Use String interpolation or << instead plus which are faster

5 files changed, 5 insertions, 6 deletions

diff --git a/lib/rack/auth/digest/params.rb b/lib/rack/auth/digest/params.rb
index f35a7bab..90ad873f 100644
--- a/lib/rack/auth/digest/params.rb
+++ b/lib/rack/auth/digest/params.rb
@@ -38,7 +38,7 @@ module Rack
 
         def to_s
           map do |k, v|
-            "#{k}=" + (UNQUOTED.include?(k) ? v.to_s : quote(v))
+            "#{k}=" << (UNQUOTED.include?(k) ? v.to_s : quote(v))
           end.join(', ')
         end
 
@@ -50,4 +50,3 @@ module Rack
     end
   end
 end
-
diff --git a/lib/rack/common_logger.rb b/lib/rack/common_logger.rb
index 1ec8266d..ae410430 100644
--- a/lib/rack/common_logger.rb
+++ b/lib/rack/common_logger.rb
@@ -48,7 +48,7 @@ module Rack
         now.strftime("%d/%b/%Y:%H:%M:%S %z"),
         env[REQUEST_METHOD],
         env[PATH_INFO],
-        env[QUERY_STRING].empty? ? "" : "?"+env[QUERY_STRING],
+        env[QUERY_STRING].empty? ? "" : "?#{env[QUERY_STRING]}",
         env[HTTP_VERSION],
         status.to_s[0..3],
         length,
diff --git a/lib/rack/directory.rb b/lib/rack/directory.rb
index 554f9c33..5baee3c8 100644
--- a/lib/rack/directory.rb
+++ b/lib/rack/directory.rb
@@ -155,7 +155,7 @@ table { width:100%%; }
         return format % (int.to_f / size) if int >= size
       end
 
-      int.to_s + 'B'
+      "#{int}B"
     end
   end
 end
diff --git a/lib/rack/multipart/generator.rb b/lib/rack/multipart/generator.rb
index 6367135f..f0b70a8d 100644
--- a/lib/rack/multipart/generator.rb
+++ b/lib/rack/multipart/generator.rb
@@ -22,7 +22,7 @@ module Rack
           else
             content_for_other(file, name)
           end
-        end.join + "--#{MULTIPART_BOUNDARY}--\r"
+        end.join << "--#{MULTIPART_BOUNDARY}--\r"
       end
 
       private
diff --git a/lib/rack/multipart/parser.rb b/lib/rack/multipart/parser.rb
index 567c868d..74a7ee67 100644
--- a/lib/rack/multipart/parser.rb
+++ b/lib/rack/multipart/parser.rb
@@ -26,7 +26,7 @@ module Rack
           str = if left < size
                   @io.read left
                 else
-                 @io.read size
+                  @io.read size
                 end
 
           if str