Geothmetic Meandian comparing with others (implementation `gmdn` in JavaScript)

means.js

const means= (()=>{
    return { gmdn, median, meanArithmetic, meanGeometric };

    /* See
     * https://xkcd.com/2435/
     * https://www.explainxkcd.com/wiki/index.php/2435:_Geothmetic_Meandian
     * For sure, this is a joke!
     * Stats tip: If you aren't sure whether to use the mean, median,
     * or geometric mean, just calculate all three, then repeat until it converges 
     */
    function gmdn(vector, max_iterations= 10, precision= 0.00000001, l= vector.length){
        if(l<2) return vector[0];
        vector= gmdnNth(vector, l);
        while(--max_iterations&&!isDiagonal(vector, precision))
            vector= gmdnNth(vector, 3);
        return vector[0];
    }
    /* eg. [ x, x, x ] */
    function isDiagonal(vector, precision){
        const { abs, min, max }= Math;
        return abs(max(...vector)-min(...vector)) <= precision;
    }
    function gmdnNth(vector, l= vector.length){
        return [ meanArithmetic(vector, l), meanGeometric(vector, l), median(vector, l) ];
    }
    function median(vector, l= vector.length){
        if(l<2) return vector[0];
        const vector_sorted= [...vector].sort();
        if(l%2) return vector_sorted[(l-1)/2];
        const quotient= l/2;
        return (vector_sorted[quotient-1]+vector_sorted[quotient])/2;
    }
    function meanGeometric(vector, l= vector.length){
        if(l<2) return vector[0];
        return Math.pow(vector.reduce((acc, v)=> acc*v), 1/l);
    }
    function meanArithmetic(vector, l= vector.length){
        if(l<2) return vector[0];
        return vector.reduce((acc, v)=> acc+v, 0)/l;
    }
})();