Reduce transform stream which calculates the sample variance over a stream of numeric data.
$ npm install flow-variancevareventStream=require('event-stream'),vStream=require('flow-variance');// Create some data...vardata=newArray(1000);for(vari=0;i<data.length;i++){data[i]=Math.random();}// Create a readable stream:varreadStream=eventStream.readArray(data);// Create a new variance stream:varstream=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.