Issues doing simulations

for (let i = 0; i <= 100000000; i++){
	totalEarnings += playHand(deck);
}
console.log(totalEarnings/100000000);

function playHand(originalShoe) {
	
	var freeBet = 0;
	var winnings;
	var shoe = originalShoe.slice(0);
	const handOne = [15,16], handTwo = [15,16], handThree = [15,16], handFour = [15,16];
	
	shoe = shuffle(shoe);
	handOne[0] = shoe.pop();
	handOne[1] = shoe.pop();
	
	//Code block that handles splits
	if (handOne[0] != 10 && handOne[0] != 11 && handOne[0] != 12 && handOne[0] != 13)
	{
	
		if (handOne[0] == handOne[1]) // First split
		{
			freeBet++;
			handTwo[0] = handOne[0];
			handOne[1] = shoe.pop();
			handTwo[1] = shoe.pop();
		}

		if (handOne[0] == handOne[1]) // second split
		{
			freeBet++;
			handThree[0] = handOne[0];
			handOne[1] = shoe.pop();
			handThree[1] = shoe.pop();
		} else if (handTwo[0] == handTwo[1]) {
			freeBet++;
			handThree[0] = handTwo[0];
			handTwo[1] = shoe.pop();
			handThree[1] = shoe.pop();
		}

		if (handOne[0] == handOne[1]) // final split
		{
			freeBet++;
			handFour[0] = handOne[0];
			handOne[1] = shoe.pop();
			handFour[1] = shoe.pop();
		} else if (handTwo[0] == handTwo[1]) {
			freeBet++;
			handFour[0] = handTwo[0];
			handTwo[1] = shoe.pop();
			handFour[1] = shoe.pop();
		} else if (handThree[0] == handThree[1]) {
			freeBet++;
			handFour[0] = handThree[0];
			handThree[1] = shoe.pop();
			handFour[1] = shoe.pop();
		}
		
	}
	
	
	//Check for free doubles
	if (handOne[0] + handOne[1] == 9 || handOne[0] + handOne[1] == 10 || handOne[0] + handOne[1] == 11)
	{
		freeBet++;
	}
	
	if (handTwo[0] + handTwo[1] == 9 || handTwo[0] + handTwo[1] == 10 || handTwo[0] + handTwo[1] == 11)
	{
		freeBet++;
	}
	
	if (handThree[0] + handThree[1] == 9 || handThree[0] + handThree[1] == 10 || handThree[0] + handThree[1] == 11)
	{
		freeBet++;
	}
	
	if (handFour[0] + handFour[1] == 9 || handFour[0] + handFour[1] == 10 || handFour[0] + handFour[1] == 11)
	{
		freeBet++;
	}
	
	switch (freeBet) {
		case 0:
			winnings = -1;
			break;
		case 1:
			winnings = 3;
			break;
		case 2:
			winnings = 12;
			break;
		case 3:
			winnings = 30;
			break;
		case 4:
			winnings = 50;
			break;
		case 5:
			winnings = 100;
			break;
		case 6:
			winnings = 100;
			break;
		case 7:
			winnings = 100;
			break;
		default:
			console.log("Error: too many free bets");
		break;
	}
	
		/* Debug logs
		console.log("hand one " + handOne)
		console.log("hand two " + handTwo)
		console.log("hand three " + handThree)
		console.log("hand four " + handFour)
		console.log(freeBet);
		console.log("");
		console.log("");
		console.log("");
		*/
		
	return winnings;

int nHands = 100000000;
for (let i = 0; i <= nHands ; i++){
	totalEarnings += playHand(deck);
}
console.log(totalEarnings/nHands);