day one

.gitignore

@@ -0,0 +1,4 @@
+.cookie
+node_modules
+
+*/inputs

01/index.ts

@@ -0,0 +1,59 @@
+import fs from "node:fs";
+
+const data = fs.readFileSync("./inputs/input", "utf8");
+
+console.log(
+  "part one:",
+  data
+    .split("\n")
+    .slice(0, -1) // remove empty trailing newline
+    .map(
+      (v) => v.split(" ").filter((c) => c) // abusing js string nullity to remove empty members
+    )
+    .reduce(
+      (result, current) => {
+        // build two arrays, one of each column
+        result[0].push(parseInt(current[0], 10));
+        result[1].push(parseInt(current[1], 10));
+        return result;
+      },
+      [[], []] as Array<Array<number>>
+    )
+    .map((list) => [...list].sort()) // hacky return-sorted-values step
+    .reduce((result, current) => {
+      // rotate arrays into pairs
+      current.forEach((n, i) => {
+        result[i] === undefined ? (result[i] = [n]) : result[i].push(n);
+      });
+      return result;
+    }, [] as Array<Array<number>>)
+    .reduce((result, current) => {
+      // do the math
+      return result + Math.abs(current[0] - current[1]);
+    }, 0)
+);
+
+console.log(
+  "part two:",
+  Object.entries(
+    data
+      .split("\n")
+      .slice(0, -1) // remove empty trailing newline
+      .map(
+        (v) => v.split(" ").filter((c) => c) // abusing js string nullity to remove empty members
+      )
+      .reduce((result, current) => {
+        // build one object that contains the full set of frequencies
+        result[current[0]] = !result[current[0]]
+          ? [1, 0]
+          : [result[current[0]][0] + 1, result[current[0]][1]];
+        result[current[1]] = !result[current[1]]
+          ? [0, 1]
+          : [result[current[1]][0], result[current[1]][1] + 1];
+        return result;
+      }, [] as Array<Array<number>>)
+  ).reduce((result, current) => {
+    // and then just reduce down the object.
+    return result + parseInt(current[0], 10) * current[1][0] * current[1][1];
+  }, 0)
+);

package-lock.json

@@ -0,0 +1,29 @@
+{
+  "name": "AdventOfCode2024",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "devDependencies": {
+        "@types/node": "^22.10.1"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "22.10.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.10.1.tgz",
+      "integrity": "sha512-qKgsUwfHZV2WCWLAnVP1JqnpE6Im6h3Y0+fYgMTasNQ7V++CBX5OT1as0g0f+OyubbFqhf6XVNIsmN4IIhEgGQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.20.0"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.20.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.20.0.tgz",
+      "integrity": "sha512-Ny6QZ2Nju20vw1SRHe3d9jVu6gJ+4e3+MMpqu7pqE5HT6WsTSlce++GQmK5UXS8mzV8DSYHrQH+Xrf2jVcuKNg==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}

package.json

@@ -0,0 +1,5 @@
+{
+  "devDependencies": {
+    "@types/node": "^22.10.1"
+  }
+}

run.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+__year=2024
+
+__day="${1}"
+if [ -z "${__day}" ]; then
+    __day=$(date '+%d')
+fi
+
+padded=$(printf "%02g" ${__day})
+if [ -f "${padded}/index.ts" ]; then
+    cd $padded
+    npx tsx "index.ts" 2>/dev/null
+    cd - >/dev/null
+else
+    echo "day not found"
+fi

today.sh

@@ -3,7 +3,7 @@
 __year=2024
 
 __day="${1}"
-if [ "${day}" == ""]; then
+if [ "${__day}" == "" ]; then
     __day=$(date '+%d')
 fi
 
@@ -15,7 +15,4 @@ if [ ! -f "${padded}/inputs/input" ]; then
         -A "https://git.yetaga.in/alazyreader/AdventOfCode${__year}/" \
         -H "Cookie: session=`cat .cookie`" https://adventofcode.com/${__year}/day/${__day##0}/input > "${padded}/inputs/input"
 fi
-# if [ ! -f "${padded}/main.go" ]; then
+open "https://adventofcode.com/${__year}/day/${__day##0}"
-#     cp -n main.go.tmpl ${padded}/main.go
-# fi
-open "https://adventofcode.com/${__year}/day/${__day}"