带Math.max的Javascript Array.reduce

const numbers = [ 1, 2, 3 ]

console.log('passing arrow funciton', numbers.reduce((l, r) => Math.max(l, r)) ) // 3

console.log('passing bound function', numbers.reduce(Math.max.bind(Math)) ) // NaN

const numbers = [1, 2, 3]

const reduce = (array, func) => {

  let largest = 0

  array.forEach
  (
    (number, i, a) =>
      a[i + 1]
      ? largest = func(number, a[i + 1])
      : console.log('done')
  )

  return largest

}

console.log( 'mock reduce', reduce(numbers, Math.max.bind(Math)) ) // 3