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flow-median

flow-median

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.

Installation

$ npm install flow-median

Examples

var 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 );

Tests

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.

License

MIT license.


Copyright

Copyright © 2014. Athan Reines.