ReactorPlay.kt

    public override fun play(): List<Map.Entry<Int, List<String>>> {
        val scoreOfALetter = Function<Int, Flux<Int>> { letter -> Flux.just(letterScores[letter - 'a'.toInt()]) }

        val letterScore = Function<Map.Entry<Int, LongWrapper>, Flux<Int>> { entry ->
            Flux.just(
                letterScores[entry.key - 'a'.toInt()] * Integer.min(
                    entry.value.get().toInt(),
                    scrabbleAvailableLetters[entry.key - 'a'.toInt()]
                )
            )
        }