Solve 2023 day 4 part 1

Author: garritfra

2023/Day4/javascript/solve.js

@@ -0,0 +1,40 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const input = fs
+  .readFileSync(path.join(__dirname, "../input.txt"), "utf8")
+  .split("\n")
+  .filter((line) => line !== "");
+
+const part1 = (cards) => {
+  const results = [];
+  for (const card of cards) {
+    const [_, winnindNumbersString, drawnNumbersString] =
+      /Card +\d+: ([ \d]+) +\| +([ \d]+)/.exec(card);
+    const winnindNumbers = winnindNumbersString
+      .trim()
+      .split(" ")
+      .map((num) => Number.parseInt(num, 10))
+      .filter((num) => !isNaN(num));
+
+    const drawnNumbers = drawnNumbersString
+      .trim()
+      .split(" ")
+      .map((num) => Number.parseInt(num, 10))
+      .filter((num) => !isNaN(num));
+
+    let matches = [];
+
+    for (const num of drawnNumbers) {
+      if (winnindNumbers.includes(num)) {
+        matches.push(num);
+      }
+    }
+
+    matches.length > 0 && results.push(2 ** (matches.length - 1));
+  }
+
+  return results.reduce((sum, curr) => sum + curr, 0);
+};
+
+console.log(part1(input));