refactor

Author: shahata

src/2015/day22.js

@@ -1,3 +1,5 @@
+import { memoize } from "../utils/memoize.js";
+
 const spells = {
   Missile: {
     mana: 53,
@@ -76,14 +78,6 @@ function playBoss(game) {
   };
 }
 
-function memoize(fn) {
-  let memo = {};
-  return (...x) => {
-    let s = JSON.stringify(x);
-    return (memo[s] = memo[s] ?? fn(...x));
-  };
-}
-
 let play = memoize(game => {
   if (game.boss.hit <= 0) {
     return 0;

src/2023/day12.js

@@ -1,10 +1,4 @@
-function memoize(fn) {
-  let memo = {};
-  return (...x) => {
-    let s = JSON.stringify(x);
-    return (memo[s] = memo[s] ?? fn(...x));
-  };
-}
+import { memoize } from "../utils/memoize.js";
 
 function advance(options, char) {
   let { len, groups, i, left } = options;

src/2025/day09.js

@@ -41,8 +41,8 @@ export function part2(input) {
   }
 
   const disjoint = (a1, a2, b1, b2) =>
-    (a1 <= b1 && a1 <= b2 && a2 <= b1 && a2 <= b2) ||
-    (a1 >= b1 && a1 >= b2 && a2 >= b1 && a2 >= b2);
+    Math.max(a1, a2) <= Math.min(b1, b2) ||
+    Math.max(b1, b2) <= Math.min(a1, a2);
 
   return squares.find(square => {
     return sides.every(

src/2025/day11.js

@@ -1,29 +1,21 @@
-function memoize(fn) {
-  let memo = {};
-  return (...x) => {
-    let s = JSON.stringify(x);
-    return (memo[s] = memo[s] ?? fn(...x));
-  };
-}
+import { memoize } from "../utils/memoize.js";
 
 let solve = memoize((devices, curr, dac = true, fft = true) => {
   if (curr === "out") return dac && fft ? 1 : 0;
-  if (curr === "dac") dac = true;
-  if (curr === "fft") fft = true;
   return devices[curr].reduce(
-    (sum, next) => sum + solve(devices, next, dac, fft),
+    (sum, next) =>
+      sum + solve(devices, next, dac || curr === "dac", fft || curr === "fft"),
     0,
   );
 });
 
 function parse(input) {
-  let devices = {};
-  input.split("\n").forEach(line => {
-    let [name, rest] = line.split(": ");
-    let outputs = rest.split(" ");
-    devices[name] = outputs;
-  });
-  return devices;
+  return Object.fromEntries(
+    input.split("\n").map(line => {
+      let [name, rest] = line.split(": ");
+      return [name, rest.split(" ")];
+    }),
+  );
 }
 
 export function part1(input) {

src/utils/memoize.js

@@ -0,0 +1,7 @@
+export function memoize(fn) {
+  let memo = {};
+  return (...x) => {
+    let s = JSON.stringify(x);
+    return (memo[s] = memo[s] ?? fn(...x));
+  };
+}