Playing Oliver Darkshire’s “Potato” a million times

potato.js

// Game rules: https://twitter.com/deathbybadger/status/1567425842526945280
const resultCounter = {
	whisked: 0,
	burrowed: 0,
	eaten: 0,
};

const gameState = {};

const roll = () => Math.floor(Math.random() * 6);

const gardenTree = [
	() => ++gameState.potatoes,
	() => {
		++gameState.potatoes;
		++gameState.destiny;
	},
	() => {
		++gameState.destiny;
		++gameState.orcs;
	},
	() => {
		++gameState.orcs;
		gameState.potatoes = Math.max(0, gameState.potatoes - 1);
	},
	() => (gameState.potatoes = Math.max(0, gameState.potatoes - 1)),
	() => (gameState.potatoes += 2),
];

const knockTree = [
	() => ++gameState.orcs,
	() => ++gameState.destiny,
	() => {
		++gameState.orcs;
		++gameState.destiny;
	},
	() => {
		gameState.potatoes = Math.max(0, gameState.potatoes - 1);
		gameState.orcs += 2;
	},
	() => ++gameState.destiny,
	() => (gameState.potatoes += 2),
];

function addDanger() {
	++gameState.danger;
}
const startTree = [gardenTree, gardenTree, knockTree, knockTree, addDanger, addDanger];

function check() {
	if (gameState.orcs >= 10) {
		// At the last minute, hurl in the back garden!
		while (gameState.potatoes >= gameState.danger && gameState.orcs >= 10) {
			gameState.potatoes -= gameState.danger;
			--gameState.orcs;
		}

		if (gameState.orcs >= 10) {
			++resultCounter.eaten;
		} else {
			currentTree = startTree;
			return false;
		}
	} else if (gameState.destiny >= 10) {
		++resultCounter.whisked;
	} else if (gameState.potatoes >= 10) {
		++resultCounter.burrowed;
	} else {
		currentTree = startTree;
		return false;
	}
	return true;
}

function resetGame() {
	currentTree = startTree;
	gameState.orcs = 0;
	gameState.potatoes = 0;
	gameState.destiny = 0;
	gameState.danger = 1;
}

function playGame() {
	resetGame();
	while (true) {
		const roll = Math.floor(Math.random() * 6);
		const next = currentTree[roll];
		if (typeof next === 'function') {
			next();
			if (check()) return;
		} else {
			currentTree = next;
		}
	}
}

for (let i = 0; i < 1000000; ++i) playGame();

console.log(resultCounter);

results.json

{
  "burrowed": 222276,
  "eaten": 554215,
  "whisked": 223509,
}