[s4vi0r]

What you want is a monad.

Instead of loading up every language with stupid keywords that are meant to simplify monadic code (but only for one domain), language designers should really take a page out of Haskell or Scala's book and think seriously about unifying on a do notation/for comprehension type construct.

That way regardless of if you're working with promises or not, you don't have to worry about hacking it with && or nesting 10 layers deep with if/else.