AoC-2017-day2.js

const input =
  "4168	3925	858	2203	440	185	2886	160	1811	4272	4333	2180	174	157	361	1555\n" +
  "150	111	188	130	98	673	408	632	771	585	191	92	622	158	537	142\n" +
  "5785	5174	1304	3369	3891	131	141	5781	5543	4919	478	6585	116	520	673	112\n" +
  "5900	173	5711	236	2920	177	3585	4735	2135	2122	5209	265	5889	233	4639	5572\n" +
  "861	511	907	138	981	168	889	986	980	471	107	130	596	744	251	123\n" +
  "2196	188	1245	145	1669	2444	656	234	1852	610	503	2180	551	2241	643	175\n" +
  "2051	1518	1744	233	2155	139	658	159	1178	821	167	546	126	974	136	1946\n" +
  "161	1438	3317	4996	4336	2170	130	4987	3323	178	174	4830	3737	4611	2655	2743\n" +
  "3990	190	192	1630	1623	203	1139	2207	3994	1693	1468	1829	164	4391	3867	3036\n" +
  "116	1668	1778	69	99	761	201	2013	837	1225	419	120	1920	1950	121	1831\n" +
  "107	1006	92	807	1880	1420	36	1819	1039	1987	114	2028	1771	25	85	430\n" +
  "5295	1204	242	479	273	2868	3453	6095	5324	6047	5143	293	3288	3037	184	987\n" +
  "295	1988	197	2120	199	1856	181	232	564	1914	1691	210	1527	1731	1575	31\n" +
  "191	53	714	745	89	899	854	679	45	81	726	801	72	338	95	417\n" +
  "219	3933	6626	2137	3222	1637	5312	238	5895	222	154	6649	169	6438	3435	4183\n" +
  "37	1069	166	1037	172	258	1071	90	497	1219	145	1206	143	153	1067	510";

function part1(input) {
  return input.split("\n").reduce((total, row) => {
    const items = row.split("\t");
    return (total += Math.max(...items) - Math.min(...items));
  }, 0);
}

function part2(input) {
  return input.split("\n").reduce((total, row) => {
    const items = row.split("\t");
    return (
      total +
      items.reduce((t, item, itemKey) => {
        return (
          t +
          items.reduce((t, next, nextKey) => {
            return itemKey !== nextKey && item % next === 0
              ? t + item / next
              : t;
          }, 0)
        );
      }, 0)
    );
  }, 0);
}

// Part 1
console.log(part1(input));

// Part 2
console.log(part2(input));