d3p2

src/2022/day3/index.ts

@@ -3,7 +3,8 @@ import { readFile, sum } from "../../utils";
 
 let input = readFile(path.resolve(__dirname, 'input.txt'));
 
-const day1 = input.split("\n").map(line => {
+const day1 = input.split("\n")
+    .map(line => {
         const first = line.substring(0, line.length / 2).split('')
         const second = line.substring(line.length / 2).split('')
 
@@ -15,6 +16,15 @@ const day1 = input.split("\n").map(line => {
 console.log("Day1:", day1)
 
 
-const day2 = input;
+const day2 = input.split("\n")
+    .reduce((a, b, c) => {
+        if (c % 3 === 0) a.push([]);
+        a[a.length - 1].push(b);
+        return a;
+    }, []).map(group => {
+        const badge = group[0].split('').filter(ch => group[1].includes(ch) && group[2].includes(ch))[0];
+        const ascii = badge.charCodeAt(0);
+        return ascii > 96 ? ascii - 96 : (ascii - 64 + 26);
+    }).reduce(sum);
 
 console.log("Day2:", day2);