flow-multiply v1.0.0

flow-multiply

Transform stream factory to perform scalar multiplication on streamed numeric data values.

Installation

$ npm install flow-multiply

API

To create a stream factory,

var multStream = require( 'flow-multiply' );

// Create a new factory:
var mStream = multStream();

mStream.scalar( value )

This method is a setter/getter. If no value is provided, returns the multiplication factor (a.k.a. the scalar); default is 1. To set the scalar,

mStream.scalar( 3 );

mStream.stream()

To create a new scalar multiplication stream,

var stream = mStream.stream();

Usage

Methods are chainable.

multStream()
	.scalar( 3 )
	.stream()
	.pipe( /* writable stream */ );

Examples

var eventStream = require( 'event-stream' ),
	mStream = require( 'flow-multiply' );

// Create some data...
var data = new Array( 1000 );
for ( var i = 0; i < data.length; i++ ) {
	data[ i ] = Math.round(Math.random()*10);
}

// Create a readable stream:
var readStream = eventStream.readArray( data );

// Create a new scalar multiplication stream:
var stream = mStream()
	.scalar( 3 )
	.stream();

// Pipe the data:
readStream.pipe( stream )
	.pipe( eventStream.map( function( d, clbk ) {
		clbk( null, d.toString()+'\n' );
	}))
	.pipe( process.stdout );

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit tests use the Mocha test framework with Chai assertions.

Assuming you have installed Mocha, execute the following command in the top-level application directory to run the tests:

$ mocha

All new feature development should have corresponding unit tests to validate correct functionality.

License

MIT license.

Copyright

Copyright © 2014. Athan Reines.