bacon.js | Functional reactive programming library for TypeScript | Functional Programming library
kandi X-RAY | bacon.js Summary
kandi X-RAY | bacon.js Summary
. A functional reactive programming lib for TypeScript JavaScript, written in TypeScript. Turns your event spaghetti into clean and declarative feng shui bacon, by switching from imperative to functional. It’s like replacing nested for-loops with functional programming concepts like [map] and [filter] Stop working on individual events and work with event streams instead. Combine your data with [merge] and [combine] Then switch to the heavier weapons and wield [flatMap] and [combineTemplate] like a boss.
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Community Discussions
Trending Discussions on bacon.js
QUESTION
I'm trying to get use of atomic updates Bacon.js offers so have to rewrite Rx.JS code at some places of my app to Bacon.js, but can't figure out yet how can I implement withLatestFrom() with Bacon.js?
In such a way that, for example, when user clicks, some code executes with latest value from $serverResponses
stream, but when server responses, that code (click handler) should not execute.
Thanks in advance :)
...ANSWER
Answered 2017-Sep-25 at 05:57Try sampledBy. It has inverse argument ordering compared to withLatestFrom, but does the same thing.
QUESTION
I am trying to figure it out if there is a function in the Bacon.js API that allows to subscribe to an EventStream and when the first event fires up, the handle is unsubscribed. The way to do it that I know is the following:
...ANSWER
Answered 2017-Jul-19 at 18:05How about stream.take(1)? https://baconjs.github.io/api.html#observable-take
Or stream.first()? https://baconjs.github.io/api.html#observable-first
QUESTION
I'm fairly new to reactive programming, and I'm starting to play with kefirjs. On the face of it, it looks like bacon/kefir's event streams and properties are essentially a way to express a dependency/computation dag that varies with time, and there are neat ways to hook up these dags to DOM events and UIs. Ok, sounds good.
I know that in general, when you have a computation dag, if you change the value of a single upstream node and naively push the computation downstream recursively, the well-known problems are:
it takes up to exponential time relative to the number of dag nodes affected
intermediate computations use a mix of the previous and current values of the input node, resulting in strange/inconsistent transient output values.
I see from playing around with some simple toy programs that kefir does such updates naively, so (1.) and (2.) do in fact occur. (I haven't tried bacon.)
Are these not considered to be problems?
For an example, in the following program, I'd expect the output x6 to change directly from 64 to 640, at a cost of 12 combinator evaluations (6 initially, and 6 triggered by the single update). Instead, the output goes 64,73,82,91,...,622,631,640 (63 pointless intermediate values) at a cost of 132 combinator evaluations (6 initially, which makes sense, and then 126 for the update, which is excessive).
...ANSWER
Answered 2017-Jun-12 at 07:54Bacon.js has Atomic Updates (https://github.com/baconjs/bacon.js/#atomic-updates) while Kefir has not. This is why with Bacon.js you'll see your desired behaviour while with Kefir you'll get a lot of intermediate values.
QUESTION
Let's say I have two bacon.js
streams:
ANSWER
Answered 2017-May-29 at 17:38Add a mapping function to get the value out of the event (I think there is a Bacon convience function as well), change you my_filter to a function, and call it with filter in your stream:
QUESTION
I'm been learning how to use JavaScript 'node-style' streams using Bacon.js. Namely, I've been looking at the Bus
EventStreams
.
It all looks very interesting and I'm sure that JavaScript streams have a multitude of great use cases, but I can't seem to think of a single practical application.
Can anyone provide me with some examples of use cases for Streams?
...ANSWER
Answered 2017-Apr-05 at 15:01I used it to handle key events, update values in near real time via Server Side Push/Web socket, and combine with other events to determine a behavior to act upon (ex. if the page has focus when a web socket event fires, update a field..).
Here are a few more...
Determine if user is active on a page -
QUESTION
I'm a noob and new to web-development and i'm overwhelmed with the multitude of languages. I got the basic understanding on whats going on but I still don't know where I am getting stuck.
I have a DS18B20 connected to my Raspberry Pi and I am able to fetch the temperature in the terminal. I am running the WebIOPi successfully as well and able to see the temperature in its default web page under Devices. So I was hoping to create my own web page that would do the exact same thing with other options for future. I got a hold of some tutorials on WebIOPi and i got 4 files. An HTML file, the JavaScript file, the CSS file and a Python file. In my understanding the HTML file contains the logic and links to other things like clickable buttons and backgrounds etc. The CSS file contains the background and maybe text, the JavaScript file contains animation and buttons? Here I get confused. Last but not least the Python file is what runs the code that contains sensor model and libraries. I configured the Webiopi config file with my sensors serial number as mentioned here: http://webiopi.trouch.com/OneWireTemp.html. I am loosely trying to follow this tutorial where I got most parts of the code: http://webiopi.trouch.com/Tutorial_Devices.html.
Now when I log into the webpage from my browser the background is displayed correctly, but nothing else. There is no box or button showing the temperature. Pictures are attached. I was hoping for a button like attached in the picture.
Any guidance or help would be appreciated!
index.html
...ANSWER
Answered 2017-Jan-03 at 08:41I do not know about your specific case, but to me it seems quite obvious that there is nothing to see here. You have been mixing up things quite a bit.
To clarify things
- The HTML contains the logical structure of your website
- the CSS contains the look and feel (design)
- the JavaScript and the Python files contain (UI)-Logic
This is quite coarse and might deviate, but it should suffice as a start and should apply here.
The obvious errors in your code
- The HTML file is incomplete. It should not stop in the middle of the
script
-section, there should be markup defining the buttons you want to display. Currently there is none, hence there is nothing to see (but the HTMl-body, which is added automatically - and since the background color is defined for the body it is displayed) - The JavaScript file does not actually contain JavaScript, but HTML, which is most likely not correct
- At the moment all your JavaScript is located within the script-section of your HTML file. This is fine as long as your are just trying to work it out, but renders a separate JS-file useless at the moment.
All in all your HTML file should look more like this.
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