moy-fp/src/Math/median.js

A functional programming library.

import curry from '../Function/curry'
import add from './add'

/**
 * [Number] -> Number
 */
const median = curry(
  array => {
    const list = array.sort((a, b) => a - b),
          length = list.length
    return length === 0 ? NaN : length % 2 === 0 ? (list[length / 2] + list[length / 2 - 1]) / 2 : list[(length - 1) / 2]
  }
)

export default median