name.js

const readline = require("readline")

const seeds = [
  // 使いたい漢字を列挙する
]
const firstName = "" // 名字
const getRandomInt = (len) => {
  return Math.ceil(Math.random() * len)
}
const pick = (arr) => {
  return arr[getRandomInt(arr.length)]
}
// 2文字:1文字:3文字 = 2:1:1で出したい
const randomLength = () => {
  const num = getRandomInt(4)
  switch (num) {
    case 1:
      return 1
    case 3:
      return 3
    default:
      return 2
  }
}
const generateName = (seeds) => {
  return Array.from({ length: randomLength() })
    .map((_) => {
      return pick(seeds)
    })
    .join("")
}
const rl = readline.createInterface(process.stdin, process.stdout)

const main = () => {
  outputRandomName()
  rl.on("line", function(line) {
    outputRandomName()
  })
}

const outputRandomName = () => {
  for (let i = 0; i < 5; i++) {
    console.log(firstName, generateName(seeds))
  }
}

main()