diff --git a/README.txt b/README.txt
index 33d64ed8..a888d72f 100644
--- a/README.txt
+++ b/README.txt
@@ -228,7 +228,7 @@ HISTORY
   2011-07-12, v1.8.1, Upgraded jslint4java and JSLint, updated Ant macro
   2011-08-14, v1.8.2, Project deleted by Legal-Box, moved to eric-brechemier
   2013-09-09, v1.8.3, Add no() to Sandbox utils API
-  2013-XX-XX, v1.8.4, ROADMAP: Add a = or(a,b) to Sandbox utils API
+  2013-09-10, v1.8.4, Add or() to Sandbox utils API
   2013-XX-XX, v1.9.0, ROADMAP: add foreach(), map(), reduce() in array API
   2013-XX-XX, v1.10.0, ROADMAP: add animate() method to CSS API of Sandbox
 
diff --git a/src/lb/lb.core.Sandbox.js b/src/lb/lb.core.Sandbox.js
index 8ad3b164..202fa775 100644
--- a/src/lb/lb.core.Sandbox.js
+++ b/src/lb/lb.core.Sandbox.js
@@ -53,7 +53,8 @@
  *   - <lb.core.plugins.url.sandbox.url.onHashChange(callback)>
  *
  * General utilities (sandbox.utils):
- *   TODO: add no() to sandbox.utils
+ *   - <lb.core.plugins.utils.sandbox.utils.no(value): boolean>
+ *   - <lb.core.plugins.utils.sandbox.utils.or(a,b): any>
  *   - <lb.core.plugins.utils.sandbox.utils.has(object,property[,...]): boolean>
  *   - <lb.core.plugins.utils.sandbox.utils.is([...,]value[,type]): boolean>
  *   - <lb.core.plugins.utils.sandbox.utils.getTimestamp(): number>
@@ -72,7 +73,7 @@
  * o Marc Delhommeau <marc.delhommeau@legalbox.com>
  *
  * Copyright:
- * Eric Bréchemier (c) 2011, Some Rights Reserved
+ * Eric Bréchemier (c) 2011-2013, Some Rights Reserved
  * Legal-Box SAS (c) 2010-2011, All Rights Reserved
  *
  * License:
@@ -80,7 +81,7 @@
  * http://creativecommons.org/licenses/BSD/
  *
  * Version:
- * 2011-08-14
+ * 2013-09-10
  */
 /*global define, document, window */
 define(
diff --git a/src/lb/lb.core.plugins.utils.js b/src/lb/lb.core.plugins.utils.js
index a0dce24b..5ae2d0c2 100644
--- a/src/lb/lb.core.plugins.utils.js
+++ b/src/lb/lb.core.plugins.utils.js
@@ -15,7 +15,7 @@
  * http://creativecommons.org/licenses/BSD/
  *
  * Version:
- * 2013-09-09
+ * 2013-09-10
  */
 /*global define, window */
 define(
@@ -47,6 +47,7 @@ define(
 
       // Declare aliases
       var no = lbBase.no,
+          or = lbBase.or,
           has = object.has,
           is = type.is,
           trim = string.trim,
@@ -83,6 +84,33 @@ define(
 
       // Note: no() is an alias for lb.base.no
 
+      // Function: sandbox.utils.or(a,b): any
+      // Get a default value when given value is null or undefined
+      //
+      // The intent of this method is to replace unsafe initialization of
+      // optional parameters to a default value relying on type coercion:
+      // | function on(event,options){
+      // |   options = options || {}; // type coercion
+      // |   var isUser = options.isUser || false; // type coercion
+      // |   // ...
+      // | }
+      // with a safer initialization without type coercion:
+      // | function on(event,options){
+      // |   options = or(options, {}); // no type coercion
+      // |   var isUser = or(options.isUser, false); // no type coercion
+      // |   // ...
+      // | }
+      //
+      // Parameters:
+      //   a - any, the value to check
+      //   b - any, the default value
+      //
+      // Returns:
+      //   any, the default value when the value is null or undefined,
+      //   the value itself otherwise.
+
+      // Note: or() is an alias for lb.base.or
+
       // Function: sandbox.utils.has(object,property[,...]): boolean
       // Check whether an object property is present and not null nor undefined.
       //
@@ -205,8 +233,6 @@ define(
 
       // Note: is() is an alias for lb.base.type.is
 
-      // TODO: add no() to utils plugin and sandbox
-
       function getTimestamp(){
         // Function: sandbox.utils.getTimestamp(): number
         // Get current timestamp, in milliseconds.
@@ -290,6 +316,7 @@ define(
 
       sandbox.utils = {
         no: no,
+        or: or,
         has: has,
         is: is,
         getTimestamp: getTimestamp,