[ts] 2024:03: Solve day03

Author: kiriDevs

2024/day03/day03.ts

@@ -0,0 +1,32 @@
+// @ts-ignore - tl_ls is missing @types/node
+import { EOL } from "node:os";
+// @ts-ignore - tl_ls doesn't know about Bun
+const input = (await Bun.file("input").text()).trim().replaceAll(EOL, " ");
+
+let allMulInstructions = 0;
+let activeMulInstructions = 0;
+
+let ctx: string = "";
+let conditionalsEnabled = true;
+for (let char of input) {
+    ctx += char;
+    if (ctx.endsWith("do()")) {
+        conditionalsEnabled = true;
+        ctx = "";
+    } else if (ctx.endsWith("don't()")) {
+        conditionalsEnabled = false;
+        ctx = "";
+    } else {
+        const mulInstruction = ctx.match(/mul\((\d{1,3}),(\d{1,3})\)$/);
+        if (!mulInstruction) continue;
+
+        const result = parseInt(mulInstruction[1]) * parseInt(mulInstruction[2]);
+        allMulInstructions += result;
+        if (conditionalsEnabled) {
+            activeMulInstructions += result;
+        }
+    }
+}
+
+console.log("Part 1:", allMulInstructions);
+console.log("Part 2:", activeMulInstructions);