>As much as people talk about "callback hell," it's never clear to me what problems they actually think they're having. It seems that as often as not, it's just

>As much as people talk about "callback hell," it's never clear to me what problems they actually think they're having. It seems that as often as not, it's just a visceral dislike of indentation. It's surprisingly hard to articulate the problems. It's one of those things that you can experience but hard to explain. I tried to explain it[1] by going through the example of implement a vending machine[2] in various concurrency patterns in JS. Starting with callbacks and ending with async/await. I still don't think I did a great job. [1] http://amasad.me/2015/10/31/javascript-async-functions-for-easier-concurrent-programming/ http://amasad.me/2015/10/31/javascript-async-functions-for-e... [2]: The vending machine example is inspired Tony Hoare's examples in the CSP book http://lass.cs.umass.edu/~shenoy/courses/summer04/readings/Hoare.pdf http://lass.cs.umass.edu/~shenoy/courses/summer04/readings/H...