In this vein, it's also worth looking at Microsoft's "Reactive Extensions" (which have a JS implementation, too.) It's a similarly monadic approach to asynchron

In this vein, it's also worth looking at Microsoft's "Reactive Extensions" (which have a JS implementation, too.) It's a similarly monadic approach to asynchrony, but deals in "observables" which produce zero or more events, compared to promises which produce only one. (Edit: corrected "one or more" to "zero or more".)