JS基础测试63期

[zhangxinxu]

已知某团队小测数据结构如下：

const jsonQuiz = [{
"username": "张三",
"times": 24
}, {
"username": "李四",
"times": 1
}, {
"username": "王二",
"times": 6
}, {
"username": "麻子",
"times": 9
}];

请写一个名为 urLucky 的方法，此方法支持一个参数，为每次抽奖抽中的人员数量，人员的中奖概率按照 times 次数分配。

例如执行 urLucky(2)，张三、李四、王二、麻子中会有两人中奖，每人中奖概率分别是：60%，2.5%，15%，22.5%。

[OzpinS]

const jsonQuiz = [{
  "username": "张三",
  "times": 24
}, {
  "username": "李四",
  "times": 1
}, {
  "username": "王二",
  "times": 6
}, {
  "username": "麻子",
  "times": 9
}];

const getLuckyOne = (pool) => {
  pool.sort((a, b) => a.times - b.times)

  let weightSum = 0
  let times = pool.map(item => {
    weightSum += item.times
    return item.times
  })
  let weightsRandom = Math.random() * weightSum
  times.push(weightsRandom)
  times.sort((a, b) => a - b)
  return pool[times.indexOf(weightsRandom)] || pool[pool.length - 1]
}

const urLucky = (x = 1) => {
  let luckyMan = []
  x = x > jsonQuiz.length ? jsonQuiz.length : x
  for (let i = 0; i < x; i++) {
    const pool = jsonQuiz.filter(item => !luckyMan.includes(item))
    luckyMan.push(getLuckyOne(pool))
  }
  return luckyMan
}

console.log(urLucky(2))