Martingale casino wheel betting strategy simulator

martingale.js

// Simple (probably buggy) simualtor for the Martingale betting strategy on a casino wheel
// Slightly dodgy coding, bashed out quickly in 10 mins to prove a flatmate wrong...

const randomWin = () => {
	return Math.random() < 0.49;
}

let stats = {
	counter: 0,
	wins: 0,
	losses: 0,
	totalNetWorthChange: 0,
	gamesPlayed: 0
};
let startingBet = 0;
let startingAmount = 700;
let stopAmount = startingAmount + 1000;

let currentBet = startingBet;
let netWorth = startingAmount;

for (let i = 0; i < 1e6; i++) {
	while(true) {
		if (netWorth > stopAmount) {
			stats.wins++;
			break;
		}
		if (netWorth - currentBet < 0) {
			stats.losses++;
			break;
		}
		netWorth -= currentBet;
	
		if(randomWin()) {
			netWorth += currentBet*2;
			currentBet = 2;
		} else {
			currentBet *= 2;
		}

		if (netWorth < startingAmount) {
			stats.losses++;
			break;
		}
	
		stats.counter++;
	}
	stats.totalNetWorthChange += netWorth - startingAmount;
	stats.gamesPlayed++;

	// console.log(`Current stats after ${stats.counter} games:`);
	// console.log(`Net worth: £${netWorth}`);
	// console.log(`Change in net worth: £${netWorth - startingAmount}`);
	// console.log(``);
	
	stats.counter = 0;
	netWorth = startingAmount;
	currentBet = startingBet;
}

console.log(``);
console.log(`###########################################`);
console.log(`Total stats`);
console.log(`Wins: ${stats.wins}`);
console.log(`Losses: ${stats.losses}`);
console.log(`Sum change in net worth: £${stats.totalNetWorthChange}`);
console.log(`Average change in net worth: £${(stats.totalNetWorthChange/stats.gamesPlayed).toFixed(2)}`);
console.log(``);