How do I use watchers in Vue 3?

How do I use watchers in Vue 3?

In Vue 3, watchers are used to observe changes in data properties and perform actions in response. You can define a watcher using the watch function.

Can you give me an example of a watcher?

Sure! Here's a simple example:

import { ref, watch } from 'vue';

const count = ref(0);

watch(count, (newValue, oldValue) => {
  console.log(`Count changed from ${oldValue} to ${newValue}`);
});

What if I want to watch multiple properties?

You can watch multiple properties by passing an array to the watch function. For example:

watch([property1, property2], ([newProp1, newProp2], [oldProp1, oldProp2]) => {
  // Your logic here
});