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svelte/documentation/examples/01-reactivity/01-reactive-declarations/App.svelte

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<script>
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let count = 1;
// the `$:` means 're-run whenever these values change'
$: doubled = count * 2;
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$: quadrupled = doubled * 2;
function handleClick() {
count += 1;
}
</script>
<button on:click={handleClick}>
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Count: {count}
</button>
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<p>{count} * 2 = {doubled}</p>
<p>{doubled} * 2 = {quadrupled}</p>