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

👜 Callbag operator that applies a transformation on data passing through it
https://github.com/staltz/callbag-map

Last synced: 5 days ago
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👜 Callbag operator that applies a transformation on data passing through it

• Host: GitHub
• URL: https://github.com/staltz/callbag-map
• Owner: staltz
• License: mit
• Created: 2018-01-23T21:30:49.000Z (almost 7 years ago)
• Default Branch: master
• Last Pushed: 2020-10-16T06:46:24.000Z (about 4 years ago)
• Last Synced: 2024-10-28T02:51:17.461Z (16 days ago)
• Language: JavaScript
• Homepage:
• Size: 11.7 KB
• Stars: 8
• Watchers: 3
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: readme.js
  • License: LICENSE

Awesome Lists containing this project

• awesome-callbags - map

README

        
/**

 * callbag-map

 * -----------

 *

 * Callbag operator that applies a transformation on data passing through it.

 * Works on either pullable or listenable sources.

 *

 * `npm install callbag-map`

 *

 * Example:

 *

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

 *     const iterate = require('callbag-iterate');

 *     const map = require('callbag-map');

 *

 *     const source = map(x => x * 0.1)(fromIter([10,20,30,40]));

 *

 *     iterate(x => console.log(x))(source); // 1

 *                                           // 2

 *                                           // 3

 *                                           // 4

 */

const map = f => source => (start, sink) => {

  if (start !== 0) return;

  source(0, (t, d) => {

    sink(t, t === 1 ? f(d) : d)

  });

};

module.exports = map;