Native implementation of List,setRange for frog.

frog/lib/corelib_impl.dart

Index: frog/lib/corelib_impl.dart
===================================================================
--- frog/lib/corelib_impl.dart	(revision 2921)
+++ frog/lib/corelib_impl.dart	(working copy)
@@ -72,7 +72,12 @@
   List<E> getRange(int start, int length) native
     "return this.slice(start, start + length);";
 
-  void setRange(int start, int length, List<E> from, [int startFrom]) native;
+  void setRange(int start, int length, List<E> from, [int startFrom]) native
+    """
+    startFrom = (startFrom === null ? 0 : startFrom);

[jimhug, 2012/01/04 17:38:17]

startFrom == null will do the correct comparison on the JS side to handle either
null or undefined - which is something that the dart compiler will occasionally
rely on.

[dominich, 2012/01/05 18:19:57]

Done.

+    for (var i = 0; i < length; ++i)
+      this[start + i] = from[startFrom + i];
+    """;
   void removeRange(int start, int length) native "this.splice(start, length);";
 
   void insertRange(int start, int length, [E initialValue]) native