Add reduce to Collection.

corelib/src/implementation/hash_map_set.dart

Index: corelib/src/implementation/hash_map_set.dart
diff --git a/corelib/src/implementation/hash_map_set.dart b/corelib/src/implementation/hash_map_set.dart
index c538951fff31beb62674103b8c7517339c0c8ded..6141967d93c76401709859b63d09efedc7e0bd67 100644
--- a/corelib/src/implementation/hash_map_set.dart
+++ b/corelib/src/implementation/hash_map_set.dart
@@ -350,6 +350,10 @@ class HashSetImplementation<E extends Hashable> implements HashSet<E> {
     return result;
   }
 
+  reduce(var init, f(var prev, E element)) {

[Lasse Reichstein Nielsen, 2012/08/08 07:19:14]

Return type, variable names unabbreviated.

[Anders Johnsen, 2012/08/08 07:56:14]

Done / see other comments.

+    return Collections.reduce(this, init, f);
+  }
+
   Set<E> filter(bool f(E element)) {
     Set<E> result = new Set<E>();
     _backingMap.forEach(void _(E key, E value) {