Hi. :slightly_smiling_face: I'm trying to find ou...

# arrow

[Tobias Hermann]

Hi. 🙂

I'm trying to find out, how to use arrow-kt to convert a function taking two parameters into a function taking a pair.

I wrote this goofy tuplize function:

fun foo(x: Int, y: Int) = 3 * x + 2 * y + 1

fun <T, U, R> tuplize(f: (T, U) -> R): ((Pair<T, U>) -> R) = { (a, b): Pair<T, U> -> f(a, b) }

val xs = listOf(Pair(1, 2), Pair(42, 23))

val ys = xs.map(tuplize(::foo))

It works, but I guess arrow-kt already has something nice build-in, and I just can't find it. Can somebody help me out?

[Alejandro Serrano Mena]

I think there’s nothing in Arrow currently. There are curry and uncurry function, but those change between (A, B) -> C and (A) -> (B) -> C

[Tobias Hermann]

Thanks. I seems like, in the past, there was something like that (or at least planned), called .tupled() (https://stackoverflow.com/a/57257548). I wonder why the idea did not survive.

[Alejandro Serrano Mena]

I think functions with Pair are less useful in Kotlin than in other languages because the language already has the notion of “having two arguments”