Big merge from experimental to bleeding edge.

sdk/lib/html/html_common/lists.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.
 
 part of html_common;
 
 class Lists {
 
   /**
    * Returns the index in the array [a] of the given [element], starting
@@ skipping 48 matching lines @@
   static List getRange(List a, int start, int length, List accumulator) {
     if (length < 0) throw new ArgumentError('length');
     if (start < 0) throw new RangeError.value(start);
     int end = start + length;
     if (end > a.length) throw new RangeError.value(end);
     for (int i = start; i < end; i++) {
       accumulator.add(a[i]);
     }
     return accumulator;
   }
+
+  static String join(List<Object> list, [String separator]) {
+    if (list.isEmpty) return "";
+    if (list.length == 1) return "${list[0]}";
+    StringBuffer buffer = new StringBuffer();
+    if (separator == null || separator == "") {
+      for (int i = 0; i < list.length; i++) {
+        buffer.add("${list[i]}");
+      }
+    } else {
+      buffer.add("${list[0]}");
+      for (int i = 1; i < list.length; i++) {
+        buffer.add(separator);
+        buffer.add("${list[i]}");
+      }
+    }
+    return buffer.toString();
+  }
 }