generators.js

/*
	requires node version v0.11.2
	call this with `node --harmony thisFile.js`
*/

/* 
	calls 'cb' after some sleep
	time with a random value.
*/
var producer = function(cb ){

	setTimeout(function(){
		cb(false, Math.random());
	}, Math.random() * 1000);

};

/*
	generates the generator function 'gen'
	and provides the `next` function as helper
	to the generator
*/
function Helper( gen ){
	var a = gen( next );
	a.next();

	function next (err, value){
		a.send(value);
	};
};

/*
	lets test that shit 
*/
Helper(function*( next ){

	var x = yield producer( next );
	var y = yield producer( next );

	console.log(x, y);
});