[reidjs]

Hah, I wrote one as well to prove it to myself in the chrome dev tools console

  const pickCar = (switchChoice) => {
    const doors = [0, 0, 0];
    doors[(Math.random() * doors.length - 1) | 0] = 1
 let pick = (Math.random() * doors.length - 1) | 0
 let goat
 for(let i = 0; i < doors.length; i++) { if (doors[i] == 0 && i != pick) goat = i  }
 let result = pick
 if (switchChoice) for(let i = 0; i < doors.length; i++) { if (i != pick && i != goat) result = i }
 return result 
  }
  let switchWins = 0;
  let switchLosses = 0;
  for(let i = 0; i < 100000; i++) {
   pickCar(true) == 1 ? switchWins++ : switchLosses++
  }
  console.log('wins:', switchWins, ', losses: ',switchLosses)