https://github.com/binocarlos/group-cascade-stream

A cascade stream that groups created streams by a chunk id
https://github.com/binocarlos/group-cascade-stream

Last synced: 10 days ago
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A cascade stream that groups created streams by a chunk id

• Host: GitHub
• URL: https://github.com/binocarlos/group-cascade-stream
• Owner: binocarlos
• License: mit
• Created: 2014-04-21T16:59:46.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-04-22T14:47:46.000Z (over 10 years ago)
• Last Synced: 2024-10-31T19:00:11.804Z (19 days ago)
• Language: JavaScript
• Size: 172 KB
• Stars: 1
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
group-cascade-stream

====================

[![NPM](https://nodei.co/npm/group-cascade-stream.png?global=true)](https://nodei.co/npm/group-cascade-stream/)

[![Travis](http://img.shields.io/travis/binocarlos/group-cascade-stream.svg?style=flat)](https://travis-ci.org/binocarlos/group-cascade-stream)

A cascade stream that groups created streams by a chunk id

## example

```js

var from = require('from2-array')

var through = require('through2')

var cascade = require('group-cascade-stream')

var coeffs = {

	a:2,

	b:5,

	c:10

}

// create a stream for a single letter

function createLetterStream(letter){

	var coeff = coeffs[letter]

	return through.obj(function(chunk, enc, cb){

		var num = parseFloat(chunk.replace(/\D/g, ''))

    this.push(num * coeff)

    cb()

	})

}

var source = from.obj(['a1', 'b3', 'a4', 'c3', 'c8', 'b5'])

var splitter = cascade(function(chunk){

	// return just 'a' for the id

	return chunk.toString().charAt(0)

}, function(id){

	return createLetterStream(id)

})

var sink = through.obj(function(chunk, enc, cb){

	console.log(chunk);

	cb()

})

source.pipe(splitter).pipe(sink)

/*

	2 		(a1 -> 1 * 2)

	15		(b3 -> 3 * 5)

	8			(a4 -> 4 * 2)

	30		(c3 -> 3 * 10)

	80		(c8 -> 8 * 10)

	25		(b5 -> 5 * 5)

*/

```

## license

MIT