asyncgenerator

What you're looking for is Async Generators [0]. They were in traceur master not too long ago, but I'm not sure if they have been pulled out ([0] indicates that the proposal was pulled and replaced with the lesser Observable). [0] https://github.com/jhusain/asyncgenerator

OK, I'll shoot: Why not Promises? They don't handle streaming data, but they're not supposed to; they're supposed to model the traditional JS function call model (single value return or single value exception) which they do well. For streaming data use some other paradigm (perhaps Observables from https://github.com/jhusain/asyncgenerator), but that's orthogonal to Promises, not a replacement for them. The only other reasonable complaint I've heard is that they aren't cancellable, which is legit. There are proposals for that, though (https://github.com/petkaantonov/bluebird/blob/master/API.md#...). At least with Promises functions actually return, as opposed to the continuation-passing-style of callbacks. (CPS is a fine intermediate representation for compilers, but it really shouldn't be written by hand; that's why we have compilers!