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svelte/documentation/tutorial/04-logic/01-if-blocks/app-b/App.svelte

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<script>
let user = { loggedIn: false };
function toggle() {
user.loggedIn = !user.loggedIn;
}
</script>
{#if user.loggedIn}
<button on:click={toggle}> Log out </button>
{/if}
{#if !user.loggedIn}
<button on:click={toggle}> Log in </button>
{/if}