If you write JavaScript in strict mode the probability of incidentally declaring something as global is pretty much zero. Those mistakes can also be properly li

If you write JavaScript in strict mode the probability of incidentally declaring something as global is pretty much zero. Those mistakes can also be properly linted and warned against - which is not possible for CoffeeScript's implicit declarations. And at least I had real-life situations where CoffeeScript's scoping broke code in very subtly ways.