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svelte/site/content/tutorial/02-reactivity/02-reactive-declarations/app-b/App.svelte

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<script>
let count = 0;
$: doubled = count * 2;
function handleClick() {
count += 1;
}
</script>
<button on:click={handleClick}>
Clicked {count} {count === 1 ? 'time' : 'times'}
</button>
<p>{count} doubled is {doubled}</p>