Function average

packages/common/src/math.ts:8–18

(arr: (number | null)[], includeZero = false)

};

export const average = (arr: (number | null)[], includeZero = false) => {
  const filtered = arr.filter(
    (n): n is number =>
      isNumber(n) &&
      !Number.isNaN(n) &&
      Number.isFinite(n) &&
      (includeZero || n !== 0),
  );
  const avg = filtered.reduce((p, c) => p + c, 0) / filtered.length;
  return Number.isNaN(avg) ? 0 : avg;
};

export const sum = (arr: (number | null | undefined)[]): number =>
  round(arr.filter(isNumber).reduce((acc, item) => acc + item, 0));