fun awesomeFun(text: String): Int? {
        print("$text is awesome.")
        return 1 // result of calculation
    }

    fun uglyFun(text: String): Int? {
        print("$text is ugly!")
        return null // result of calculation
    }

    fun getOrPut(x: String, handler: (key: String) -> Int?) {
        val result = handler(x)
        print( "We received ${result ?: -1} responses.")
    }

    fun someCalculation() {
        var isAwesome = true
        getOrPut("Hey", if (isAwesome) ::awesomeFun else ::uglyFun )
    }