Transform stream which calculates a sliding-window sum (moving-sum) over a numeric data stream.
$ npm install flow-msum
var eventStream = require('event-stream'),
sumStream = require('flow-msum');
// Create an array containing random numbers:
var randoms = new Array( 50 );
for (var i = 0; i < randoms.length; i++) {
randoms[i] = Math.round(Math.random() * 100);
}
// Create a readable stream from an array:
var randStream = eventStream.readArray(randoms);
// Create a new moving sum stream:
var myStream = sumStream()
.window( 7 )
.stream();
// Pipe the data:
randStream.pipe(myStream)
.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 globally 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. Rebekah Smith.