misc-utils-of-mine-generic/src/math.ts

Miscellaneous utilities for JavaScript/TypeScript that I often use

export const average = (arr: number[]) => arr.reduce((a, b) => a + b, 0) / arr.length;

export const median = (arr: number[]) => {
  const mid = Math.floor(arr.length / 2),
    nums = [...arr].sort((a, b) => a - b);
  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;
};