finished day 3

Author: paulvanbrenk

.aoc_tiles/tiles/2024/03.png

@@ -4,6 +4,7 @@ node_modules
 **/*.js
 **/*.txt
 **/input.*
+**/raw.*
 
 .aoc_tiles/*
 !.aoc_tiles/tiles/

.gitignore

@@ -1,13 +1,16 @@
 <!-- AOC TILES BEGIN -->
 <h1 align="center">
-  2024 - 4 ⭐ - TypeScript
+  2024 - 6 ⭐ - TypeScript
 </h1>
 <a href="src/2024/day1.ts">
   <img src=".aoc_tiles/tiles/2024/01.png" width="161px">
 </a>
 <a href="src/2024/day2.ts">
   <img src=".aoc_tiles/tiles/2024/02.png" width="161px">
 </a>
+<a href="src/2024/day3.ts">
+  <img src=".aoc_tiles/tiles/2024/03.png" width="161px">
+</a>
 <h1 align="center">
   2023 - 50 ⭐ - TypeScript
 </h1>

README.md

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "lint": "prettier -w src/**/*.ts",
-    "run": "tsc -p tsconfig.json && node build/day2.js"
+    "run": "tsc -p tsconfig.json && node build/day3.js"
   },
   "author": "",
   "license": "ISC",

package.json

@@ -0,0 +1,45 @@
+import { readFileSync } from 'fs';
+
+const input = readFileSync('<path to input data>').toString();
+
+function part1(data: string) {
+  const regExp = /mul\((?<left>\d{1,3}),(?<right>\d{1,3})\)/gm;
+
+  const matches = data.matchAll(regExp);
+
+  let result = 0;
+
+  for (let m of matches) {
+    const { left, right } = m.groups!;
+
+    result += Number(left) * Number(right);
+  }
+
+  return result;
+}
+
+function part2(data: string) {
+  const regExp =
+    /(mul\((?<left>\d{1,3}),(?<right>\d{1,3})\))|(do\(\))|(don't\(\))/gm;
+
+  const matches = data.matchAll(regExp);
+
+  let result = 0;
+  let mult = true;
+  for (let m of matches) {
+    const [match] = m;
+    if (match === 'do()') {
+      mult = true;
+    } else if (match === "don't()") {
+      mult = false;
+    } else if (mult) {
+      const { left, right } = m.groups!;
+
+      result += Number(left) * Number(right);
+    }
+  }
+  return result;
+}
+
+console.log(part1(input));
+console.log(part2(input));