Functions with vararg parameter.md

Functions with vararg parameter

varargs are mapped to KotlinArray, not Swift's variardic parameters.

Explanations

Let's describe a function that uses vararg-arguments in Kotlin:

// FunctionWithVarargParameter.kt

fun funcWithVararg(vararg item: String) {
    println(item.joinToString { "$it | " })
}

In Swift code, this turns into a function that takes KotlinArray<NSString>.

let arr = KotlinArray<NSString>(
    size: 10,
    init: { index in "\(index)" as NSString }
)
FunctionWithVarargParameterKt.funcWithVararg(item: arr)

YouTrack has an issue about this problem, but variardic parameters in Objective-C are compile-time arguments, and Kotlin cannot simply take and convert vararg.

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