feat(day-3): add part 2 solution

1 files changed, 10 insertions, 6 deletions

diff --git a/day-3/script.ts b/day-3/script.ts
index 1793e48..f693928 100644
--- a/day-3/script.ts
+++ b/day-3/script.ts
@@ -19,10 +19,11 @@ const symbols = Array.from(chars.matchAll(/[^\.\d]/g)).map((match) => ({
   position: match.index || 0,
 }));
 
-const result = numbers
-  .filter((number) => {
-    return !!symbols.find(
-      (symbol) =>
+const result = symbols
+  .filter((symbol) => symbol.symbol === "*")
+  .reduce((acc, symbol) => {
+    const adjacentNumbers = numbers.filter(
+      (number) =>
         symbol.position === number.position.start - 1 ||
         symbol.position === number.position.end ||
         (symbol.position >= number.position.start - 1 - lineLength &&
@@ -30,7 +31,10 @@ const result = numbers
         (symbol.position >= number.position.start - 1 + lineLength &&
           symbol.position <= number.position.end + lineLength),
     );
-  })
-  .reduce((acc, number) => acc + number.number, 0);
+
+    return adjacentNumbers.length === 2
+      ? acc + adjacentNumbers[0].number * adjacentNumbers[1].number
+      : acc;
+  }, 0);
 
 console.log({ result });