Make 'where' lazy.

runtime/lib/growable_array.dart

Index: runtime/lib/growable_array.dart
diff --git a/runtime/lib/growable_array.dart b/runtime/lib/growable_array.dart
index 1a0bfffe74b76cc84c152db07ece8782d550a370..b63c083e4da78451be7b9dd52136883f730446ec 100644
--- a/runtime/lib/growable_array.dart
+++ b/runtime/lib/growable_array.dart
@@ -184,9 +184,7 @@ class _GrowableObjectArray<T> implements List<T> {
     return Collections.reduce(this, initialValue, combine);
   }
 
-  Collection<T> where(bool f(T element)) {
-    return Collections.where(this, new _GrowableObjectArray<T>(), f);
-  }
+  Iterable<T> where(bool f(T element)) => new FilteredIterable<T>(this, f);

[Lasse Reichstein Nielsen, 2012/11/20 11:44:57]

We can't just inherit this from Iterable?

[floitsch, 2012/11/28 13:49:38]

Yes. we could, but currently this class is not extending any other class. I
didn't want to change this in this CL.

 
   bool every(bool f(T element)) {
     return Collections.every(this, f);