Reduce transform stream which returns the median value from a stream of numeric data.
Note: in order to calculate the median exactly, all data must be buffered into memory. As a result, this stream acts as a sink. Use caution when applying the transform to large datasets.
$ npm install flow-medianvar eventStream = require( 'event-stream' ),
mStream = require( 'flow-median' );
// Create some data...
var data = new Array( 1000 );
for ( var i = 0; i < data.length; i++ ) {
data[ i ] = Math.round( Math.random() * 100 );
}
// Create a readable stream:
var readStream = eventStream.readArray( data );
// Create a new median stream:
var stream = mStream().stream();
// Create a pipeline:
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.