(splay x) x: an iterable
Passes all of an iterator's items as function arguments.
During evaluation of a function call, the runtime checks whether any of the arguments are
(splay x) forms. If so, the form
x must evaluate to an
converted into an iterator; that iterator is repeatedly advanced until
it's finished; and all of the resulting items are passed as function
(let ar '(1 2 3 4)) (prn (+ ..ar 5)) ; prints 15 (prn (+ 1 2 3 4 5)) ; prints 15