You don't have to emulate functions in Dart. Dart has first class closures: adder(x) => (y) => x + y; You can also make you objects act like functions, i.e. b

You don't have to emulate functions in Dart. Dart has first class closures: adder(x) => (y) => x + y; You can also make you objects act like functions, i.e. be callable via obj(...). Which is a completely different thing (and you can't do that in JavaScript, only functions are callable).