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On a fateful day back in 2013, Promises were adopted by TC39 as a standard for asynchronous programming in JavaScript, much to the delight of web programmers, but to the chagrin of Node.js developers. This approach has a few downsides such as the non-inclusion of things such as cancellation into the base specification.

Instead, we'll look at Observables as a solution to this problem which will not only fix the asynchronous problem, but also the event-based and other systems, all with the ability to cancel and have deterministic cleanup.