slot-machine_engine_2016-12-23.js

var Game = function (return_function)
{
	this.play = function (bet, callback)
	{
		var return_amount = return_function(bet)

		if (callback !== undefined)
		{
			callback(return_sum);
		}

		return return_amount;
	}
}

function random_return(bet)
{
	var rand = Math.random();

	if (rand <= 0.50)
	{
		return 0;
	}
	else if (rand <= 0.75)
	{
		return bet / 2;
	}
	else if (rand <= 0.875)
	{
		return bet;
	}
	else if (rand <= 0.9375)
	{
		return bet * 2;
	}
	else if (rand <= 0.975)
	{
		return bet * 5;
	}
	else if (rand <= 0.96875)
	{
		return bet * 10;
	}
	else if (rand <= 1)
	{
		return bet * 25;
	}
}

var game = new Game(random_return);

function play_game()
{
	var credit = 2.00;

	for (var i = 0; i < 100; i++)
	{
		if (credit <= 0.10 && credit > 0)
		{
			credit = Math.round(Math.random()) ? 0 : 0.20
		}

		if (credit > 0)
		{
			var win = game.play(0.20);

			// console.log("Round " + (i+1) + ": " + credit + "€ - 0.20€ + " + win + "€ = " + (credit - 0.20 + win).toFixed(2) + "€");

			credit -= 0.20;
			credit += win;
			credit = credit.toFixed(2);
		}
		else
		{
			break;
		}
	}

	// console.log("Won: " + (credit - 2).toFixed(2) + "€");
	return (credit - 2).toFixed(2);
}

function test()
{
	var rounds = [];

	for (var i = 0; i < 100000; i++)
	{
		rounds.push(play_game());
	}

	var sum = 0;

	for (var win of rounds)
	{
		sum += Number(win);
	}

	average = sum / rounds.length;
	var return_percentage = sum / (2 * rounds.length);

	console.log("\nStatistics:");

	console.log("\nIncome: " + (2 * rounds.length) + "€");
	console.log("Expense: " + sum.toFixed(2) + "€");

	console.log("\nAverage win: " + average.toFixed(2) + "€");
	console.log("Return rate: " + (return_percentage * 100).toFixed(2) + "%");
}

test();