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javaandroidkotlinkotlin-interop

Compile time error in passing vararg parameter to another function in Kotlin

I'm trying to accept a vararg parameter as a function parameter in Kotlin and trying to pass it to another function with vararg parameters. However, it gives me a compile time error in doing so, type mismatch: inferred type is IntArray but Int was expected.

Kotlin:

fun a(vararg a: Int){
   b(a) // type mismatch inferred type is IntArray but Int was expected
}

fun b(vararg b: Int){

}

However, if I try the same code in Java, it works.

Java:

void a(int... a) {
    b(a); // works completely fine
}

void b(int... b) {

}

How can I get around this?

Solution

  • Just put a * in front of your passed argument (spread operator), i.e.

    fun a(vararg a: Int){
  // a actually now is of type IntArray
  b(*a) // this will ensure that it can be passed to a vararg method again
}

    See also: Kotlin functions reference #varargs