Year 2023, Day 3

clients/typescript/solutions/S2303.ts

@@ -0,0 +1,30 @@
+import ISolution from "./ISolution.ts";
+
+export default class S2303 implements ISolution {
+    firstPart(input: string): string | number {
+        return input.split('\n')
+            .map((line, index, lines) =>
+                [...line.matchAll(/[0-9]+/g)].filter((val) =>
+                    [lines[index - 1], line, lines[index + 1]].some(s =>
+                        s?.substring(val.index! - 1, val.index! + val[0].length + 1)
+                            .match(/[^0-9.]/g))
+                ).map(s => Number(s[0])))
+            .flat()
+            .reduce((a, b) => a + b, 0);
+    }
+    secondPart(input: string): string | number {
+        return input.split('\n')
+            .map((line, index, lines) =>
+                [...line.matchAll(/\*/g)].map((val) =>
+                    [lines[index - 1], line, lines[index + 1]]
+                        .map(s => [...s.matchAll(/[0-9]+/g)]
+                            .filter((match) => !(match.index! > val.index! + 1 || match.index! + match[0].length < val.index!))
+                            .map(s => Number(s[0])))
+                        .flat()
+                        .map((item, _, arr) => arr.length === 2 ? item : 0)
+                        .reduce((a, b) => a * b)
+                ))
+            .flat()
+            .reduce((a, b) => a + b, 0);
+    }
+}