joplin-notes/joplin notion extension/Web Development/React/svelte/extras.md
2026-11-04 00:33:23 +05:30

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extras
about effect rune
```js
<script>
let count = $state(0);
let doubled = $derived(count * 2);
let triggerValue = $state('initial');
// This runs whenever any reactive value used inside changes
$effect(() => {
console.log('Effect ran:', count, doubled);
});
// This will only run when triggerValue changes
$effect(() => {
console.log('Triggered effect:', triggerValue);
// You can use other values here, but it won't re-run when they change
}).with(triggerValue);
</script>
```