Merge pull request coffeescript-cookbook#41 from jacobbubu/master

Add clone support for Date and RegExp class

Author: dbrady

chapters/classes_and_objects/cloning.md

@@ -14,6 +14,17 @@ clone = (obj) ->
   if not obj? or typeof obj isnt 'object'
     return obj
 
+  if obj instanceof Date
+    return new Date(obj.getTime()) 
+
+  if obj instanceof RegExp
+    flags = ''
+    flags += 'g' if obj.global?
+    flags += 'i' if obj.ignoreCase?
+    flags += 'm' if obj.multiline?
+    flags += 'y' if obj.sticky?
+    return new RegExp(obj.source, flags) 
+
   newInstance = new obj.constructor()
 
   for key of obj