// Enables (2)-Tuples to apply themselves to a function
implicit class Tuple2Apply[T1,T2](t: (T1,T2)) {
  def apply[R](f: (T1,T2) => R) = f(t._1, t._2)
}

// a demo function
def perimeter(width: Int, height: Int) = 2*width + 2*height

// some demo tuples
val tuples = println((1 to 5).zipWithIndex

// ––– demo time –––

// .tupled requires function types to be known and
// makes it impossible to apply a function without
// "var =>" or partial function syntax

tuples.map(t => ((_:Int) + (_:Int)).tupled(t))

// Shorter, but still a little verbose
tuples.map(t => perimeter(t._1, t._2))

// Again, a lot shorter :)
tuples.map(_(perimeter))