JSFiddle - React, Tailwind, and code Playground

JavaScript

function sortTogether(array1, array2) {
    var merged = [];
    for(var i=0; i<array1.length; i++) { merged.push({'a1': array1[i], 'a2': array2[i]}); }
    merged.sort(function(o1, o2) { return ((o1.a1 < o2.a1) ? -1 : ((o1.a1 == o2.a1) ? 0 : 1)); });
    for(var i=0; i<merged.length; i++) { array1[i] = merged[i].a1; array2[i] = merged[i].a2; }
}

var array1 = ['zzzzz', 'aaaaaa', 'ccccc'];
var array2 = [3, 7, 1];

console.log('Before..: ',array1,array2);
sortTogether(array1, array2);
console.log('After...: ',array1,array2);