And it's better to make a semantically rich utility function.
/** @func sum up an arr of nums @param {number[]} a @return {number} */ export const sum = a => a.reduce((acc, n) => acc + n, 0); sum([1, 2, 3, 4, 5]); // 15
P.S. Although it might be tempting to extend the built-in Math namespace with a "Math.sum", that would be an antipattern to do so.
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And it's better to make a semantically rich utility function.
P.S.
Although it might be tempting to extend the built-in Math namespace with a "Math.sum", that would be an antipattern to do so.