The least disliked ranking algorithm

least-disliked-rating.js

// The Dislike Total (DT) is calculated
// by totaling the below 'mean' differences.
// The lowest DT is the winner.

function calcLeastDisliked(multiArray) {
    const sum = array=>array.reduce((a,b)=>a + b, 0);
    const singleArray = [].concat(...multiArray);
    const avg = sum(singleArray) / singleArray.length;
    return multiArray.map(ratings=>{
        const belowAvgRatings = ratings.filter(x=>avg > x, ratings);
        const DT = avg * belowAvgRatings.length - sum(belowAvgRatings);
        console.log(ratings, DT);
        return DT;
    });
}

Why?

When people are voting on things, a popular vote usually ends up with a polarized outcome. Some people will really love it and others will hate it. This algorithm takes into account that we want the thing that is mostly okay with everybody.

Example

let ratings = [
    [7,6,7,9], // option 0 ratings
    [10,6,9,5], // option 1 ratings
    [3,5,5,3], // ...
    [5,8,5,9]
];
calcLeastDisliked(ratings);

returns [0.375, 1.75, 9.5, 2.75]
prints

[7, 6, 7, 9] 0.375
[10, 6, 9, 5] 1.75
[3, 5, 5, 3] 9.5
[5, 8, 5, 9] 2.75