From f420a8f32dc1cc6a6c637a70a630629159f46850 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Tue, 4 Nov 2025 22:11:46 -0600
Subject: [PATCH] [ld2420] Eliminate substr() allocation in firmware version
 parsing

---
 esphome/components/ld2420/ld2420.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/ld2420/ld2420.cpp b/esphome/components/ld2420/ld2420.cpp
index b48c336d4e..f544acc112 100644
--- a/esphome/components/ld2420/ld2420.cpp
+++ b/esphome/components/ld2420/ld2420.cpp
@@ -174,7 +174,7 @@ static uint8_t calc_checksum(void *data, size_t size) {
 static int get_firmware_int(const char *version_string) {
   std::string version_str = version_string;
   if (version_str[0] == 'v') {
-    version_str = version_str.substr(1);
+    version_str.erase(0, 1);
   }
   version_str.erase(remove(version_str.begin(), version_str.end(), '.'), version_str.end());
   int version_integer = stoi(version_str);