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