Add min and max to Iterable and Stream.

sdk/lib/_internal/compiler/implementation/tree/nodes.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 tree;
 
 abstract class Visitor<R> {
   const Visitor();
 
   R visitNode(Node node);
@@ skipping 523 matching lines @@
   }
 
   Node get last {
     return Collections.last(this);
   }
 
   Node get single {
     return Collections.single(this);
   }
 
+  Node min([int compare(Node a, Node b)]) => Collections.min(this, compare);
+
+  Node max([int compare(Node a, Node b)]) => Collections.max(this, compare);
+
   Node firstMatching(bool test(Node value), {Node orElse()}) {
     return Collections.firstMatching(this, test, orElse);
   }
 
   Node lastMatching(bool test(Node value), {Node orElse()}) {
     return Collections.lastMatching(this, test, orElse);
   }
 
   Node singleMatching(bool test(Node value)) {
     return Collections.singleMatching(this, test);
@@ skipping 1531 matching lines @@
  * argument).
  *
  * TODO(ahe): This method is controversial, the team needs to discuss
  * if top-level methods are acceptable and what naming conventions to
  * use.
  */
 initializerDo(Node node, f(Node node)) {
   SendSet send = node.asSendSet();
   if (send != null) return f(send.arguments.head);
 }