JSFiddle - React, Tailwind, and code Playground

HTML

<div id="res"> </div>

JavaScript

prenoms = Array('alex','jean','paul','pierre','jacques','henri');
noms = Array('toto','titi','tata','tutu','tita','totu');
classement = Array('5A','4D','5A','3B','2C','3A');

sortarray=new Array();

cl=-1
while(classement[++cl]){
    sortarray[cl]=new Array(classement[cl]+prenoms[cl],prenoms[cl],noms[cl])
}


var clsort= function (a,b){
        return  (a[0]>b[0])?1:-1;
}

sortarray.sort(clsort);
res='';
i=-1
while(sortarray[++i]){
    res+=i+" => "+sortarray[i][1]+" "+sortarray[i][2].toUpperCase()+'<br/>';
}
document.getElementById('res').innerHTML=res