State of Curry and Partial application in Swift.swift

// Current state of curry and partial application in Swift
// go 
func adder1(a:Int)(b:Int) -> Int {
    return a + b
}

let adder2 = {(a: Int, b: Int) -> Int in
    return a + b;
}

let adder3 = {(a: Int) -> (Int -> Int) in
    return {(b: Int) -> Int in
        return a + b;
    };
}

adder1(5)(b:10)

adder2(5, 10)

adder3(5)(10)