Différence (à partir des dernières versions mineure)
http://www.dartlang.org
http://code.google.com/p/dart
http://googlecode.blogspot.fr/2011/10/dart-language-for-structured-web.html
http://en.wikipedia.org/wiki/Dart_(programming_language)
http://www.theregister.co.uk/2014/01/17/dart_1_1_matches_javascript
http://www.infoworld.com/article/2692272/javascript/google-dart-crashes-into-top-20-programming-languages.html
http://www.infoworld.com/article/3136109/application-development/darts-not-dead-google-retools-javascript-challenger.html