List.unmodifiable

tool/input_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;
 
 /**
  * An indexable collection of objects with a length.
  *
  * Subclasses of this class implement different kinds of lists.
@@ skipping 104 matching lines @@
     } else {
       result = new List<E>(length);
     }
     for (int i = 0; i < length; i++) {
       result[i] = generator(i);
     }
     return result;
   }
 
   /**
+   * Creates an unmodifiable list containing all [elements].
+   *
+   * The [Iterator] of [elements] provides the order of the elements.
+   *
+   * An unmodifiable list cannot have its length or elements changed.
+   * If the elements are themselves immutable, then the resulting list
+   * is also immutable.
+   */
+  external factory List.unmodifiable(Iterable elements);
+
+  /**
    * Returns the object at the given [index] in the list
    * or throws a [RangeError] if [index] is out of bounds.
    */
   E operator [](int index);
 
   /**
    * Sets the value at the given [index] in the list to [value]
    * or throws a [RangeError] if [index] is out of bounds.
    */
   void operator []=(int index, E value);
@@ skipping 319 matching lines @@
    * as values. The `Map.keys` [Iterable] iterates the indices of this list
    * in numerical order.
    *
    *     List<String> words = ['fee', 'fi', 'fo', 'fum'];
    *     Map<int, String> map = words.asMap();
    *     map[0] + map[1];   // 'feefi';
    *     map.keys.toList(); // [0, 1, 2, 3]
    */
   Map<int, E> asMap();
 }