Day 2 Puzzle 1

day2.ts

@@ -0,0 +1,22 @@
+import fs from "node:fs";
+
+const input = fs.readFileSync("inputs/day2").toString();
+
+const rows = input.split("\n").filter(Boolean);
+
+function safe_levels(_row: number[]) {
+    const row = [..._row];
+    while (row.length > 1) {
+        const diff = row[1] - row[0];
+        if (diff > 3 || diff < 1) return false;
+        row.shift();
+    }
+    return true;
+}
+
+function puzzle1() {
+    return rows.map((row) => row.split(/\s+/g).map(i => +i))
+    .filter(row => safe_levels(row) || safe_levels(row.toReversed())).length;
+}
+
+console.log("Puzzle 1", puzzle1());