setTimeout()

setInterval()

window.setInterval(function(), 1000);
window.clearInterval();

 // Scroll to the bottom of the page
 window.scrollTo(0, document.body.scrollHeight);
 window.setTimeout(function, milliseconds);

// .charAt()
"hello".charAt(0); // => "h"

// .slice()
"hello".slice(2); // => "llo"
"hello".slice(-2); // => "lo"