1) postfix conditionals 2) list comprehensions (will probably be in ES7) 3) the .litcoffee format 4) use of -> or => for defining functions unbound/bound to `this` 5) python-escue whitespace (i love it) 6) array slicing (some_array[3 .. 8]) 7) regular expresions defined on several lines (expanded for readability) 8) friendly "item in some_array" that translates to .indexOf() condition 9) @value becomes this.value 10) The existential operator? is awesome. 11) () -> a = 1 b = 2 return { a, b } # becomes: { a: a, b: b }

There are others... I very much enjoy the syntax coffeescript has for its for loops. for value in some_array for value, key in some_array for key of some_object for key, value of some_object for own key of some_object for own key, value of some_object # for-of uses Object.hasOwnProperty()

Coffeescript just needs a for loop form that works with iterators, then I will be happier. I can write in Coffeescript and distribute both that and the compiled JS, no problem. This feels comfortable to me. I hope was ES6 becomes common that Coffeescript's class syntax will "fall through" to the same ES6 way underneath.