15 lines
395 B
JavaScript
15 lines
395 B
JavaScript
const sumAll = function (first, last) {
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if (first < 0) { return 'ERROR' }
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if (typeof first !== 'number' || typeof last !== 'number') { return 'ERROR' }
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first = Number(first);
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last = Number(last);
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let arr = [first,last].sort();
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let sum = 0;
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for (arr[0]; arr[0] <= arr[1]; arr[0]++) {
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sum = Number(sum) + arr[0]
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}
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return sum;
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}
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module.exports = sumAll
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