* lisp/emacs-lisp/helpers.el (string-reverse): New function.

etc/NEWS

@@ -788,6 +788,7 @@ frame.
 *** `hash-table-keys'
 *** `hash-table-values'
 *** `string-join`
+*** `string-reverse`
 *** `string-trim-left'
 *** `string-trim-right'
 *** `string-trim'

lisp/ChangeLog

@@ -1,3 +1,7 @@
+2013-11-26  Bozhidar Batsov  <bozhidar@batsov.com>
+
+	* emacs-lisp/helpers.el (string-reverse): New function.
+
 2013-11-26  Michael Albinus  <michael.albinus@gmx.de>
 
 	* net/tramp.el (tramp-file-name-regexp-unified): Support IPv6 host

lisp/emacs-lisp/helpers.el

@@ -41,6 +41,10 @@
   "Join all STRINGS using SEPARATOR."
   (mapconcat 'identity strings separator))
 
+(defsubst string-reverse (str)
+  "Reverse the string STR."
+  (apply 'string (nreverse (string-to-list str))))
+
 (defsubst string-trim-left (string)
   "Remove leading whitespace from STRING."
   (if (string-match "\\`[ \t\n\r]+" string)