toilet

toilet.js

function getRandomStartingSeatConfiguration() {
    var seatRandomMod = 2,
    seatRandomNum = Math.floor(Math.random()*seatRandomMod);

    if(seatRandomNum%seatRandomMod) {
        return 'up';
    } else {
        return 'down';
    }
}

function getRandomSex() {
    var sexRandomMod = 2,
    sexRandomNum = Math.floor(Math.random()*sexRandomMod);

    if(sexRandomNum%sexRandomMod) {
        return 'male';
    } else {
        return 'female';
    }
}

function getRandomWasteType() {
    var wasteRandomMod = 9,
        wasteRandomNum = Math.floor(Math.random()*wasteRandomMod);

    if(wasteRandomNum%wasteRandomMod == 8) {
        return 'poop';
    } else {
        return 'pee';
    }
}

function getWork(preference, sampleSize) {
    var work = 0,
        maleWork = 0,
        femaleWork = 0,
        seatConfiguration = getRandomStartingSeatConfiguration();

    for(var i=0; i<sampleSize; i++) {
        var sex = getRandomSex(),
            waste = getRandomWasteType();

        if(waste == 'poop' && seatConfiguration == 'up') {
            work++;
            seatConfiguration = 'down';

            if(sex == 'male') {
                maleWork++;
            } else {
                femaleWork++;
            }
        }

        if(waste == 'pee') {
            if(sex == 'male' && seatConfiguration == 'down') {
                if(preference == 'up') {
                    work++;
                    seatConfiguration = 'up';
                    maleWork++;
                } else if (preference == 'down') {
                    work += 2;
                    // seatConfiguration up, then down
                    maleWork += 2;
                }
            } else if ( sex == 'female' && seatConfiguration == 'up') {
                work++;
                seatConfiguration = 'down';
                femaleWork++;
            }
        }
    }

    return {
        workPct: Math.floor(work/sampleSize*100),
        femaleWorkPct: Math.floor(femaleWork/work*100),
        maleWorkPct: Math.floor(maleWork/work*100)
    };
}

var preferUpWork = getWork('up', 1000000),
    preferDnWork = getWork('down', 1000000);

console.log('up:'+JSON.stringify(preferUpWork), 'dn:'+JSON.stringify(preferDnWork));