Implement List.getRange.

runtime/lib/growable_array.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.
 
 class GrowableObjectArray<T> implements Array<T> {
   Array<T> backingArray;
 
   void copyFrom(Array<Object> src, int srcStart, int dstStart, int count) {
     Arrays.copy(src, srcStart, this, dstStart, count);
   }
@@ skipping 24 matching lines @@
                 start,
                 this.length - length - start);
     this.length = this.length - length;
   }
 
   void insertRange(int start, int length, [T initialValue = null]) {
     throw const NotImplementedException();
   }
 
   List<T> getRange(int start, int length) {
-    throw const NotImplementedException();
+    if (length == 0) return [];
+    Arrays.rangeCheck(this, start, length);
+    return new List<T>.fromList(this, start, start + length);
   }
 
   // The length of this growable array. It is always less than the
   // length of the backing array.
   int _length;
   // Constant used by indexOf and lastIndexOf when the element given
   // is not in the array.
   static final int ABSENT = -1;
 
   GrowableObjectArray()
@@ skipping 153 matching lines @@
     if (!hasNext()) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final GrowableObjectArray<T> _array;
   int _pos;
 }