The Strategy interface is first-class (=> Unit).

class Context(e: => Unit) { def exec = e }
val strategyA = new Context(println("strategyA"))
val strategyB = new Context(println("strategyB"))
def main(args: Array[String]) {
  strategyA.exec
  strategyB.exec
}
      

Wrap the value with new Context then later unwrap the value with exec ߞ for what gain?