pointfree.hs

f1 x y = x - y
f2 x y = (-) x y
f3 x   = (-) x
f4     = (-)

g1 x = f4 2 x
g2   = f4 2

main = do
    print $ g2 5

pointfree_add.scala

val add: Int => Int => Int = x => y => x + y
println(add(1)(2))
def add1(x: Int): Int = add(1)(x)
println(add1(1))
def add2 = add(1)
println(add2(4))

pointfree_sub.scala

def f1(x: Int, y: Int): Int = x - y
def f2(x: Int): Int = f1(3, x)
def f3 = f1(3, _:Int)
def f4 = f1(_:Int, _:Int)

println(f1(3, 2))
println(f2(2))
println(f3(2))
println(f4(3, 2))

def g1(x: Int): Int = f4(2, x)
def g2 = f4(2, _:Int)

println(g1(5))
println(g2(5))