From 4008ca942f216b3d7f19a53eed5a8d7d8a53c670 Mon Sep 17 00:00:00 2001
From: Tim Caswell <tim@creationix.com>
Date: Wed, 14 Apr 2010 22:37:33 -0500
Subject: [PATCH] Update Object.prototype.spawn example to use
 Object.defineProperty now that node supports it.

---
 articles/prototypal-inheritance/spawn.js   | 4 ++--
 articles/prototypical-inheritance.markdown | 4 +---
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/articles/prototypal-inheritance/spawn.js b/articles/prototypal-inheritance/spawn.js
index 2660d33..34c82d5 100644
--- a/articles/prototypal-inheritance/spawn.js
+++ b/articles/prototypal-inheritance/spawn.js
@@ -36,7 +36,7 @@ sys.puts(pete);
 
 
 //proto-spawn
-Object.prototype.spawn = function (props) {
+Object.defineProperty(Object.prototype, "spawn", {value: function (props) {
   var defs = {}, key;
   for (key in props) {
     if (props.hasOwnProperty(key)) {
@@ -44,7 +44,7 @@ Object.prototype.spawn = function (props) {
     }
   }
   return Object.create(this, defs);
-}
+}});
 
 //animals2
 var Animal = {
diff --git a/articles/prototypical-inheritance.markdown b/articles/prototypical-inheritance.markdown
index 6989db2..9166365 100644
--- a/articles/prototypical-inheritance.markdown
+++ b/articles/prototypical-inheritance.markdown
@@ -51,7 +51,7 @@ Then you can create hierarchies of objects easily:
 
 ## Using `Object.prototype.spawn`
 
-If you're really brave and don't mind messing with `Object.prototype`, then there is an even shorter way:
+Now that node supports `Object.defineProperty`, we can add methods to `Object.prototype` that are not enumerable and thus don't break stuff.
 
 <prototypal-inheritance/spawn.js#proto-spawn*>
 
@@ -59,8 +59,6 @@ Which is used as:
 
 <prototypal-inheritance/spawn.js#animals2*>
 
-Just make sure to understand that adding enumerable properties to Object.prototype breaks all `for ... in` loops that don't have a `hasOwnProperty` check in them.  You've been warned.
-
 ## Where do we go from here?
 
 I'm not sure if this is a good idea or not.  You give up a lot by not having constructor functions that initialize state of objects.  It could be baked into the `Object.spawn` method, but then you're dealing more with classical OOP emulations.