KotlinKronicles-higherorder-map.kt

fun main (args: Array<String>) {
    val x = arrayListOf("A.B", "B.C", "C.D", "D.E", "E.F")
    println(x.map { stringStirrer(it) })
    // above line prints [Axx, Bxx, Cxx, Dxx, Exx]
}

fun stringStirrer(param: String): String {
    var changes = param.substringBefore(".")
    changes += "xx"
    return changes
}