monty-hall.js

function shuffleArray(arr) {
  for (let i = arr.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [arr[i], arr[j]] = [arr[j], arr[i]];
  }
}

const montyHall = (n) => {
  let wins = 0;
  let doors = ["goat", "goat", "car"];
  let choice = [0, 1, 2];
  for (let index = 0; index < n; index++) {
    shuffleArray(doors);
    shuffleArray(choice);
    if (doors[choice[0]] != "car") {
      wins++;
    }
  }
  return wins;
};

let countWinArr = [];
for (let i = 0; i < 1000; i++) {
  countWinArr[i] = montyHall(100);
}
const arrMin = (arr) => Math.min(...arr);
const arrMax = (arr) => Math.max(...arr);
const arrAvg = (arr) => arr.reduce((a, b) => a + b, 0) / arr.length;
const arrMed = (arr) => {
  const mid = Math.floor(arr.length / 2),
    nums = [...arr].sort((a, b) => a - b);
  return arr.length % 2 !== 0 ? nums[mid] : (nums[mid - 1] + nums[mid]) / 2;
};

const countWinArrMin = arrMin(countWinArr);
const countWinArrMax = arrMax(countWinArr);
const countWinArrAvg = arrAvg(countWinArr);
const countWinArrMed = arrMed(countWinArr);

console.log({ countWinArrMin, countWinArrMax, countWinArrAvg, countWinArrMed, countWinArr });