bingo-functional-js/src/Algorithms/Collection/max.js

A port of the PHP bingo-functional library

const fold = require('./fold')
const isUndefined = require('../Function/isUndefined')

/**
 * max function
 *
 * max :: [a] -> Int
 * @param {array} list
 * @returns {number}
 * @example
 *
 * max([8, 7, 13, 2])
 * // => 13
 */
const max = (list) => {
  const res = fold(
    (acc, val) => {
      let result = isUndefined(acc) ? 0 : acc
      result = val > result ? val : result

      return result
    },
    list,
    undefined,
  )

  return res
}

module.exports = max