14. Varargs

A vararg parameter accepts any number of arguments. Inside the function it behaves like an array.

fun sum(vararg numbers: Int): Int {
    var total = 0
    for (n in numbers) total += n
    return total
}

fun main() {
    // pass several arguments directly
    println(sum(1, 2, 3))
    println(sum(10, 20, 30, 40))

    // spread an existing array into the vararg with *
    val arr = intArrayOf(5, 5, 5)
    println(sum(*arr))
}

Running it:

$ kotlin run
6
100
15

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