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Svelte 5 has lifecycle hooks for on-mount and on-unmount lifecycle events. #313

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Svelte 5 has lifecycle hooks for on-mount and on-unmount lifecycle events. #313

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807c0a3
svelte has onMount() hook
programmerstevie Mar 18, 2026
3b595f6
Use onDestroy for component unmount
programmerstevie Mar 18, 2026
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4 changes: 3 additions & 1 deletion content/3-lifecycle/1-on-mount/svelte5/PageTitle.svelte
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
<script>
import { onMount } from 'svelte';

let pageTitle = $state("");
$effect(() => {
onMount(() => {
pageTitle = document.title;
});
</script>
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4 changes: 3 additions & 1 deletion content/3-lifecycle/2-on-unmount/svelte5/Time.svelte
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
<script>
import { onDestroy } from "svelte";

let time = $state(new Date().toLocaleTimeString());

$effect(() => {
onDestroy(() => {
const timer = setInterval(() => {
time = new Date().toLocaleTimeString();
}, 1000);
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