On the opposite side , with a little bit of "header" writing ( or none but you lose type safety ) , Haxe support direct use of javascript libraries , that's what makes Haxe better than dart in my opinion, and you can reuse all the code that is not tied to the DOM is C++,Neko,Java and Flash apps (and android + iphone + ... with the NME framework ). But Dart optional type system is still interesting.