Fix issue 1741: add map to immutable list.

runtime/lib/array.dart

Index: runtime/lib/array.dart
===================================================================
--- runtime/lib/array.dart	(revision 4542)
+++ runtime/lib/array.dart	(working copy)
@@ -216,6 +216,10 @@
     Collections.forEach(this, f);
   }
 
+  Collection map(f(E element)) {
+    return Collections.map(this, new GrowableObjectArray.withCapacity(length), f);
+  }
+

[siva, 2012/02/23 19:11:46]

Not for this change list but maybe a future refactor:

There seem to be a number of functions between ImmutableArray and ObjectArray
which are identical. Maybe we can have a baseclass which implements all these
common methods and ObjectArray and ImmutableArray can be derived from this base
class.

[srdjan, 2012/02/23 19:23:24]

We need mixins :-). Having subclass hierarchies just for code reuse is wrong,
AFAIK.

   Collection<E> filter(bool f(E element)) {
     return Collections.filter(this, new GrowableObjectArray<E>(), f);
   }