day6.js

function getGroupUnionSize(group) {
	return new Set(group.join("")).size;
}

function sumGroupSizes(groupList, sizeFunction) {
	let sumSizes = 0;
	groupList.forEach(group=>sumSizes+=sizeFunction(group));
	return sumSizes;
}

function getGroupIntersectSize(group) {
	let char = 0, everyoneQuestions = 0;
	for (char;char<group[0].length;char++) {
		if (group.every(individual=>individual.includes(group[0][char]))) {
			everyoneQuestions++;
		}
	}
	return everyoneQuestions;
}

function interpretInput(rawInput) {
	return rawInput.split("\n\n").map(group=>group.split("\n"));
}

input = `sukewbthnjdyv
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console.log(sumGroupSizes(interpretInput(input), getGroupUnionSize));
console.log(sumGroupSizes(interpretInput(input), getGroupIntersectSize));