CODEWITHSUNDEEP
kotlinarrow-kt
Tobias Hermann
Tobias Hermann

Reputation: 10956

How 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 f = tuplize(::foo)

val ys = xs.map(f)

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

(Sure, I could just use val ys = xs.map { (a, b) -> foo(a, b) }, but in this example, the goal is to express it in point-free style.)

Upvotes: 2

Views: 323

Answers (1)

abendt
abendt

Reputation: 775

arrow used to have such utility functions in older versions (check https://github.com/arrow-kt/arrow-core/blob/master/arrow-syntax/src/main/kotlin/arrow/syntax/function/tupling.kt)

however they are deprecated and were removed

Upvotes: 1

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