List.mappedBy/skip/take returns a List.

sdk/lib/collection_dev/list.dart

 // Copyright (c) 2013, 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.collection.dev;
 
 /**
  * Class implementing the read-operations on [List].
  *
  * Implements all read-only operations, except [:operator[]:] and [:length:],
  * in terms of those two operations.
  */
-abstract class ListBase<E> extends Iterable<E> implements List<E> {
+abstract class ListBase<E> extends Collection<E> implements List<E> {
   Iterator<E> get iterator => new ListIterator(this);
 
   void forEach(f(E element)) {
     for (int i = 0; i < this.length; i++) f(this[i]);
   }
 
   bool contains(E value) {
     for (int i = 0; i < length; i++) {
       if (this[i] == value) return true;
     }
@@ skipping 62 matching lines @@
   }
 
   List<E> getRange(int start, int length) {
     List<E> result = <E>[];
     for (int i = 0; i < length; i++) {
       result.add(this[start + i]);
     }
     return result;
   }
 
+  List mappedBy(f(E element)) {
+    return new MappedList(this, f);
+  }
+
+  List<E> take(int n) {
+    return new ListView(this, 0, n);
+  }
+
+  List<E> skip(int n) {
+    return new ListView(this, n, null);
+  }
+
   String toString() => Collections.collectionToString(this);
 }
 
 /**
  * Abstract class implementing the non-length changing operations of [List].
  */
 abstract class FixedLengthListBase<E> extends ListBase<E> {
   void operator[]=(int index, E value);
 
   List<E> get reversed => new ReversedListView<E>(this, 0, null);
@@ skipping 412 matching lines @@
       throw new ConcurrentModificationError(list);
     }
     if (_index <= _start) return false;
     _index -= 1;
     _current = _list[_index];
     return true;
   }
 
   E get current => _current;
 }