Monad explained using Javascript

(...)Translation from Haskell to JavaScript of selected portions of the best introduction to monads I’ve ever read(...)
http://blog.jcoglan.com/2011/03/05/translation-from-haskell-to-javascript-of-selected-portions-of-the-best-introduction-to-monads-ive-ever-read/
http://blog.jcoglan.com/2011/03/11/promises-are-the-monad-of-asynchronous-programming/