var eventStream = require( 'event-stream' ),
    rStream = require( 'flow-reduce' );

// Create some data...
var data = new Array( 1000 );
for ( var i = 0; i < 1000; i++ ) {
    data[ i ] = Math.random();
}

// Create a readable stream:
var readStream = eventStream.readArray( data );

// Create a new reduce stream (counter):
var stream = rStream()
    .reduce( function( acc, d ){
        return acc+1;
    })
    .acc( 0 )
    .stream();

// Pipe the data:
readStream.pipe( stream )
    .pipe( eventStream.map( function( d, clbk ) {
        clbk( null, d.toString() );
    }))
    .pipe( process.stdout );