ranking.js

function makeRank(rank, listOfUserDensity, listOfUserRanks) {

    var rank = rank;
    var totalUserDensity = listOfUserDensity.reduce((a, b) => a + b, 0); // explanation: adding all values
    var totalUserRanks = listOfUserRanks.reduce((a, b) => a + b, 0); // explanation: adding all value
    var averageRank = totalUserRanks / totalUserDensity; // average rank of all users

    if (averageRank < 5) {
        rank += .5;
    }
    else if (averageRank >= 5 && averageRank < 8) {
        rank += .75;
    }
    else if (averageRank >= 8 && averageRank <= 10) {
        rank += 1;
    }
    return rank;
}