tallbag-for-each v1.0.0

/**

• tallbag-for-each

• ---

• Tallbag sink that consume both pullable and listenable sources. When called
• on a pullable source, it will iterate through its data. When called on a
• listenable source, it will observe its data.
• npm install tallbag-for-each
• The first argument is the consumer of data,
• the second argument is the (optional) consumer of metadata from the shadow.
• Examples

• ---

• Consume a pullable source:

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

• const forEach = require('tallbag-for-each');

• const source = fromIter([10,20,30,40])

• forEach(x => console.log(x))(source); // 10

•                                       // 20

•                                       // 30

•                                       // 40

• Consume a listenable source:

• const interval = require('tallbag-interval');

• const forEach = require('tallbag-for-each');

• const source = interval(1000);

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

•                                       // 1

•                                       // 2

•                                       // 3

•                                       // ...

  */

const makeShadow = require('shadow-callbag').default;

const forEach = (operation, shadowOperation) => source => { let talkback; let shadow; source(0, (t, d, s) => { if (t === 0) { talkback = d; if (shadowOperation) { shadow = makeShadow('forEach', s); shadow(0, (_t, _d) => { if (_t === 0) _d(1); if (_t === 1) shadowOperation(_d); }); } } if (t === 1) { shadow && shadow(1, d); operation(d); } if (t === 1 || t === 0) talkback(1); }); };

module.exports = forEach;