100prisonersriddle.js

const getRandomizedBoxes = ()=>{
    const getRandomInt = (min,max)=>{
        min = Math.ceil(min);
        max = Math.floor(max);
        return Math.floor(Math.random() * (max - min) + min);
        //The maximum is exclusive and the minimum is inclusive
    }

    const boxes = Array(100);

    for (let i = 0; i < 100; i++) {
        let randInt;

        do {
            const randInt = getRandomInt(0, 100);
            if (boxes.indexOf(randInt) === -1)
                boxes[i] = randInt;
        } while (typeof boxes[i] !== 'number')
    }
    return boxes;
}
const runSimulation = ()=>{
    let solved = 0;

    const boxes = getRandomizedBoxes();

    for (let prisoner = 0; prisoner < 100; prisoner++) {
        let boxIndex = prisoner;
        for (let i = 0; i < 50; i++) {
            if (boxes[boxIndex] === prisoner) {
                solved++
                break;
            } else {
                boxIndex = boxes[boxIndex]
            }

        }

    }
    return solved;
}

let successful = 0;

for (let i = 0; i < 100000; i++) {
    successful += runSimulation() === 100 ? 1 : 0;
}
const ratio = successful / 100000;
console.log('Prisoners were freed on average', (ratio * 100) + '%', 'of the time')

Context https://www.youtube.com/watch?v=iSNsgj1OCLA