What are watchers in Vue.js?

What are watchers in Vue.js?

Watchers in Vue.js are a way to observe and react to changes in data properties. They allow you to perform asynchronous operations or side effects when a specific data property changes.

How do I create a watcher in Vue.js?

You can create a watcher in Vue.js by defining a watch property in your component. For example:

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

Can I watch multiple properties at once?

Yes, you can watch multiple properties by defining multiple watcher functions in the watch object, each for the property you want to observe.

What are the performance implications of using watchers?

Using watchers can have performance implications if they trigger expensive operations. It's important to optimize the code inside watchers and consider using computed properties when possible.