Asynchronous JavaScript <-> Console Communication

example.js

var factory = function ( process )
{
	var currentReceiverFun = [];

	var receiverFun = function ( data )
	{
		if ( currentReceiverFun.length > 0 )
		{
			var fn = currentReceiverFun.unshift();
			fn( data );
		}
	};

	var sendLine = function ( data, fn )
	{
		currentReceiverFun.push( fn );
		process.stdin.write( data );
	};

	process.stdout.on( 'data', receiverFun );


	return sendLine;
};

// ---

var myHandler = factory();

myHandler(
	"Hallo, Welt!",
	function ( line )
	{
		console.log( "received " + line );
	}
);