20 lines
321 B
JavaScript
20 lines
321 B
JavaScript
function required(msg) {
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throw new Error(msg);
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}
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function sum(
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{ arr = required('arr is required') } = { arr: arr = [] },
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length = arr.length
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) {
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let i = 0;
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let acc = 0;
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for (let item of arr) {
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if (i >= length) return acc;
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acc += item;
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i++;
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}
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return acc;
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}
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expect(sum({arr:[1,2]})).toBe(3);
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