self.f = method(x, y[ ], z){
   x.print()
   for(i = 0, i < y.size(), i = i + 1){
      ('[' + y[i] + ']').print()
   }
   z.print()
}

self.f(1, 2, 3)
'---'.print()
self.f(1, 2, 3, 4)
'---'.print()
self.f(1, 2)