Currying at Kotlin Sample

Kurrying.kt

fun main(args: Array<String>) {
    
    // x + y
    val sum2Ints : (Int, Int) -> Int = { x, y -> x + y }
    val curriedSum2Ints = sum2Ints.curried()
    val applied1IntSum2Ints = curriedSum2Ints(5)
    println(applied1IntSum2Ints(8)) // 13
    
    // x + y + z
    val sum3Ints : (Int, Int, Int) -> Int = { x, y, z -> x + y + z }
    val curriedSum3Ints = sum3Ints.curried()
    val applied2IntsSum3Ints = curriedSum3Ints(1)(2)
    println(applied2IntsSum3Ints(3)) // 6
    println(applied2IntsSum3Ints(4)) // 7
}
// currying functions. 
// see https://github.com/MarioAriasC/funKTionale/blob/master/funktionale-currying/src/main/kotlin/org/funktionale/currying/namespace.kt
fun <P1, P2, R> ((P1, P2) -> R).curried() : (P1) -> (P2) -> R {
    return { p1: P1 -> { p2: P2 -> this(p1, p2) } }
}
fun <P1, P2, P3, R> ((P1, P2, P3) -> R).curried() : (P1) -> (P2) -> (P3) -> R {
    return { p1: P1 -> { p2: P2 -> { p3: P3 -> this(p1, p2, p3) } } }
}