From 562fc231a4cb4057a4d1741fe3eecc2239324fab Mon Sep 17 00:00:00 2001
From: David Ashby <delta.mu.alpha@gmail.com>
Date: Mon, 20 Dec 2021 18:42:36 -0500
Subject: [PATCH] remove unnecessary slice boxing

---
 16/main.go | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/16/main.go b/16/main.go
index e89d830..d79eb95 100644
--- a/16/main.go
+++ b/16/main.go
@@ -95,9 +95,9 @@ func parsePayload(stream []uint8) (int64, int) {
 	return parseNumber(num, chars), pos
 }
 
-func parsePackets(stream []uint8) (int, []packet) {
+func parsePackets(stream []uint8) (int, packet) {
 	if len(stream) <= 7 {
-		return 0, []packet{}
+		return 0, packet{}
 	}
 	parsedPacket := packet{}
 	parsedPacket.version = getPacketVersion(stream[0:3])
@@ -105,29 +105,28 @@ func parsePackets(stream []uint8) (int, []packet) {
 	if parsedPacket.typeID == 4 {
 		encoded, consumed := parsePayload(stream[6:])
 		parsedPacket.encodedNumber = encoded
-		return consumed + 6, []packet{parsedPacket} // 6 is packet header length
+		return consumed + 6, parsedPacket // 6 is packet header length
 	} else {
 		parsed := 0
 		size, subpacketlength := getSubpacketLength(stream[6], stream[7:])
 		for {
 			consumed, subs := parsePackets(stream[7+size+parsed:])
-			parsedPacket.subPackets = append(parsedPacket.subPackets, subs...)
+			parsedPacket.subPackets = append(parsedPacket.subPackets, subs)
 			parsed += consumed
 			if size == 11 && int64(len(parsedPacket.subPackets)) == subpacketlength {
-				return parsed + 7 + size, []packet{parsedPacket}
+				return parsed + 7 + size, parsedPacket
 
 			} else if size == 15 && int64(parsed) > subpacketlength || consumed == 0 {
-				return parsed + 7 + size, []packet{parsedPacket}
+				return parsed + 7 + size, parsedPacket
 			}
 		}
 	}
 }
 
-func countVersions(packets []packet) int {
-	i := 0
-	for _, p := range packets {
-		i += int(p.version)
-		i += countVersions(p.subPackets)
+func countVersions(pac packet) int {
+	i := int(pac.version)
+	for _, p := range pac.subPackets {
+		i += countVersions(p)
 	}
 	return i
 }
@@ -142,6 +141,7 @@ func partOne() {
 		stream = append(stream, hexMap[hex]...)
 	}
 	_, parsedPacket := parsePackets(stream)
+	fmt.Println(parsedPacket)
 	fmt.Println(countVersions(parsedPacket))
 }