test (v3)

const determineWinner = function(match, tournament) {
	let total = 0;
	for (let i = 0; i < 3; i++) {
		total += tournament.winPercentages[i];
		if (Math.random() < total) {
			return match[i];
		}
	}
}
determineWinner(["a", "b", "c"], {"winPercentages": [0.34, 0.33, 0.33]})

const determineWinner = function(match, tournament) {
	let total = 0;
	total += tournament.winPercentages[0];
	if (Math.random() < total) {
		return match[0];
	}
	total += tournament.winPercentages[1];
	if (Math.random() < total) {
		return match[1];
	}
	total += tournament.winPercentages[2];
	if (Math.random() < total) {
		return match[2];
	}
}
determineWinner(["a", "b", "c"], {"winPercentages": [0.34, 0.33, 0.33]})

const determineWinner = function(match, tournament) {
	let total = 0;
	const rand = Math.random()
	total += tournament.winPercentages[0];
	if (rand < total) {
		return match[0];
	}
	total += tournament.winPercentages[1];
	if (rand < total) {
		return match[1];
	}
	total += tournament.winPercentages[2];
	if (rand < total) {
		return match[2];
	}
}
determineWinner(["a", "b", "c"], {"winPercentages": [0.34, 0.33, 0.33]})

const determineWinner = function(match, tournament) {
	let total = 0;
	const rand = Math.random();
	for (let i in tournament.winPercentages) {
		total += tournament.winPercentages[i];
		if (rand < total) {
			return match[i];
		}
	}
}
determineWinner(["a", "b", "c"], {"winPercentages": [0.34, 0.33, 0.33]})