joplin-notes/joplin notion extension/Web Development/React/svelte/extras.md

extras

about effect rune

<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>