Return: Quiz I in Go

Quiz: What would this code produce if we were to copy-paste it in a code editor and run it?

func getDouble(n int) int {
    n * 2
}

func mainFunction() {
    result := getDouble(10)
    fmt.Println(result)
}

Important Note:

Do not use an actual code editor to get the answer. It would defeat the purpose of the quiz.