move things around a bit

2024/day-3/day3.ts

@@ -0,0 +1,26 @@
+import * as R from "remeda";
+
+const regex = new RegExp(/mul\((\d{1,3},\d{1,3}?)\)/g);
+
+export function day3(input: string) {
+	return R.sum(
+		input
+			.matchAll(regex)
+			.map((match) => {
+				// match[1] looks like "2,4"
+				const [a, b] = match[1].split(",").map((v) => Number.parseInt(v, 10));
+				return a * b;
+			})
+			.toArray(),
+	);
+}
+
+export function day3part2(input: string) {
+	const parts = input.split("do()");
+	return R.sum(
+		parts.map((part) => {
+			const [toDo] = part.split("don't()");
+			return day3(toDo);
+		}),
+	);
+}