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svelte/documentation/tutorial/02-reactivity/04-updating-arrays-and-objects/app-a/App.svelte

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<script>
let numbers = [1, 2, 3, 4];
function addNumber() {
numbers.push(numbers.length + 1);
}
$: sum = numbers.reduce((t, n) => t + n, 0);
</script>
<p>{numbers.join(' + ')} = {sum}</p>
<button on:click={addNumber}> Add a number </button>