Make 'where' lazy.

runtime/lib/array.dart

Index: runtime/lib/array.dart
diff --git a/runtime/lib/array.dart b/runtime/lib/array.dart
index 89a550b7d6c7b595f0f4215fb26b28bc4dce66ae..5a06b674833410315c537fbb9e926153a24ce0cb 100644
--- a/runtime/lib/array.dart
+++ b/runtime/lib/array.dart
@@ -73,9 +73,7 @@ class _ObjectArray<E> implements List<E> {
     return Collections.reduce(this, initialValue, combine);
   }
 
-  Collection<E> where(bool f(E element)) {
-    return Collections.where(this, new _GrowableObjectArray<E>(), f);

[Anders Johnsen, 2012/11/20 06:32:21]

You could clean up Collections as you go on with this, to make sure we remove
the functions.

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

I usually remove the functions there.

-  }
+  Iterable<E> where(bool f(E element)) => new FilteredIterable<E>(this, f);

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

FilteredIterable => WhereIterable

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

Done.

 
   bool every(bool f(E element)) {
     return Collections.every(this, f);
@@ -218,9 +216,7 @@ class _ImmutableArray<E> implements List<E> {
     return Collections.reduce(this, initialValue, combine);
   }
 
-  Collection<E> where(bool f(E element)) {
-    return Collections.where(this, new _GrowableObjectArray<E>(), f);
-  }
+  Iterable<E> where(bool f(E element)) => new FilteredIterable<E>(this, f);
 
   bool every(bool f(E element)) {
     return Collections.every(this, f);