their previous article was also great: https://jrsinclair.com/articles/2022/javascript-function-composition-whats-the-big-deal/#flow

amikor egy off-blockchain, ugy nevezett state-channel proof-of-concept-et csinaltam ethereumhoz, akkor en is ilyen stilusban irtam a frontend js codot: https://github.com/enumatech/sprites/blob/master/lib/channel-state.js#L193-L208