From 32f00ea017f987c08ee719aed18a33ee774b4c8e Mon Sep 17 00:00:00 2001
From: Bas Dado <bas@gametailors.com>
Date: Thu, 2 Dec 2021 22:04:51 +0100
Subject: [PATCH] [TASK] Day 2 Part 2

---
 functions/src/day2.ts | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/functions/src/day2.ts b/functions/src/day2.ts
index 3c32137..99a0597 100644
--- a/functions/src/day2.ts
+++ b/functions/src/day2.ts
@@ -18,14 +18,27 @@ class Day2 {
 
   static part2(input: string[]): number {
 
-    
-    // TODO implement
-    return 0;
+    let depth = 0;
+    let aim = 0;
+    let x = 0;
+    for (const entry of input) {
+
+      if (entry.startsWith("up")) {
+        aim -= this.readUnits(entry);
+      } else if (entry.startsWith("down")) {
+        aim += this.readUnits(entry);
+      } else if (entry.startsWith("forward")) {
+        const movement = this.readUnits(entry);
+        depth += aim * movement;
+        x += movement;
+      }
+    }
+    return x * depth;
   }
 
   private static readUnits(input: string): number {
-    return parseInt(input.substr(input.indexOf(' ') + 1));
+    return parseInt(input.substr(input.indexOf(" ") + 1));
   }
 }
 
-export default Day2;
\ No newline at end of file
+export default Day2;