feat(js): add solutions for 2023 day 3

js/.eslintrc

@@ -23,7 +23,8 @@
     "no-unused-vars": ["warn", {
       "argsIgnorePattern": "^_",
       "varsIgnorePattern": "^_"
-    }]
+    }],
+    "object-curly-newline": "off"
   },
   "overrides": [
     {

js/src/2023/03/index.js

@@ -0,0 +1,59 @@
+import { Grid, cast, isNumber, multiply, solution, sum } from '../../utils';
+
+const EMPTY = '.';
+const GEAR = '*';
+
+const parse = (input) => Grid.from(input, { cast });
+
+const isGear = (point) => point.value === GEAR;
+const isSymbol = (point) => !isNumber(point.value) && point.value !== EMPTY;
+
+const process = (schema) => {
+  const parts = [];
+  let current = { part: 0, gears: new Set(), valid: false };
+  for (const point of schema.points) {
+    const { neighbors, value } = point;
+
+    if (!isNumber(value)) continue;
+
+    current.part = current.part * 10 + value;
+
+    for (const neighbor of neighbors) {
+      if (isSymbol(neighbor)) {
+        current.valid = true;
+      }
+      if (isGear(neighbor)) {
+        current.gears.add(neighbor);
+      }
+    }
+
+    if (!point.right || !isNumber(point.right.value)) {
+      if (current.valid) {
+        // Have reached the end of a valid part number
+        parts.push(current.part);
+        for (const gear of current.gears) {
+          (gear.parts ||= []).push(current.part);
+        }
+      }
+      current = { part: 0, gears: new Set(), valid: false };
+    }
+  }
+
+  const gears = schema.filter((point) => (
+    isGear(point) && point.parts.length === 2
+  ));
+
+  return { parts, gears };
+};
+
+export const partOne = solution((input) => {
+  const schema = parse(input);
+  const { parts } = process(schema);
+  return sum(parts);
+});
+
+export const partTwo = solution((input) => {
+  const schema = parse(input);
+  const { gears } = process(schema);
+  return sum(gears.map((gear) => multiply(gear.parts)));
+});

puzzles/2023/03/examples.yaml

@@ -0,0 +1,17 @@
+part-one:
+  - input: &example1 |
+      467..114..
+      ...*......
+      ..35..633.
+      ......#...
+      617*......
+      .....+.58.
+      ..592.....
+      ......755.
+      ...$.*....
+      .664.598..
+    answer: 4361
+
+part-two:
+  - input: *example1
+    answer: 467835