Use iterator, moveNext(), current.

sdk/lib/core/iterable.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * The [Iterable] interface allows to get an [Iterator] out of an
  * [Iterable] object.
  *
  * This interface is used by the for-in construct to iterate over an
  * [Iterable] object.
  * The for-in construct takes an [Iterable] object at the right-hand
  * side, and calls its [iterator] method to get an [Iterator] on it.
  *
  * A user-defined class that implements the [Iterable] interface can
  * be used as the right-hand side of a for-in construct.
  */
 abstract class Iterable<E> {
   const Iterable();
 
   /**
    * Returns an [Iterator] that iterates over this [Iterable] object.
    */
-  Iterator<E> iterator();
+  Iterator<E> get iterator;
 
   /**
    * Returns a new collection with the elements [: f(e) :]
    * for each element [:e:] of this collection.
    *
    * Subclasses of [Collection] should implement the [mappedBy] method
    * to return a collection of the same general type as themselves.
    * E.g., [List.mappedBy] should return a [List].
    */
   Collection mappedBy(f(E element)) {
@@ skipping 74 matching lines @@
   bool some(bool f(E element)) {
     for (E element in this) {
       if (f(element)) return true;
     }
     return false;
   }
 
   /**
    * Returns true if there is no element in this collection.
    */
-  bool get isEmpty => !iterator().hasNext;
+  bool get isEmpty => !iterator.moveNext();
 }