if (myList.isEmpty) return x > 5
if x < 0 return false
if (myList.head == "+") return foo()
if (myList.head == "-") return bar()

if(x > 0) {
  myList.headOption match {
    case Some("+") => foo()
    case Some("-") => bar()
    case None => x > 5
} else false

myList match {
  case Nil => x > 5
  case _ if x < 0 => false
  case "+" :: _ => foo()
  case "-" :: _ => bar()
}

def sampleFunction: Boolean =
  lst match {
    case Nil            => x > 5
    case _ if (x < 0)   => false
    case "+" :: _       => true
    case "-" :: _       => false
    case _              => true // return something if nothing matches
  }