Deferred objects simplify callback management in an asynchronous environment, mitigating the "Pyramid of Doom" that results from too many levels of nested callbacks.
Deferred objects simplify callback management in an asynchronous environment, mitigating the "Pyramid of Doom" that results from too many levels of nested callbacks. A deferred object exposes a promise as interface but internally keeps a system for changing the status of the promise.
Example libraries:
jQuery: http://api.jquery.com/jQuery.Deferred/
Node.js / Vanilla JS: https://github.com/kriskowal/q
