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

samples/third_party/dromaeo/Suites.dart

 library Suites;
 
 class Origin {
   final String author;
   final String url;
 
   const Origin(this.author, this.url);
 }
 
 class SuiteDescription {
@@ skipping 74 matching lines @@
         return path.replaceFirst('.html', '$lib.html');
       case 'frog':
       case 'dart2js':
         return '$platform/${path.replaceFirst(".html", "$lib-js.html")}';
     }
   }
 
   static var _SUITE_DESCRIPTIONS;
 
   static List<SuiteDescription> get SUITE_DESCRIPTIONS {
-    if (null !== _SUITE_DESCRIPTIONS) {
+    if (_SUITE_DESCRIPTIONS != null) {
       return _SUITE_DESCRIPTIONS;
     }
     _SUITE_DESCRIPTIONS = <SuiteDescription>[];
 
     // Expand the list to include a unique SuiteDescription for each
     // tested variant.
     for (SuiteDescription suite in _CORE_SUITE_DESCRIPTIONS) {
       List variants = suite.testVariants;
       for (List variant in variants) {
         assert(variant.length == 2);
         String platform = variant[0];
         List<String> libraries = variant[1];
         for(String lib in libraries) {
           String path = _getHtmlPathForVariant(platform, lib, suite.file);
           final combined = new List.from(suite.tags);
           combined.add(platform);
           if (lib != '') {
             combined.add(lib);
             lib = ':$lib';
           }
-          final name = null === variant
+          final name = (variant == null)
               ? suite.name
               : '${suite.name} ($platform$lib)';
           _SUITE_DESCRIPTIONS.add(new SuiteDescription(
                                       path,
                                       name,
                                       suite.origin,
                                       suite.description,
                                       combined,
                                       []));
         }
@@ skipping 31 matching lines @@
       return CATEGORIES[tags];
     }
     for (final suite in _CORE_SUITE_DESCRIPTIONS) {
       if (suite.tags[0] == tags) {
         return suite.name;
       }
     }
     return null;
   }
 }