Do I have to clear setTimeouts after they've run?

Question

Simple question really, I'm running a bunch of timeouts but wanna make sure they don't slow the page down and that for some reason they aren't kept in memory after they've executed.

$projects.each(function(index) {
    var $this = $(this);
    window.setTimeout(function() {
        // animate
    }, 300 * index);
});
// Clear timeouts?

My guess is that they're destroyed once they've run but just want to follow best practice.

Answer 1

No, you don't. Interval timers (via "setInterval()"), yes, if you want them to stop.

It's harmless to clear a timeout that doesn't have to be cleared. That is, if you do clear one after it has run, browsers won't complain.