Add optional arguments to our indexOf/lastIndexOf methods.

corelib/src/string.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.
 
 /**
  * The String class represents character strings. Strings are
  * immutable. A string is represented by a list of 32-bit Unicode
  * scalar character codes accessible through the [charCodeAt] or the
  * [charCodes] method.
  */
@@ skipping 29 matching lines @@
    */
   bool endsWith(String other);
 
   /**
    * Returns whether this string starts with [other].
    */
   bool startsWith(String other);
 
   /**
    * Returns the first location of [other] in this string starting at
-   * [startIndex] (inclusive).
+   * [start] (inclusive).
    * Returns -1 if [other] could not be found.
    */
-  int indexOf(String other, int startIndex);
+  int indexOf(String other, [int start]);
 
   /**
    * Returns the last location of [other] in this string, searching
-   * backward starting at [fromIndex] (inclusive).
+   * backward starting at [start] (inclusive).
    * Returns -1 if [other] could not be found.
    */
-  int lastIndexOf(String other, int fromIndex);
+  int lastIndexOf(String other, [int start]);
 
   /**
    * Returns whether this string is empty.
    */
   bool isEmpty();
 
   /**
    * Creates a new string by concatenating this string with [other].
    */
   String concat(String other);
@@ skipping 14 matching lines @@
    * Returns a new string where leading and trailing whitespaces of
    * this string have been removed, or returns this string if it does
    * not have leading and trailing whitespaces.
    */
   String trim();
 
   /**
    * Returns whether this string contains [other] starting
    * at [startIndex] (inclusive).
    */
-  bool contains(Pattern other, int startIndex);
+  bool contains(Pattern other, [int startIndex]);
 
   /**
    * Returns a new string where the first occurence of [from] in this string
    * is replaced with [to].
    */
   String replaceFirst(Pattern from, String to);
 
   /**
    * Returns a new string where all occurences of [from] in this string
    * are replaced with [to].
@@ skipping 21 matching lines @@
    * where all characters  are made lower case. Returns [:this:] otherwise.
    */
   String toLowerCase();
 
   /**
    * If this string is not already all uper case, returns a new string
    * where all characters are made upper case. Returns [:this:] otherwise.
    */
   String toUpperCase();
 }