day3

day3/pt1.ts

@@ -0,0 +1,9 @@
+const input = await Bun.file('./inputs/day3').text();
+const regex = /mul\((?<first>\d+)\,(?<second>\d+)\)/g;
+
+const total = input
+  .matchAll(regex)
+  .map(({ groups }) => Number(groups!.first) * Number(groups!.second))
+  .reduce((curr, acc) => curr + acc);
+
+console.log(`sum of mult: ${total}`);

day3/pt2.ts

@@ -0,0 +1,12 @@
+const input = await Bun.file('./inputs/day3').text();
+const regex = /(?<instruction>do|don't)\(\)|mul\((?<first>\d+)\,(?<second>\d+)\)/g;
+
+let enabled = true;
+let total = 0;
+input.matchAll(regex).forEach(({ groups }) => {
+  if (groups!.instruction === 'do') enabled = true;
+  else if (groups!.instruction === "don't") enabled = false;
+  else if (enabled) total += Number(groups!.first) * Number(groups!.second);
+});
+
+console.log(`sum of mult with do/don't: ${total}`);