Watching for Changes

Snippet

The watch function allows you to perform side effects (like API calls or logging) in response to changes in a reactive data source.

snippet.js

javascript

import { watch } from 'vue';
 
watch(source, (newValue, oldValue) => {
  console.log('Value changed from', oldValue, 'to', newValue);
});

vue

Breakdown

watch(source, ...)

Specifies which variable or source the function should keep an eye on.

(newValue, oldValue) => { ... }

The function that runs whenever the source changes, providing both the current and previous values.

From your library