From b3795d193a92c440dabca6a4353628de2f353c7f Mon Sep 17 00:00:00 2001
From: Jake Rosoman <jkroso@gmail.com>
Date: Tue, 17 Dec 2013 22:48:17 +1300
Subject: [PATCH] add default `child` support

---
 index.js     | 21 +++++++++++++--------
 test/test.js | 11 ++++++++++-
 2 files changed, 23 insertions(+), 9 deletions(-)

diff --git a/index.js b/index.js
index dc27844..459ce9e 100644
--- a/index.js
+++ b/index.js
@@ -24,16 +24,21 @@ function extensible(A){
 };
 
 /**
- * make `B` inherit from `this`. Unless `final`,
- * `B` will also be made extensible.
+ * make `child` inherit from `this`. Unless `final`,
+ * `child` will also be made extensible. If you don't 
+ * pass a `child` a new one will be created.
  *
- * @param {Function} B
+ * @param {Function} [child]
  * @param {Boolean} [final]
- * @return {B}
+ * @return {child}
  */
 
-function extend(B, final){
+function extend(child, final){
+  var A = this;
+  var B = 'function' != typeof child
+    ? function(){ A.apply(this, arguments); }
+    : child;
   !final && extensible(B);
-  inherit(B, this);
-  return B
-};
\ No newline at end of file
+  inherit(B, A);
+  return B;
+};
diff --git a/test/test.js b/test/test.js
index ff44a68..55a8ccb 100644
--- a/test/test.js
+++ b/test/test.js
@@ -31,4 +31,13 @@ describe('A.extend(B, final)', function(){
     assert(new B instanceof A);
     assert(B.extend === undefined);
   })
-})
\ No newline at end of file
+})
+
+describe('A.extend()', function(){
+  it('should create a new function', function(){
+    var A = extensible(function(){ this.touched = true; });
+    var B = A.extend();
+    assert(new B() instanceof A);
+    assert(new B().touched === true);
+  })
+})