Make first and last getters.

utils/lib/file_system.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.
 
 // TODO(terry): Investigate common library for file I/O shared between frog and tools.
 
 /** Abstraction for file systems and utility functions to manipulate paths. */
 #library('file_system');
 
 /**
@@ skipping 19 matching lines @@
   return path.replaceAll('\\', '/');
 }
 
 /** Join [path1] to [path2]. */
 String joinPaths(String path1, String path2) {
   path1 = canonicalizePath(path1);
   path2 = canonicalizePath(path2);
 
   var pieces = path1.split('/');
   for (var piece in path2.split('/')) {
-    if (piece == '..' && pieces.length > 0 && pieces.last() != '.'
-      && pieces.last() != '..') {
+    if (piece == '..' && pieces.length > 0 && pieces.last != '.'
+      && pieces.last != '..') {
       pieces.removeLast();
     } else if (piece != '') {
-      if (pieces.length > 0 && pieces.last() == '.') {
+      if (pieces.length > 0 && pieces.last == '.') {
         pieces.removeLast();
       }
       pieces.add(piece);
     }
   }
   return Strings.join(pieces, '/');
 }
 
 /** Returns the directory name for the [path]. */
 String dirname(String path) {
@@ skipping 11 matching lines @@
 String basename(String path) {
   path = canonicalizePath(path);
 
   int lastSlash = path.lastIndexOf('/', path.length);
   if (lastSlash == -1) {
     return path;
   } else {
     return path.substring(lastSlash + 1);
   }
 }