Refactor List.setRange function.

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.
  *
  * A `List` implementation can choose not to support all methods
@@ skipping 245 matching lines @@
    *
    *     var list = [1, 2, 3, 4, 5];
    *     var range = list.getRange(1, 4);
    *     print(range.join(', '));  // => 2, 3, 4
    *     list.length = 3;
    *     print(range.join(', '));  // => 2, 3
    */
   Iterable<E> getRange(int start, int end);
 
   /**
-   * Copies [length] elements of [from], starting
-   * at [startFrom], into the list, starting at [start].
-   * If [length] is 0, this method does not do anything.
-   * Throws an [ArgumentError] if [length] is negative.
-   * Throws an [RangeError] if [start] or
-   * [:start + length - 1:] are out of range for [:this:], or if
-   * [startFrom] or [:startFrom + length - 1:] are out of range for [from].
+   * Copies the elements of [iterable], skipping the [skipCount] first elements
+   * into the range [start] - [end] of `this`.
+   *
+   * If [start] equals [end] and represent a legal range, this method has
+   * no effect.
+   *
+   * It is an error if [start]..[end] is not a valid range pointing into the
+   * `this`.
+   *
+   * It is an error if the [iterable] does not have enough elements after
+   * skipping [skipCount] elements.
    */
-  void setRange(int start, int length, List<E> from, [int startFrom]);
+  void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]);
 
   /**
    * Removes [length] elements from the list, beginning at [start].
    * Throws an [UnsupportedError] if the list is
    * not extendable.
    * If [length] is 0, this method does not do anything.
    * Throws an [ArgumentError] if [length] is negative.
    * Throws an [RangeError] if [start] or
    * [:start + length: - 1] are out of range.
    */
@@ skipping 14 matching lines @@
   void insertRange(int start, int length, [E fill]);
 
   /**
    * Returns an unmodifiable [Map] view of `this`.
    *
    * It has the indices of this list as keys, and the corresponding elements
    * as values.
    */
   Map<int, E> asMap();
 }