russian name generator

nameGen.js

const CONSONANT = "бвгджзклмнпрстфхцчшщ"
const VOWEL = "еёаиэюяоу"

const isFirst = i => i == 0
const isEven = n => (n % 2) == 0

const rand = n =>
  Math.floor(Math.random() * n)

const randChar = string =>
  string.charAt(rand(string.length))

const genChar = (el, i) =>
  isEven(i)
    ? randChar(CONSONANT)
    : randChar(VOWEL)

const joinName = (state, cur, i) =>
  state + (
    isFirst(i)
      ? cur.toUpperCase()
      : cur
  )


const genName = (length = 5) =>
  Array.from({ length }, genChar)
    .reduce(joinName, [])


console.log(genName())