How do I use watchers in Vue's Options API?

How do I use watchers in Vue's Options API?

In Vue's Options API, you can use watchers to observe changes in data properties. You define a watcher in the 'watch' option of your component.

Can you give me an example of a watcher?

Sure! Here's a simple example:

watch: {
  myProperty(newValue, oldValue) {
    console.log('myProperty changed from', oldValue, 'to', newValue);
  }
}

What types of data can I watch?

You can watch any reactive data property, including data, computed properties, and even props.

Are there any performance considerations I should be aware of?

Yes, excessive watchers can impact performance. It's best to limit the number of watchers and ensure they are necessary.