2024 day 11 wip

2024/day-11/blink-worker.ts

@@ -0,0 +1,40 @@
+import { parentPort, workerData } from "node:worker_threads";
+
+const cache = new Map<number, Array<number>>();
+
+function transformSingleStone(stone: number): number[] {
+	if (cache.has(stone)) {
+		// biome-ignore lint/style/noNonNullAssertion: it's there, I promise
+		return cache.get(stone)!;
+	}
+	if (stone === 0) {
+		cache.set(stone, [1]);
+		return [1];
+	}
+	const numberAsString = stone.toString();
+	const numberOfDigits = numberAsString.length;
+	if (numberOfDigits % 2 === 0) {
+		const middle = numberOfDigits / 2;
+		const left = numberAsString.slice(0, middle);
+		const right = numberAsString.slice(middle);
+		const res = [Number.parseInt(left, 10), Number.parseInt(right, 10)];
+		cache.set(stone, res);
+		return res;
+	}
+
+	const res = [stone * 2024];
+	cache.set(stone, res);
+	return res;
+}
+
+function blink(stones: Array<number>) {
+	const newStones: number[] = [];
+	for (const stone of stones) {
+		newStones.push(...transformSingleStone(stone));
+	}
+	return newStones;
+}
+
+const result = blink(workerData);
+
+parentPort?.postMessage(result);