From e28318c2711a1a3410fcefe2a6f292656056aeb3 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Sun, 21 Aug 2016 20:26:51 +0100
Subject: Micro-optimise _format_jid.

---
 slixmpp/jid.py | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

diff --git a/slixmpp/jid.py b/slixmpp/jid.py
index 2e23e242..337aca2a 100644
--- a/slixmpp/jid.py
+++ b/slixmpp/jid.py
@@ -208,16 +208,15 @@ def _format_jid(local=None, domain=None, resource=None):
 
     :return: A full or bare JID string.
     """
-    result = []
+    if domain is None:
+        return ''
     if local is not None:
-        result.append(local)
-        result.append('@')
-    if domain is not None:
-        result.append(domain)
+        result = local + '@' + domain
+    else:
+        result = domain
     if resource is not None:
-        result.append('/')
-        result.append(resource)
-    return ''.join(result)
+        result += '/' + resource
+    return result
 
 
 class InvalidJID(ValueError):
-- 
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