const binary = (list , item) => {
	let min = 0;
	let max = list.length - 1;
	let guess;

	while (min <= max) {
		guess = Math.floor((min + max) / 2);

		if (list[guess] === item) {
			return guess;
		} else {
			if (list[guess] < item) {
				min = guess + 1;
			} else {
				max = guess - 1;
			}
		}
	}

	return -1;
};

console.log(binary([2, 3, 64, 90, 200], 90))