//Using a closure:
func apply(fun, fst) { snd => fun(fst, snd) }

//Usage:
func sum(x, y) { x + y }

var sum2 = apply(sum, 2)
var x = sum2(3) //x is 5

//By second argument
func flip(fun) { (y, x) => fun(x, y) }
func sub(x, y) { x - y }

var sub3 = apply(flip(sub), 3)
x = sub3(9) //x is 6