From 6efaba7fc58f1f65eef3c00ef2084bbf3b0c0de3 Mon Sep 17 00:00:00 2001
From: Mike Gerwitz <mike@mikegerwitz.com>
Date: Thu, 16 Dec 2010 23:15:42 -0500
Subject: [PATCH] Added util.clone(); does not yet support deep cloning

---
 lib/util.js             | 35 ++++++++++++++++++++++
 test/test-util-clone.js | 65 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 100 insertions(+)
 create mode 100644 test/test-util-clone.js

diff --git a/lib/util.js b/lib/util.js
index 971c000..543ea3e 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -85,6 +85,41 @@ exports.defineSecureProp = function( obj, prop, value )
 }
 
 
+/**
+ * Clones an object
+ *
+ * @param  {Object}  data  object to clone
+ *
+ * @return  {Object}  cloned object
+ */
+exports.clone = function( data )
+{
+    if ( data instanceof Array )
+    {
+        // return a copy of the array
+        return data.slice( 0 );
+    }
+    else if ( data instanceof Object )
+    {
+        var newobj = {};
+
+        // copy data to the new object
+        for ( prop in data )
+        {
+            if ( data.hasOwnProperty( prop ) )
+            {
+                newobj[ prop ] = data[ prop ];
+            }
+        }
+
+        return newobj;
+    }
+
+    // primitive type; cloning unnecessary
+    return data;
+};
+
+
 /**
  * Parses object properties to determine how they should be interpreted in an
  * Object Oriented manner
diff --git a/test/test-util-clone.js b/test/test-util-clone.js
new file mode 100644
index 0000000..c9f704b
--- /dev/null
+++ b/test/test-util-clone.js
@@ -0,0 +1,65 @@
+/**
+ * Tests util.clone
+ *
+ *  Copyright (C) 2010 Mike Gerwitz
+ *
+ *  This file is part of ease.js.
+ *
+ *  ease.js is free software: you can redistribute it and/or modify it under the
+ *  terms of the GNU Lesser General Public License as published by the Free
+ *  Software Foundation, either version 3 of the License, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author  Mike Gerwitz
+ * @package test
+ */
+
+require( './common' );
+
+var assert = require( 'assert' ),
+    util   = require( '../lib/util' );
+
+var arr = [ 1, 2, 3 ],
+    obj = { a: 1, b: 2 };
+
+var arr2 = util.clone( arr ),
+    obj2 = util.clone( obj );
+
+assert.ok(
+    ( arr !== arr2 ),
+    "Cloned array is not the same object as the original"
+);
+
+assert.ok(
+    ( obj !== obj2 ),
+    "Cloned object is not the same object as the original"
+);
+
+// ensure array was properly cloned
+for ( var i = 0, len = arr.length; i < len; i++ )
+{
+    assert.equal(
+        arr2[ i ],
+        arr[ i ],
+        "Array data is properly cloned"
+    );
+}
+
+// ensure object was properly cloned
+for ( prop in obj )
+{
+    assert.equal(
+        obj2[ prop ],
+        obj[ prop ],
+        "Object data is properly cloned"
+    );
+}
+