https://github.com/franciscotln/callbag-reject

Callbag operator that rejects all source elements that satisfies a predicate
https://github.com/franciscotln/callbag-reject

Last synced: 18 days ago
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Callbag operator that rejects all source elements that satisfies a predicate

• Host: GitHub
• URL: https://github.com/franciscotln/callbag-reject
• Owner: franciscotln
• License: mit
• Created: 2018-03-18T22:27:06.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-03-18T22:28:32.000Z (over 6 years ago)
• Last Synced: 2024-09-15T01:48:24.173Z (about 2 months ago)
• Language: JavaScript
• Size: 3.91 KB
• Stars: 3
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.js
  • License: LICENSE

Awesome Lists containing this project

• awesome-callbags - reject

README

        
/**

 * callbag-reject

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

 *

 * Callbag operator that rejects all source items that satisfy a predicate function.

 * Works on either pullable or listenable sources.

 *

 * `npm install callbag-reject`

 *

 * Example:

 *

 *     const forEach = require('callbag-for-each');

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

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

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

 * 

 *     const isEven = n => n % 2 === 0;

 *

 *     pipe(

 *       fromIter([1, 2, 3, 4]),

 *       reject(isEven),

 *       forEach(console.log) // 1, 3

 *     );

 */

const reject = r => source => (start, sink) => {

  let ask;

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

    if (t === start) {

      ask = d;

    }

    if (t === 1) {

      try {

        r(d) ? ask(t) : sink(t, d);

      } catch (e) {

        sink(2, e);

      }

      return;

    }

    sink(t, d);

  });

};

module.exports = reject;