delay.js

/*
 * Provides time-based promise-returning delay and schedule functions
 */
({define:typeof define!="undefined"?define:function(factory){module.exports=factory(require)}}).
define(function(require){
if (typeof system === "object" && system.engine === "rhino"){
	// for rhino
	return require("./engines/rhino/delay");
}
var defer = require("./promise").defer,
	LazyArray = require("./lazy-array").LazyArray;
// returns a promise that is fulfilled after the given number of milliseconds
function delay(ms){
	var deferred = defer();
	setTimeout(deferred.resolve, ms);
	return deferred.promise;
};
// returns a lazy array that iterates one every given number of milliseconds
delay.schedule = function(ms){
	var callbacks = [];
	setInterval(function(){
		callbacks.forEach(function(callback){
			if(callback()){
				callbacks.splice(callbacks.indexOf(callback), 1);
			}
		});
	}, ms);
	return LazyArray({
		some: function(callback){
			callbacks.push(callback);
		}
	});
};
return delay.delay = delay;
});