From 4aaf594e23e90c2412ccfe6009d857c7afbf5c83 Mon Sep 17 00:00:00 2001
From: onyx-and-iris <code@onyxandiris.online>
Date: Thu, 26 Dec 2024 13:12:13 +0000
Subject: [PATCH] add filter function to filter zwires from wires

---
 day-24/internal/one/util.go | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/day-24/internal/one/util.go b/day-24/internal/one/util.go
index c96d3e7..ddc4ab4 100644
--- a/day-24/internal/one/util.go
+++ b/day-24/internal/one/util.go
@@ -13,7 +13,7 @@ const (
 	target
 )
 
-func parseLines(r io.Reader) (map[string]int, map[string]int, []expression, error) {
+func parseLines(r io.Reader) (map[string]int, []expression, error) {
 	initial := make(map[string]int)
 	wires := make(map[string]int)
 	expressions := []expression{}
@@ -52,10 +52,14 @@ func parseLines(r io.Reader) (map[string]int, map[string]int, []expression, erro
 	}
 
 	if err := scanner.Err(); err != nil {
-		return nil, nil, nil, err
+		return nil, nil, err
 	}
 
-	return initial, wires, expressions, nil
+	for k, v := range initial {
+		wires[k] = v
+	}
+
+	return wires, expressions, nil
 }
 
 func mustConv(s string) int {
@@ -82,3 +86,13 @@ func mustConvBinToDec(s string) int {
 	}
 	return int(n)
 }
+
+func filter(wires map[string]int, fn func(string) bool) []zWire {
+	var filtered []zWire
+	for name, value := range wires {
+		if fn(name) {
+			filtered = append(filtered, zWire{name, value})
+		}
+	}
+	return filtered
+}