Day 3

Day 03/Part 1/index.ts

@@ -0,0 +1,24 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    let count = 0;
+
+    const regex = /mul\((?<a>\d{1,3}),(?<b>\d{1,3})\)/gm;
+
+    let m;
+
+    while ((m = regex.exec(data)) !== null) {
+      if (m.index === regex.lastIndex) {
+        regex.lastIndex++;
+      }
+
+      count += parseInt(m[1]??"")*parseInt(m[2]??"")
+    }
+
+
+
+    console.log(count)
+  })
+}

Day 03/Part 2/index.ts

@@ -0,0 +1,27 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    let count = 0;
+
+    data.split("do()").forEach(value => {
+      value.split("don't()").forEach((value1, index) => {
+        if(index != 0) return
+        const regex = /mul\((?<a>\d{1,3}),(?<b>\d{1,3})\)/gm;
+
+        let m;
+
+        while ((m = regex.exec(value1)) !== null) {
+          if (m.index === regex.lastIndex) {
+            regex.lastIndex++;
+          }
+
+          count += parseInt(m[1]??"")*parseInt(m[2]??"")
+        }
+      })
+    })
+
+    console.log(count)
+  })
+}