a === b -> identical(a, b)

tools/testing/dart/drt_updater.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.
 
 #library("drt_updater");
 
 #import("dart:io");
 
 #import("test_suite.dart");
 
@@ skipping 21 matching lines @@
         return false;
       });
       _updatingProcess.then(_onUpdatedHandler);
     }
   }
 
   List<String> get _getUpdateCommand {
     Path testScriptPath = new Path.fromNative(TestUtils.testScriptPath);
     Path updateScriptPath = testScriptPath.directoryPath.append(script);
     List<String> command = [updateScriptPath.toNativePath()];
-    if (null !== option) {
+    if (null != option) {
       command.add(option);
     }
     return command;
   }
 
   void _onUpdatedHandler(ProcessResult result) {
     if (result.exitCode == 0) {
       print('$name updated');
     } else {
       print('Failure updating $name');
       print('  Exit code: ${result.exitCode}');
       print(result.stdout);
       print(result.stderr);
       exit(1);
     }
     for (var callback in onUpdated ) callback();
   }
 }
 
 _DartiumUpdater _dumpRenderTreeUpdater;
 _DartiumUpdater _dartiumUpdater;
 
 _DartiumUpdater runtimeUpdater(Map configuration) {
   String runtime = configuration['runtime'];
   if (runtime == 'drt' && configuration['drt'] == '') {
     // Download the default DumpRenderTree from Google Storage.
-    if (_dumpRenderTreeUpdater === null) {
+    if (_dumpRenderTreeUpdater == null) {
       _dumpRenderTreeUpdater = new _DartiumUpdater('DumpRenderTree',
                                                    'get_archive.py', 'drt');
     }
     return _dumpRenderTreeUpdater;
   } else if (runtime == 'dartium' && configuration['dartium'] == '') {
     // Download the default Dartium from Google Storage.
-    if (_dartiumUpdater === null) {
+    if (_dartiumUpdater == null) {
       _dartiumUpdater = new _DartiumUpdater('Dartium Chrome', 'get_archive.py',
                                             'dartium');
     }
     return _dartiumUpdater;
   } else {
     return null;
   }
 }