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Discussion on: What´s wrong with Array.reduce ?

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Functional Javascript

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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