Challenge #1 of 2

Q:
It is said that `watchers` are our last resort in Vue: we should use them when no alternative method is present.

More specifically, when should watchers be used in Vue?

If we need to perform an asynchronous operation when the component loads, we should use watchers.

If we need to frequently listen to changes to data keys, a watcher is better.

If we need to listen to a prop change, or we need to perform an asynchronous operation as a result of some data change, we should use watchers.

We should never use watchers. They are deprecated!