day 7 part 1

07/index.ts

@@ -0,0 +1,47 @@
+import fs from "node:fs";
+import { printTime, now } from "../util";
+
+const test = false;
+
+const data = fs.readFileSync(
+  test ? "./inputs/testinput" : "./inputs/input",
+  "utf8"
+);
+
+const doubler = (t: Array<number>, c: number) => [...t, c, c];
+const permute = (curr: number) => (v: number, i: number) =>
+  i % 2 === 0 ? v * curr : v + curr;
+
+let timer = now.instant();
+console.log(
+  "part one:",
+  data
+    .split("\n")
+    .slice(0, -1)
+    .reduce((coll, curr) => {
+      // there's probably a cleaner way to do this
+      let [stringtotal, inputs] = curr.split(": ");
+      let total = parseInt(stringtotal, 10);
+      const res = inputs
+        .split(" ")
+        .map((v) => parseInt(v, 10))
+        .reduce((coll, curr, i) => {
+          if (i === 0) {
+            return [curr];
+          }
+          return coll.reduce(doubler, [] as Array<number>).map(permute(curr));
+        }, [] as Array<number>);
+      if (res.includes(total)) {
+        return coll + total;
+      }
+      return coll;
+    }, 0),
+  printTime(now.instant().since(timer))
+);
+
+timer = now.instant();
+console.log(
+  "part two:",
+  data.split("\n").slice(0, -1),
+  printTime(now.instant().since(timer))
+);