I think Dart is sort of like CoffeeScript in that it was an experiment and influenced a lot of JavaScript standards people.A lot of the features of CoffeeScript are being integrated into JS with ES6 and ES7. The same is actually happening to the unique features of Dart such as typing and SIMD and better modules. Typing is so cool: http://wiki.ecmascript.org/doku.php?id=harmony:typed_objects SIMD i