shuffle list js

js

const getRandNum = (range) => Math.floor(Math.random() * range)

const shuffleList = (list) => {
  const len = list.length
  for (let i = 0; i < len; i++) {
    const idx = getRandNum(len - i)
    const last = len - i - 1
    const tmp = list[last]
    list[last] = list[idx]
    list[idx] = tmp
  }
  return list
}

const genList = (n) => {
  const list = []
  for (let i = 0; i < n; i++) {
    list[i] = i
  }
  return list
}

console.log(genList(100))
console.log(shuffleList(genList(100)))