From f0c77dae5cf60eea9a63182a3da481e403703d49 Mon Sep 17 00:00:00 2001
From: kangax <juriyzaytsev@ny3-dhcp-77.ithaka.org>
Date: Wed, 23 Jul 2008 10:09:28 -0400
Subject: [PATCH] Subclass Hash#include

---
 CHANGELOG              |    2 ++
 src/hash.js            |    8 ++++++++
 test/unit/hash_test.js |   11 +++++++++++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 1b51da5..cb426af 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Subclass Hash#include to return proper results. [kangax, jddalton, Tobie Langel]
+
 * Improve NodeList detection for Safari's $A function. [Garrett Smith, jddalton]
 
 * Use different tactic to sniff for Opera in order to avoid false positives in IE. [Tobie Langel, jddalton]
diff --git a/src/hash.js b/src/hash.js
index ed96637..d997be0 100644
--- a/src/hash.js
+++ b/src/hash.js
@@ -93,6 +93,14 @@ var Hash = Class.create(Enumerable, (function() {
 
     clone: function() {
       return new Hash(this);
+    },
+
+    include: function(key) {
+      // simulating poorly supported hasOwnProperty
+      return key in this._object && (
+        !(key in Object.prototype) ||
+        Object.prototype[key] !== this._object[key]
+      );
     }
   }
 })());
diff --git a/test/unit/hash_test.js b/test/unit/hash_test.js
index cc3d083..8a0a608 100644
--- a/test/unit/hash_test.js
+++ b/test/unit/hash_test.js
@@ -173,6 +173,17 @@ new Test.Unit.Runner({
     var foo = new FooMaker('bar');
     this.assertEqual("key=bar", new Hash(foo).toQueryString());
     this.assertEqual("key=bar", new Hash(new Hash(foo)).toQueryString());
+  },
+
+  testInclude: function() {
+
+    var h = $H({ foo: undefined, toString: function(){ return 'foo' }, a: 'foo' });
+
+    this.assert(h.include('foo')); // should give true for keys with undefined values
+    this.assert(!h.include('bar')); // but false for inexistent ones
+    this.assert(!h.include('valueOf'));
+    this.assert(h.include('toString')); // should work around IE DontEnum bug
+    this.assert(h.include('a'));
   }
   
 });
\ No newline at end of file
-- 
1.5.5