Asynchronous game of "guess a number" (Concurrent programming in the Chemical Machine)

This tutorial illustrates Chemical Machine programming using the example of "asynchronous guess-a-number game". In this game, the player can ask questions and the machine will answer all questions asynchronously, out-of-order. However, the machine should not print any answers while the player is typing a next question.

I show how to determine the data that needs to be carried by molecules, and to come up with the code for the reactions. I explain how the chemical machine models contention and asynchronous requests. Contention is modeled straightforwardly by introducing an extra molecule that serves as a "contention token". In this way, contention is modeled separately from data.

Sample code in this tutorial:
https://github.com/Chymyst/Chymyst/blob/master/src/test/scala/io/chymyst/lab/ChymystGuessGame.scala

Main repository for the `Chymyst` library: https://github.com/Chymyst/chymyst-core/