initial

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

@@ -0,0 +1,22 @@
+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>
+```