instaInterval.js

//Or, if you don't want messy code every time, just define an instaInterval function
function instaInterval(f, t) {
	return (function() {
		f();
		return setInterval(f, t);
	});
}

//And now create executable intervals on the fly
var interval = instaInterval(function() {
	console.log("This is possible the best version of setInterval");
}, 5000)