fun main() {
    val base = HashMap<String,String>()
    val update =  HashMap<String,String>()

    base["name"] = "Rocket Skates"
    base["price"] = "12.75"
    base["color"] = "yellow"

    update["price"] = "15.25"
    update["color"] = "red"
    update["year"] = "1974"

    val merged = HashMap(base)
    merged.putAll(update)

    println("base: $base")
    println("update: $update")
    println("merged: $merged")
}