Reduce transform stream which calculates the sample variance over a stream of numeric data.
$ npm install flow-variancevar eventStream = require( 'event-stream' ),
vStream = require( 'flow-variance' );
// Create some data...
var data = new Array( 1000 );
for ( var i = 0; i < data.length; i++ ) {
data[ i ] = Math.random();
}
// Create a readable stream:
var readStream = eventStream.readArray( data );
// Create a new variance stream:
var stream = vStream().stream();
// Pipe the data:
readStream.pipe( stream )
.pipe( eventStream.map( function( d, clbk ){
clbk( null, d.toString() );
}))
.pipe( process.stdout );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:
$ mochaAll new feature development should have corresponding unit tests to validate correct functionality.
Copyright © 2014. Athan Reines.