1234567891011121314151617181920
import {mean} from './mean'
export function median(list) {  const len = list.length  if (len === 0) return NaN  const width = 2 - (len % 2)  const idx = (len - width) / 2
  return mean(    Array.prototype.slice      .call(list, 0)      .sort((a, b) => {        if (a === b) return 0
        return a < b ? -1 : 1      })      .slice(idx, idx + width)  )}