https://github.com/staltz/callbag-share

👜 Callbag operator that broadcasts a single source to multiple sinks
https://github.com/staltz/callbag-share

Last synced: 28 days ago
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👜 Callbag operator that broadcasts a single source to multiple sinks

• Host: GitHub
• URL: https://github.com/staltz/callbag-share
• Owner: staltz
• License: mit
• Created: 2018-01-29T10:55:07.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2021-01-26T18:34:53.000Z (almost 4 years ago)
• Last Synced: 2024-10-10T00:50:02.432Z (about 1 month ago)
• Language: JavaScript
• Homepage:
• Size: 13.7 KB
• Stars: 22
• Watchers: 3
• Forks: 3
• Open Issues: 2
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-callbags - share

README

        
# callbag-share

Callbag operator that broadcasts a single source to multiple sinks. Does reference counting on sinks and starts the source when the first sink gets connected, similar to RxJS [`.share()`](https://www.learnrxjs.io/operators/multicasting/share.html). Works on either pullable or listenable sources.

`npm install callbag-share`

## example

Share a listenable source to two listeners:

```js

const interval = require('callbag-interval');

const observe = require('callbag-observe');

const share = require('callbag-share');

const source = share(interval(1000));

observe(x => console.log(x))(source); // 0

                                      // 1

                                      // 2

                                      // 3

                                      // ...

setTimeout(() => {

  observe(x => console.log(x))(source); // 3

                                        // 4

                                        // 5

                                        // ...

}, 3500);

```

Share a pullable source to two pullers:

```js

const fromIter = require('callbag-from-iter');

const share = require('callbag-share');

const source = share(fromIter([10,20,30,40,50]));

let talkback;

source(0, (type, data) => {

  if (type === 0) talkback = data;

  else console.log('a' + data);

});

source(0, (type, data) => {

  if (type === 1) console.log('b' + data);

});

talkback(1); // a10

             // b10

talkback(1); // a20

             // b20

```