2021-03.js

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let o2ratings = data.split("\n");
let co2ratings = data.split("\n");

function countOnes(ratings, x) {
	let ones = 0;
	for (y = 0; y < ratings.length; y++) {
		if (ratings[y].charAt(x) == '1') {
			ones++;
		}
	}
	return ones;
}

function filterRatings(ratings, criterion, x) {
	console.log(ratings.length);
	if (ratings.length > 1) {
		return ratings.filter(o2rating => o2rating.charAt(x) == criterion);
	}
	return ratings;
}

function getCriterion(ratings, x, preference, other) {
	const ones = countOnes(ratings, x);
	return ones >= ratings.length / 2
		? preference
		: other;
}

for (let x = 0; x < 12; x++) {
	let criterion = getCriterion(o2ratings, x, "1", "0");
	o2ratings = filterRatings(o2ratings, criterion, x);

	criterion = getCriterion(co2ratings, x, "0", "1");
	co2ratings = filterRatings(co2ratings, criterion, x);
}

const answer = parseInt(o2ratings[0], 2) * parseInt(co2ratings[0], 2);
console.log(answer);