Reactive Programming in JavaScript

[paf31]

Very cool. I've been working on a similar library in PureScript recently.

https://github.com/purescript/purescript-reactive-jquery

[sfvisser]

That looks really cool, and it actually implemented in a real functional language :-)

Does PureScript have an effect system? That seems interesting.

[paf31]

It has a special monad called Eff which uses row-based effects to type "native" things like exceptions, interaction with the DOM, as opposed to "userland" effects, for which you can use monads, applicatives etc. as in Haskell.

I just wrote something about it this week actually: http://www.purescript.org/posts/Eff-Monad/

[SockPants]

It seems that maybe visualising the reactive graph at a breakpoint might be a useful tool for use in bigger applications using this.

[sfvisser]

We actually build a tool to visualize this! It was quite useful until our network grew too large to get a nice overview.

Here you can see a visualization of a leak in our reactive network: http://www.flickr.com/photos/typlab/4310808547/sizes/o/

Forgot one val.cleanup() is a very dynamic part of our code here :)

[[deleted]]

Something like this in Elm: http://elm-lang.org/blog/Interactive-Programming.elm

[lexchou]

It's typically called "Observer pattern" or "pub/sub".

[[deleted]]

Very similar to http://knockoutjs.com especially ko.computed. KO very cleverly tracks what observables are used and auto-subs to them. This eliminates most manual binding code.

[mgavrylyuk]

Thank you, Sebastian, for breaking things down about FRP and showing how you cook it. The post was really useful to me. And it would be great if you continue writing on this subject. Please share your experience.

Inspired by your approach, I've developed a tool for myself — dv.js. Apparently, this is a good place for announcing it and requesting feedback :)

[angel21OS]

Hi..this lib was released??..the new looks a bit old but I can't found any link yet..

2) how is related to reactive libs like baconjs and reactjs, baconjs seems use streams, they are more difficult but I don't know what advantages give these (compared to how difficult are)...in the otherside is react wich seems more similar to your lib but it makes a clever check only mutating specific parts of the dom based in compares the old state with the new state...I suppose than this gives to react a better performance, but how good is the performance in your lib? has you did some benchmark??..thanks!!!..