "track1" -> "salagou")
       case Some(id) => Map("track1" -> "salagou")
    }
    
    render.json(result)
}

//Sans pattern matching
render.json(o.map(id => Map("track1" -> "salagou")).getOrElse(Map("track2" -> "larzac", "track1" -> "salagou")))