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

sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.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 js_backend;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 87 matching lines @@
   String get defineNativeClassFunction {
     return """
 function(cls, desc) {
   var fields = desc[''] || [];
   var generateGetterSetter = ${emitter.generateGetterSetterFunction};
   for (var i = 0; i < fields.length; i++) {
     generateGetterSetter(fields[i], desc);
   }
   var hasOwnProperty = Object.prototype.hasOwnProperty;
   for (var method in desc) {
-    if (method !== '') {
+    if (method != '') {

[Lasse Reichstein Nielsen, 2012/11/12 13:10:41]

.isEmpty.

[floitsch, 2012/11/12 22:18:43]

Actually inside a string (thus JavaScript code). Reverting this change.

       if (hasOwnProperty.call(desc, method)) {
         $dynamicName(method)[cls] = desc[method];
       }
     }
   }
 }""";
   }
 
   void generateNativeLiteral(ClassElement classElement) {
     String quotedNative = classElement.nativeName.slowToString();
@@ skipping 356 matching lines @@
         if (!first) targetBuffer.add(",\n");
         targetBuffer.add(" $name: $function");
         first = false;
       });
       targetBuffer.add("\n});\n\n");
     }
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }