Transform stream factory to perform scalar division on streamed numeric data values.
Note: this module is provided for semantic convenience. Its functionality is the same as flow-multiply
, where the scalar
(divisor) is simply its fractional equivalent; i.e., for scalar multiplication, scalar = 1/d
, where d
is the divisor.
$ npm install flow-divide
To create a stream factory,
var divStream = require( 'flow-divide' );
// Create a new factory:
var dStream = divStream();
This method is a setter/getter. If no value
is provided, returns the divisor
; default is 1
. To set the divisor
,
dStream.divisor( 10 );
To create a new scalar division stream,
var stream = dStream.stream();
Methods are chainable.
divStream()
.divisor( 10 )
.stream()
.pipe( /* writable stream */ );
var eventStream = require( 'event-stream' ),
dStream = require( 'flow-divide' );
// 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 division stream:
var stream = dStream()
.divisor( 10 )
.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
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.
Copyright © 2014. Athan Reines.