News for hackers. Stuff that matters.

A comment on Cancelable Promises: Why was this proposal withdrawn?. Parent comment

Re:Cancelable Promises: Why was this proposal withdrawn? by naasking on Monday December 19, 2016 @10:17AM (#13211887)
From the FRP literature, an observable can be viewed as a stream of promises, something like:

    { "value" : ..., "next" : new Promise(...) }
So it's basically a linked list of the current value, and the next value which is a promise for the same type of structure.
[ Parent | on HN ]
Re:Cancelable Promises: Why was this proposal withdrawn? by bad_user on Monday December 19, 2016 @02:49PM (#13214444)
An observable is definitely not a stream of promises, because an observable is push-based, while a stream of promises would be pull-based.

Big difference in performance, implementation and what operations are possible or not. Even if you add back-pressure in that protocol, it's still a big difference.

And yes, my point is that an observable is close to being a sort of superset of a promise, but not close enough.

[ Parent | on HN ]
Re:Cancelable Promises: Why was this proposal withdrawn? by naasking on Monday December 19, 2016 @04:36PM (#13215179)
> An observable is definitely not a stream of promises, because an observable is push-based, while a stream of promises would be pull-based.

Why would a stream of promises be pull-based? That seems like a pretty odd assumption to me.

[ Parent | on HN ]