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Questions tagged [bacon.js]

A small functional reactive programming library for JavaScript.

198 questions
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FRP complex state - immutability vs performance

My question is about mutability of 'state machine' object in FRP. I'm evaluating Bacon.js's Observable.withStateMachine. My domain is trading robots. I've got a source event stream of 'Orders' which actually are tuples (buy or sell,price,volume) I…
user2732200
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Convert async.waterfall to Bacon

I'm trying to integrate Baconjs into my current Nodejs project, in this project I used Async https://github.com/caolan/async to handle callbacks. One of the methods is async.waterfall that is now I want to port it to Bacon, using…
dee
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How do I prevent event cycles with FRP (and bacon.js)

I've managed to create a cycle in my bacon-powered application, so I need some advice on how to break it. Let's say we have several properties which carry some state of the application. This state is supposed to be stored via HTML5 History API…
Nikolai Prokoschenko
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How can I express the initial processes by Bacon.js in place of Promise?

I alway do something like this for initial processes: $.when(dom(), webrtc(), websocket('wss://example.com/'), sleep(3000)).then(load, fail); dom, webrtc, websocket, and sleep are Promise objects. This expression is useful to load some parallel…
Japboy
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Why does a Bacon.combineAsArray Stream of 'keyup' events immediately end?

I need to create a Bacon.Property that gets either true or false if multiple html input contain their correct char. (They all have to be correct, if not, the property needs to be false) To achieve this, I created an Array of eventStreams via…
jukempff
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bacon.js EventStream representing polling of url at interval

I want to poll a url regularly and get the results as a stream. I'm probably missing something obvious but does anyone know how to do this seemingly simple thing in bacon.js?
Kaleidoscope
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Bacon.js, delay each value in the stream by 1 second

I have this: var bulk = array[1,2,3,4] var finalResult = Bacon .fromArray(bulk) .flatMap(isValInCouchDb) .filter(onesThatExist) .flatMap(putValInCouchDb) I need right after the filter to delay the whole stream by 1 second and then…
haknick
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How do I delay a Bacon.js stream until a value on another stream?

Given two Bacon.Buses I need to combine their respective values. However, the second bus is vastly more "productive" (about 1:200), the first bus is also slower and its first value is severely delayed, e.g. fetched via XHR or something similar.…
Nikolai Prokoschenko
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How can I combine a current value of a stream with each value of another stream in bacon.js?

In my application I have a state object state, which is mutated by GUI elements. Each time this state is mutated, an XHR is executed to update the state server-side and current state is returned. This maps nicely to Bacon.js' streams. Now, assuming…
Nikolai Prokoschenko
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List in a Container with Bacon.js

I have a list of elements and a container for the list. (They are implemented with Marionette + Backbone views). What I'd like to do is register a click on the list and send it to the container with bacon.js or something similar. This is fairly easy…
Archaeron
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Bacon.js onValue() chain

Why the construction like $("#clickme").asEventStream('click').onValue(callback1).onValue(callback2); doesn't work, but this one var promise = $("#clickme").asEventStream('click'); promise.onValue(callback1); promise.onValue(callback2); works.…
speedingdeer
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How do I get the status of an Ajax call in Bacon.js?

jQuery's Ajax handler returns an array of arguments when its promise resolves, and the initial tuple is ([data], "status"). I've found that when I use Bacon.fromPromise, all I get back is the data. How would I get the status of the transaction,…
Elf Sternberg
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Control flow in bacon.js, how to do something at a given time

So I'm fairly new to the functional programming paradigm and especially new to Bacon.js and FRP. I need some advice on how to conceptualize control flow in FRP. I have a timer in an event stream that counts down to zero. When it has reached zero I…
droidballoon
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Is it possible to throttle the bacon action `repeatedly` somehow?

I am using bacon.js and have some situation where signal is emitted from two sources: sourceA :: EventStream a sourceB :: EventStream Bool When sourceA is fired, it should trigger some action that runs repeatedly onto perpetuity, except when a…
xiaolingxiao
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combineWith vs onValues in Bacon.js

I have 2 Bacon.jQuery Models (but the problem can be illustrated with any Bacon Observable). I have 3 combo boxes: foo, bar and quux. bar depends on foo and quux depends on a combination of bar and quux. There is a findQuux function which finds a…
nponeccop
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