day 3 (refactor)

day-3/day3.ts

@@ -3,16 +3,16 @@ import * as R from "remeda";
 const regex = new RegExp(/mul\((\d{1,3},\d{1,3}?)\)/g);
 
 export function day3(input: string) {
-	const matches = input.matchAll(regex);
-	const numberPairs = [];
-	for (const match of matches) {
-		numberPairs.push(match[1].split(",").map((v) => Number.parseInt(v, 10)));
-	}
-	return R.pipe(
-		numberPairs,
-		R.map(([a, b]) => a * b),
-		R.sum,
-	) as unknown as number;
+	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) {