day2.js

require('./newStdLib');
const advent = require('./advent');
const input = 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function part1(input) {
	var initial = {1:0, 2:0, 3:0, 4:0, 5:0, 6:0};
	var res = input
		.map(v => v.split(""))
		.map(v => v.uniqc())
		.map(v => v.uniqc())
		.reduce((a, v) => {Object.keys(v).forEach(k => a[k]++); return a}, initial);
	return res[2] * res[3];
}

function part2(input) {
	var sets = input
		.map(v => v.split(""));
	for(var i = 0; i < sets.length; i++) {
		inner: for(var j = i+1; j < sets.length; j++) {
			var diff = 0;
			var out = [];
			for (var k = 0; k < sets[0].length; k++) {
				if (sets[i][k] != sets[j][k]) {
					diff++
				} else {
					out.push(sets[j][k]);
				}
				if (diff > 1) continue inner;
			}
			return out.join('');
		}
	}
}

advent.test(part1, ["abcdef","bababc","abbcde","abcccd","aabcdd","abcdee","ababab"], 12);
advent.run(part1, input);

advent.test(part2, ['abcde','fghij','klmno','pqrst','fguij','axcye','wvxyz'], 'fgij');
advent.run(part2, input);