> Nested callbacks is so backwards its like writing in assembly. Only people whose first exposure to asynchronous programming was Node think it's a valid progra

> Nested callbacks is so backwards its like writing in assembly. Only people whose first exposure to asynchronous programming was Node think it's a valid programming style. It depends on precisely what structures you include in your definition of "nested callbacks" here. I think that the callback and errback chains on the Deferred object in Twisted is basically the perfect abstraction for the flow control they represent.