Add List.reversed to give a reverse fixed-length view of a list.

sdk/lib/core/list.dart

 // Copyright (c) 2012, 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.
 
 part of dart.core;
 
 /**
  * A [List] is an indexable collection with a length. It can be of
  * fixed size or extendable.
  */
@@ skipping 67 matching lines @@
   void addLast(E value);
 
   /**
    * Appends all elements of the [iterable] to the end of this list.
    * Extends the length of the list by the number of elements in [iterable].
    * Throws an [UnsupportedError] if this list is not extensible.
    */
   void addAll(Iterable<E> iterable);
 
   /**
+   * Returns a reversed fixed-length view of this [List].
+   *
+   * The reversed list has elements in the opposite order of this list.
+   * It is backed by this list, but will stop working if this list
+   * becomes shorter than its current length.
+   */
+  List<T> get reversed => new ReversedList(this, 0, length);
+
+  /**
    * Sorts the list according to the order specified by the [compare] function.
    *
    * The [compare] function must act as a [Comparator].
    * The default [List] implementations use [Comparable.compare] if
    * [compare] is omitted.
    */
   void sort([int compare(E a, E b)]);
 
   /**
    * Returns the first index of [element] in the list.
@@ skipping 85 matching lines @@
    * not extendable.
    * If [length] is 0, this method does not do anything.
    * If [start] is the length of the list, this method inserts the
    * range at the end of the list.
    * Throws an [ArgumentError] if [length] is negative.
    * Throws an [RangeError] if [start] is negative or if
    * [start] is greater than the length of the list.
    */
   void insertRange(int start, int length, [E fill]);
 }