refactor

src/2023/day11.js

@@ -2,8 +2,7 @@ export function part1(input, add = 1) {
   const map = input.split('\n').map(line => line.split(''));
   let stars = map
     .flatMap((row, y) => row.map((cell, x) => ({ cell, x, y })))
-    .filter(({ cell }) => cell === '#')
-    .map((c, i) => ({ ...c, id: i + 1 }));
+    .filter(({ cell }) => cell === '#');
   let ydiff = 0;
   for (let y = 0; y < map.length; y++) {
     if (map[y].every(c => c === '.')) {
@@ -18,16 +17,12 @@ export function part1(input, add = 1) {
       xdiff += add;
     }
   }
-  const length = stars
-    .map((cell, i) => {
-      return stars.slice(i + 1).reduce((acc, other) => {
-        const distance =
-          Math.abs(cell.x - other.x) + Math.abs(cell.y - other.y);
-        return acc + distance;
-      }, 0);
-    })
-    .reduce((a, b) => a + b);
-  return length;
+  const distances = stars.map((a, i) =>
+    stars
+      .slice(i + 1)
+      .reduce((acc, b) => acc + Math.abs(a.x - b.x) + Math.abs(a.y - b.y), 0),
+  );
+  return distances.reduce((a, b) => a + b);
 }
 
 export function part2(input) {