Reapply "Make Map constructors return LinkedHashMap."

sdk/lib/collection/iterable.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.collection;
 
 /**
  * This [Iterable] mixin implements all [Iterable] members except `iterator`.
  *
  * All other methods are implemented in terms of `iterator`.
@@ skipping 36 matching lines @@
     return value;
   }
 
   bool every(bool f(E element)) {
     for (E element in this) {
       if (!f(element)) return false;
     }
     return true;
   }
 
-  String join([String separator]) {
+  String join([String separator = ""]) {
     Iterator<E> iterator = this.iterator;
     if (!iterator.moveNext()) return "";
     StringBuffer buffer = new StringBuffer();
     if (separator == null || separator == "") {
       do {
         buffer.write("${iterator.current}");
       } while (iterator.moveNext());
     } else {
       buffer.write("${iterator.current}");
       while (iterator.moveNext()) {
@@ skipping 170 matching lines @@
     return value;
   }
 
   bool every(bool f(E element)) {
     for (E element in this) {
       if (!f(element)) return false;
     }
     return true;
   }
 
-  String join([String separator]) {
+  String join([String separator = ""]) {
     Iterator<E> iterator = this.iterator;
     if (!iterator.moveNext()) return "";
     StringBuffer buffer = new StringBuffer();
     if (separator == null || separator == "") {
       do {
         buffer.write("${iterator.current}");
       } while (iterator.moveNext());
     } else {
       buffer.write("${iterator.current}");
       while (iterator.moveNext()) {
@@ skipping 114 matching lines @@
   E elementAt(int index) {
     if (index is! int || index < 0) throw new RangeError.value(index);
     int remaining = index;
     for (E element in this) {
       if (remaining == 0) return element;
       remaining--;
     }
     throw new RangeError.value(index);
   }
 }