Year 2024, Day 3

clients/typescript/solutions/S2403.ts

@@ -0,0 +1,26 @@
+import ISolution from "./ISolution.ts";
+
+export default class S2403 implements ISolution {
+  firstPart(input: string): (number | string) | Promise<number | string> {
+    const matches = input.matchAll(/mul\((\d+),(\d+)\)/g);
+    return Array.from(matches).reduce((acc, match) => {
+        return acc + parseInt(match[1]) * parseInt(match[2]);
+    }, 0);
+  }
+  secondPart(input: string): (number | string) | Promise<number | string> {
+    const matches = input.matchAll(/(mul\((\d+),(\d+)\))|(do\(\))|(don't\(\))/g);
+    let en = true;
+    return Array.from(matches).reduce((acc, match) => {
+        const [instruct, _2, a, b] = match;
+        if (instruct === 'do()') en = true;
+        if (instruct === 'don\'t()') en = false;
+        if (instruct.startsWith('mul')) {
+            if (en) {
+                return acc + parseInt(a) * parseInt(b);
+            }
+        }
+        return acc;
+    }, 0);
+  }
+
+}