async.js

Firefox has had this for over 6 years through my async.js[1] library that relied in JavaScript 1.7's pythonic iterators and generators. The syntax is similar, as you have to mark/encapsulate functions with async() to use the library. 1. https://github.com/eligrey/async.js

I made a library called async.js (https://github.com/eligrey/async.js) that makes it even easier to abstract away all callbacks with yields, so all you'd have to do is yield to.sleep(5); continueFun(); for your example. More complex things are also easy to do as well, such as implementing a node.next(event) method, so you can simply do var click = yield document.next("click"); instead of the whole event listener shebang. The feedback example (https://github.com/eligrey/async.js#asking-the-user-for-thei...) shows how much of a difference using yield can be versus callbacks or even promises.

Another library that tries to make async code much cleaner is async.js (https://github.com/eligrey/async.js#readme). It uses yield and generators to abstract away the callback jungle. For example, you can easily condense tens of lines of event code into a single `event = yield document.next("click")`

https://github.com/caolan/async: 3293 stars on Github https://github.com/eligrey/async.js: 15 stars on Github Sorry, you lost this one.

One way to escape callback hell is to use a async.js (https://github.com/eligrey/async.js), which uses yield to abstract away callbacks. It's Firefox-only (JS 1.7+) though, but that can probably be resolved by using a JS parser and replacing every yield with JS 1.5 callbacks. Full disclosure: I wrote async.js.

You can actually combine generators with pseudo-deferred functions today in normal JavaScript 1.7+. For example, see async.js (https://github.com/eligrey/async.js). Disclaimer: I wrote the library.

There's a JavaScript library called async.js (http://github.com/eligrey/async.js) that does that exact same thing (pseudo-asynchronosity using the yield statement in decorated functions).