https://github.com/Andarist/callbag-loop

👜 Callbag operator that accumulates results using a feedback loop that emits one value and feeds back another to be used in the next iteration.
https://github.com/Andarist/callbag-loop

callbag callbags

Last synced: 16 days ago
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👜 Callbag operator that accumulates results using a feedback loop that emits one value and feeds back another to be used in the next iteration.

• Host: GitHub
• URL: https://github.com/Andarist/callbag-loop
• Owner: Andarist
• Created: 2018-05-04T08:44:55.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-11-07T22:19:43.000Z (about 6 years ago)
• Last Synced: 2024-10-20T06:22:55.886Z (22 days ago)
• Topics: callbag, callbags
• Language: JavaScript
• Homepage:
• Size: 3.91 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-callbags - loop

README

        
# callbag-loop

Callbag operator that accumulates results using a feedback loop that emits one value and feeds back another to be used in the next iteration.

It allows you to maintain and update a “state” (a.k.a. feedback, a.k.a. seed for the next iteration) while emitting a different value. In contrast, [scan](https://github.com/staltz/callbag-scan) feeds back and produces the same value.

Inspired by [most.js's loop](https://mostcore.readthedocs.io/en/latest/api.html#loop).

## Example

```js

import forEach from 'callbag-for-each'

import fromIter from 'callbag-from-iter'

import loop from 'callbag-loop'

import pipe from 'callbag-pipe'

const add = (a, b) => a + b

const average = values => values.reduce(add, 0) / values.length

pipe(

  fromIter([10, 20, 60, 20, 5, 150, 3, 80]),

  loop((seed, value) => {

    seed.push(value)

    seed = seed.slice(-4)

    return [seed, average(seed)]

  }, []),

  forEach(avg => {

    // will log 10, 15, 30, 27.5, 26.25, 58.75, 44.5, 59.5

    console.log(avg)

  }),

)

```