From 0511ece2f5b737ec0de96d01b8817ae570ff2518 Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Wed, 22 Oct 2014 00:58:20 -0700
Subject: [PATCH] Use String#<< instead of String#+=
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I just couldn’t believe this but look:

~/jekyll/jekyll#master$ ruby benchmark/string-concat
Calculating -------------------------------------
                  +=      6367 i/100ms
                  <<    128697 i/100ms
-------------------------------------------------
                  +=     1704.3 (±0.6%) i/s -      12734 in   7.472170s
                  <<  4381212.4 (±6.3%) i/s -   21878490 in   5.014899s

WOW.
---
 lib/jekyll/url.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/jekyll/url.rb b/lib/jekyll/url.rb
index 964c619d..8773e018 100644
--- a/lib/jekyll/url.rb
+++ b/lib/jekyll/url.rb
@@ -63,7 +63,7 @@ module Jekyll
         .gsub(/\A([^\/])/, '/\1')
 
       # Append a trailing slash to the URL if the unsanitized URL had one
-      url += "/" if in_url =~ /\/$/
+      url << "/" if in_url =~ /\/$/
 
       url
     end