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svelte/documentation/examples/01-reactivity/02-reactive-statements/App.svelte

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<script>
let count = 0;
$: if (count >= 10) {
alert(`count is dangerously high!`);
count = 9;
}
function handleClick() {
count += 1;
}
</script>
<button on:click={handleClick}>
Clicked {count}
{count === 1 ? 'time' : 'times'}
</button>