Curried anonymous function in SML

Question

I have the function below and it works:

(fn x => x * 2) 2; 

but this one doesn\'t work:

(fn x y => x + y ) 2 3;
         


        

Answer 1

In Standard ML, a function can have only one argument, so use

(fn (x,y) => x + y) (2,3) 

and the type is

fn: int * int -> int

in this time (x,y) and (2,3) is a list structure,