From apps to videos to who knows what's next ...

The browser provides extra help. When you use a timer, JavaScript hands that task to the browser. The browser handles the wait. Once the timer ends, the browser tells JavaScript to run the callback.

Accessing Data • index: Use [0] to get the first item. • at (): A modern way to get items. You can use negative numbers like -1 to get items from the end. This is safer than standard bracket notation ...